CBSE Pathshala

Endocrine glands in simple terms class 10 science

noreply@blogger.com (J.Sunil Sir) — Sat, 09 Sep 2023 07:20:00 +0000

let's break down the location and functions of endocrine glands in simple terms:

1. Pituitary Gland: It's like the boss of all glands. Located in your brain, it controls many other glands and growth.

2. Thyroid Gland: This is in your neck. Think of it as your body's thermostat. It regulates metabolism and energy.

3. Adrenal Glands: They sit on top of your kidneys. Imagine them as stress managers. They release hormones for stress response.

4. Pancreas: It's in your abdomen. It's like a sugar regulator, producing insulin to control blood sugar.

5. Ovaries (in females) and Testes (in males): These are responsible for reproduction and secondary sex characteristics.

6. Pineal Gland: Deep in your brain, it's like your sleep manager, producing melatonin for sleep-wake cycles.

7. Hypothalamus: Also in the brain, it talks to the pituitary gland and helps control hunger, thirst, and body temperature.

Remember, these glands release hormones that act as messengers in your body, controlling various functions.

Here are the locations and the hormones released by the mentioned glands:

1. Pituitary Gland: Located in the brain.

- Hormones: Growth Hormone (GH), Prolactin, Thyroid-Stimulating Hormone (TSH), Adrenocorticotropic Hormone (ACTH), and more.

2. Thyroid Gland: Located in the neck.

- Hormones: Thyroxine (T4) and Triiodothyronine (T3) that regulate metabolism.

3. Adrenal Glands: Sit on top of the kidneys.

- Hormones: Cortisol (for stress response), Epinephrine (adrenaline), and Aldosterone (regulates salt and water balance).

4. Pancreas: Located in the abdomen.

- Hormones: Insulin (regulates blood sugar by lowering it) and Glucagon (raises blood sugar).

5. Ovaries (in females) and Testes (in males):

- Ovaries produce Estrogen and Progesterone (female sex hormones).

- Testes produce Testosterone (male sex hormone).

6. Pineal Gland: Deep in the brain.

- Hormone: Melatonin (regulates sleep-wake cycles).

7. Hypothalamus: Also in the brain.

- It controls the release of hormones from the pituitary gland and produces hormones like Oxytocin and Antidiuretic Hormone (ADH).

These hormones play crucial roles in regulating various bodily functions, ensuring your body works properly.

You may now understand

🎈List of endocrine glands and their hormones and function

🎈Endocrine glands table For Class 10

🎈Endocrine System Class 10 PDF

🎈Exocrine glands Class 10

🎈Name the endocrine glands

🎈Pituitary gland

🎈Classification of endocrine glands

🎈Endocrine system notes PDF

Q. A boy runs on seeing a stray dog. His breathing becomes very fast and blood pressure also increases. Name the

hormone found to be high in his blood and the gland which produces it.

Ans. Adrenaline, Adrenal gland.

Q.Name the diseases by which a person is likely to suffer due to the deficiency of (a) Iodine (b) Insulin

Ans. (a) Goitre (b) Diabetes

Q.How does our body maintain blood sugar level?

Ans. If sugar levels in blood rises, cells of pancreas detect and secrete more insulin which leads to fall off sugar level.

Q.Name the hormone responsible for the regulation of

(i) metabolism of carbohydrates, fats and proteins,

(ii) balance of calcium and phosphate,

(iii) blood pressure,

(iv) water and electrolyte balance.

Ans. (i) Thyroxine

(ii) Parathormone

(iii) Adrenaline

(iv) Vasopressin or ADH (Antidiuretic hormone)

Q.Explain with the help of an example how the timing and amount of hormone released are regulated?

Ans. The timing and amount of hormone released are regulated by feedback mechanisms. For e.g. when there is rise

in sugar level in blood, insulin secreted by pancreas. If sugar lavel in blood fall , insulin secretion is reduced.

Q.Name the hormone that is secreted by our body to deal with scary situations. List any two responses shown by our

body when this hormone is secreted into the blood.

Ans. Adrenaline.

Two responses :

(i) It acts on heart due to which heart beasts faster, resulting in supply of more oxygen to our wooden.

(ii) The breathing rate increases because of the contractions of the diaphragm and the rib muscles

(iii)The blood to the digestive system and skin is reduced due to contraction of muscles around small arteries in these

organs.

Class 10 Control and coordination solved science questions and answers

Class 09 Animal Tissue Quiz II CBSE Biology II

noreply@blogger.com (J.Sunil Sir) — Mon, 05 Jul 2021 06:12:00 +0000

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Diversity in Living Organisms class 9 solved Questions for CBSE exam

noreply@blogger.com (J.Sunil Sir) — Wed, 11 Dec 2019 15:59:00 +0000

Trend Setter Questions with Solutions : Diversity in Living Organisms more than 150 solved Questions

One Mark Questions:

1) What is biological classification ?

Ans: Grouping of organisms based on similarities & dissimilarities is called biological classification.

2) What is Taxonomy ?

Ans: The systematic study of identification classification and naming of oraganisms is called taxonomy.

3) Who made 1st attempt for scientific basis of classification ?

Ans : Aristotle.

4) On what morphological criteria Aristotle classified the plants ?

Ans : Based on the morphological nature of the stem.

5) Based on the nature of the steam name the types of plants classified by Aristotle.

Ans: Herbs, Shrubs & Trees.

6) Name the 2 kingdoms of classification ?

Ans: (1) Plantae & Metaphyta (2) Animatia Metazoa

7) What are prokaryotas ?

Ans: The organisms which do not have well organized nucleus in their cell are called prokaryotes.

OR

Organisms containing Incipient nucleus (Nucleoid) in their cells are called prokaryotes.

8) Give one example for prokaryote ?

Ans: Bacteria, Nostoc (cyano bacteria/ B.G. Algae)

9) What are Eukaryotes ?

Ans: Organisms which have well organized nuclei (True nuclear) are called Eukaryotes.

10) Give an example for Eukaryotes ?

Ans: Amoeba, mango, Man.

11) What are Unicellular organisms ?

Ans: One called or Single called organisms are called unicellular organisms.

12) Give an example for unicellular organisms ?

Ans: Chlamydomonas, Amoeba, Euglena.

13) What are Multi cellular organisms ?

Ans: Organisms whose body is made up of many numbers of cells are called multi cellular organisms.

14) Give an example for multi cellular organisms.

Ans: Spirogyra, Mango, Man.

[15) Name the five kingdoms of living organisms ?

Ans: (1) Kingdom monera, (2) Kindom Protista, (3) Kindom – Fungi (mycota) (4) Kindom – plautae (metaphyta). (5) Kindom – Animalia (metazoan).]

15) Who proposed five kingdom classification ?

Ans: R.H. Whittaker (1969)

16) What are Monerans ?

Ans: Prokaryotic cell natured organisms are called monerans.

17) Name the kingdom which includes monerans ?

Ans: Kingdom Monera.

18) Give an example for kingdom morera.

Ans: Bacteria, Nostoc, Mycoplasma.

19) Name the kingdom which includes Bacteria.

Ans: Kindom Monera. .

20) What are autotophic bacteria ?

Ans: The bacteria which synthesize their own food from triorganic substrates are called autotophic bacteria.

21) Give an example for autotrophic bacteria.

Ans: Nostoc, Anabaena.

22) What are heterotrophic bacteria ?

Ans: The bacteria which do not synthesize their own food but depend on other organisms or dead organic matter are called heterotrophic bacteria.

23) Why archea bacteria can also live in extreme conditions?

Ans: Archea Bacteria are having different cell walls structure responding survival in extreme conditions.

24) What are halophiles ?

Ans: The archea bacteria which live in extreme salty areas are called halophiles.

25) What are thermoacidophiles ?

Ans: The archea bacteria which live in hot springs are called thermoacidophiles.

26) What are methanogens ?

Ans: The archea bacteria which live in marshy areas are called methanogens.

27) Where does methanogens live ?

Ans: In the gut of several ruminant animals (cows & buffaloes)

28) Name the gas produced by methanogens.

Ans: Methane (biogas)

29) Name the gas produced by dung of cows & buffaloes with the help of methanogens ?

Ans: Methane.

30) What are Eubacteria ?

Ans: True bacteria with rigid cell wall are called Eubacteria.

31) What are cyano bacteria ?

Ans: Blue, green, orange are called cyano bacteria.

32) Give an example for cyanobacteria.

Ans: Nostoc.

33) What are heterocysts ?

Ans: The colourless specialized cells of nostoc filament meant for fixing atmospheric nitrogen are called heterocysts.

34) What are chemosynthetic autotrophic bacteria ?

Ans: The bacteria which oxidize inorganic substances like nitrate, Nitrities & ammonia to release energy in the form of ATP are called chemosynthetic bacteria.

35) What are mycoplasmas ?

Ans: The smallest living organisms without cell walls & survive without oxygen are called mycoplasmas.

36) Name the kingdom which includes single celled eukaryotes?

Ans: Kingdom Protista.

37) What are protistans ?

Ans: Single celled eukaryotes are called protistants.

38) Name the 2 methods of protisan’s reproduction.

(1) A sexual reproduction (cell fusion)

(2) Sexual reproduction (Zygote formation)

39) What are planktons ?

Ans: The microscopic organisms which floats on water are called planktons.

40) Name the chemical component of cell wall of chrysopytes (Diatoms)

Ans: Chitin

41) The walls of chrysophytes (diatoms) are indestructible. Why ?

Ans: Because of the presence of chitin in their walls.

42) What is diatomaceous earth ?

Ans: Acumination of cell wall deposition of dead diatoms.

43) Which are chief producer of oceans ?

Ans: Diatoms.

44) Give an example for red dianoflagelletes ?

Ans: Gonyaulax

45) Which organisms make the sea water red ?

Ans: Dianoflagelletes.

46) What are dianoflaellates ?

Ans : Marine, Photosynthetic organisms with 2 flogella are called diamoflagellates.

47) What are engleuoids ?

Ans: The fresh water organisms found in stagnant water with protein rich pothicle in their cell wall are called enlenoids.

48) Give an example for englenoids.

Ans: Euglena (photosynthetic protozoan)

49) What are slime moulds ?

Ans: Saprophytic protists are called Slime moulds.

50) What are plasmodium ?

Ans: Aggregation of slime moulds under suitable conditions are called plasmodium, which may grow and spread over several feet. During unfavorable can they differentiate & follows fruiting bodies.

51) What are psendopodia ? (flase feet)

Ans: Locomotor organs of amoebia are called psendopodia.

52) Name parasitc protozoa.

Ans: Entamoeba, Plasmodium (Malorial parasite)

53) Give an example for flagellated protozoans.

Ans : Trubanosoma, Euglena.

54) Name parasitic flagellated protozoan.

Ans: Trypanosoma.

55) Name the disease caused by Trypanosoma.

Ans: Sleeping sickness.

56) Which is the locomotor organ of flagellated protozoa (or Trypanosoma or Euglena)

Ans: Flagella.

57) Give one example for ciliated protozoans.

Ans: Paramaecium.

58) Which is the locomotor organ of paramecium or ciliated protozoans.

Ans: Cilia.

59) Ciliated protozoans are actively moving organisms, why ?

Ans: Because of the presence of thousands of cilia.

60) Give one example for sporozoan. ?

Ans: Plasmodium

61) Which one is called material parasite ?

Ans: Plasmodium.

62) Name the disease caused y plasmodium ?

Ans: Malaria.

63) Name the kingdom which includes eukaryotic heterotrophic organisms?

Ans: Kingdom Mycota (Fungi)

64) Name unicellular Fungi.

Ans: Yeast.

65) Name the fungi used in the preparation of broad and beer ?

Ans: Yeast.

66) Which fungi art as a source of antibiotics ?

Ans: Penicillium.

67) Name the disease caused by puccinia ?

Ans: Wheat rust disease.

68) We should keep fruits & vegetables in refrigerator, why ?

Ans: to prevent food form going bad due to bacterial or fungal infections.

69) What are hyphae ?

Ans: Long slender thread like structure of fungi are called hyphae.

70) Name non filamentous fungi

Ans: Yeast (It is unicellular)

71) What are coenocytic hyphae?

Ans : Continuous tube like hyphae filled with multinucleated hyphae are called cocnocytic hyphae.

72) Name the cell wall component of fungi ?

Ans: Chitin and polysaccharides.

73) What are saprophytic fungi ?

Ans: The heterotrophic fungi which absorb soluble organic matter from dead substrates are called saprophytes.

74) What are parasitic fungi ?

Ans: The heterotrophic fungi which absorb food from living plants and animals are called parasitic fungi.

75) What are symbionts ?

Ans: The association of 2 organisms in which both the organisms (pastneri are mutually benefited are called symbionts. Ex: Fungi with algae as lichens.

76) Name the organisms of lichens ?

Ans: Fungi & Algae.

77) What are mycorshiza ?

Ans: Fungi in association with roots are called mycorrhiza.

78) Name A sexual method of reproduction in fungi ?

Ans: By producing spores called conidia or sporangia spores or

79) Name sexual method of reproduction of fungi ?

Ans: By producing Oospores, Osco spores, & basidiospores.

80) What are fruiting bodies ?

Ans: Spores producing structures in fungi are called fruiting bodies.

81) What is plasmogamy ?

Ans: Fusion of protoplasm of 2 motile or non motile gametes.

82) What is Karyogamy ?

Ans: Fusion of 2 nuclei is called karyogamy.

83) What are haploid spores ?

Ans: The spores produced through meiosis is zygote are called haploid spores

84) What is dikaryon ?

Ans: Fungal cell with 2 nuclei is called dikaryon.

85) What is mycelium ?

Ans : The plant body of fungi is called mycelium. It is made up of aggregation of hyphae.

86) What is the nature of mycelium of phycomycetes ?

Ans: Aseptate and Coenocytes

87) Name asexual method of reproduction in phycomycetes ?

Ans: By formation of Zoospores (motile) & by aplanospores (non motile)

88) Name 2 types of spores produced by phycomycetes ?

Ans: (1) Zoospores (motile) (2) Aplanospores (non motile)

90) What is zygospore ?

Ans: The spore formed by the fusion of 2 gametes is called zygospore.

91) What are isogamous gameter ?

Ans: Morphologically similar gameter are called isogamous gametes.

92) Give example for phycomycetes ?

Ans : Mirror, (2) Rhizopus (bread mould) (3) Albugo (parasitic fungi on mustara)

93) Name the parasitic fungi on mustard ?

Ans : Albugo

94) Give an example for unicellular Ascomycetes ?

Ans : Yeast (saccharomyces)

95) Give an example for multicellular Assocmycetes ?

Ans: Pencillium

96) What are condiospores ?

Ans : A sexual conidia produced exogenously on the special mycolinies called conidiospores.

97) Give an example for Ascomycetes ?

Ans: Aspergillus, Claviceps, Neurosporea.

98) What is the importance of Neureospora ?

Ans: It is extensively used in bio chemical & genetic work.

99) Name edible ascomycetes ?

Ans : Morels & buffles are echible & are considered as delicacies.

100) Give an example for Basidiomycetes ?

Ans: Mushrooms (2) bracket fungi (puff balls)

101) Name the most common vegetative method of reproduction in basidomycetes.

Ans: Fragmentation.

102) What are basidiocarps ?

Ans: Fruiting bodies of basidiomycetes are called basidocarps.

103) How many basidiospores are produced per basidium ?

Ans : Four Basidiospores.

104) Give an example for basidomycetes ?

Ans: Agericus (mushroom) (2) Ustilago (smut) (3) Paccinia (rust fungus)

105) Deuteromycetes are called imperfect fungi, why ?

Ans: Because in deuteromycetes we know only a sexual or vegetative phase of reproduction.

106) What are conidia ?

Ans: A sexual spores of deuteromycetes are called conidia.

107) What is the nature of mycelium in basidiomycetes and deuteromycetes?

Ans: Separate and branched.

108) Write the importance of deuteromycetes.

Ans: (1) helps in decomposition of litter. (2) helps in mineral cycling.

109) Give an example for deuteromycetes.

Ans: (1) alternaria (2) colletotricheism (3) Trichoderma.

110) Give an example for insectivorous plants or parasitic plants.

Ans: Bladder work (2) Venus fly trap (3) Cuscuta.

111) What is the cell wall component of plants.

Ans : Cellulose.

112) What are the 2 distinct phases of life cycles of plants.

Ans: (1) Naploid gametophytic generation. (2) Diploid sporophytic generation.

113) What is alternation of generation ?

Ans: The alternate occurrence of both haploid and diploid sporophytic generation in the life cycle of plants is called alternation of generation.

114) Name the kingdom which includes heterotrophic eukaryotic muscellular organisms which lack cell walls?

Ans: Kingdom animalia.

115) Which is the reserve food materials of animals ?

Ans: Glyrogen of fat

116) What is the mode of nutrition in animals ?

Ans: Holozoic (by ingestion of food)

117) Name the major type of reproduction ?

Ans: By copulation of male and female followed by embryological development.

118) Name the organisms which are not included in five kingdom?

Ans: classification of whittaker.

119) What is meant by virus ?

Ans: Virus means venom or poisonous fluid.

120 ) Who coined the term virus ?

Ans: Louis parteur

121) Who discovered mosaic diseases of tobacco ?

Ans: D.J. Ivanowsky

122) Who called viruses as “contagium virus fluidum ?

Ans : M.W. Beijerinek.

123) Viruses are called “contagium vivim fluidum” why ?

Ans: Because the extract of the infested plants of tobacco could cause infection in healthy plants.

124) Who filtered viruses for the first time ?

Ans: W.M. Stanley.

125) What is the component of crystals of viruses ?

Ans: Largely proteins (a/c to W.M. Stanley)

126) Name the genetic material of viruses ?

Ans : Either DNA or RNA never both.

127) What is the type of genetic material in plant viruses ?

Ans: Single stranded R.N.A

128) What is the type of genetic material in animal viruses ?

Ans: Either single or double stranded RNA or double stranded.

129) What are bacteriophages ? (double stranded DNA viruses)

Ans: The viruses that infect the bacteria are called bacteriophages.

130) What is the type of genetic material in bacteriophages ?

Ans: Double stranded D.N.A.

131) What is capsid ?

Ans: The protein coat viruses is called capsid.

132) What are capsomeres ?

Ans: Sub units of protein coat capsid are called capsomeres.

133) Give an example for obligate parasites ?

Ans: Viruses.

134) Why viruses are called obligate parasites ?

Ans: Because viruses can live inside or outside the body of host cell.

135) Name any two diseases.

Ans: (1) Mumps (2) Small pox (3) Herpes (4) Influenza (4) AIDS.

136) What are viroids ?

Ans: Infections R.N.A particles smaller than viruses protein coat are

viroids.

137) Who discovered viroids ?

Ans: T.O. Diener

138) Name the disease caused by viroids ?

Ans : Potato spindle tuber disease.

139) What are lichens ?

Ans: Symbiotic associations (mutually useful association) b/n algae and fungi are called lichens.

140) What is phycobiont ?

Ans: The algal component of lichen is called phycobiont. It is autotrophic.

141) What is mycobiont ?

Ans: The fungal component of lichen is called mycobiont. It is heterotrophic.

142) Name autotrophic and heterotrophic component of lichens ?

Ans: Algal component is autotrophic

Fungal component is heterotrophic.

143) What is the role of algae & fungi in lichens ?

Ans: Algae prepare food for fungi & fungi provide shelter and absorb mineral nutrients & water for algae.

144) Which organisms are called pollution indicators ?

Ans: Lichens.

145) Lichens are called pollution indicator, why ?

Ans : Because they do not grow in polluted areas.

146) What are the two component of viruses ?

Ans : (1) Genetic material either DNA or RNA. (2) Protein coat.

TWO MARKS QUESTIONS
1) Name the 5 kingdoms of living organisms ?

Ans: 1) Monera 2) Protista 3) Fungi (mycota) 4) Plantae (Metaphyto) 5)Animalia (Metazoa).

2) Mention the main criteria of R.H. Whittaker’s classification ?

Ans: 1) Cell structure 2) Thallus organization 3) Mode of nutrition 4)Reproduction 5) Phlogenetic relationships were considered by Whittaker.

3) Where does bacteria live ?

Ans: Bacteria are live in extreme habitats such as (1) hot springs (2) deep oceans (3) Snow (4) Deserts (5) as parasites on other organisms.

4) Based on the shape classify the bacteria ?

Ans: (1) The coccus (spherical) (2) Vibrium (comma shape ) (3)The bacillur (rod shaped) (4) Spirillum (spiral)

5) What are the 2 kinds of autotrophic bacteria ?

Ans: (1) Photosynthetic autotrophic bacteria (2) Chemosynthetic autotrophic bacteria.

6) What are arche bacteria ?

Ans: The special type of bacteria which live in most harsh (adverse) habitats such as extreme salty areas, hot springs & marshy areas are called arche bacteria.

7) List out any 4 properties of cyano bacteria ?

Ans: 1) Cells are prokaryotic in nature.

2) They are unicellular, colonial or filamentous.

3) They are either fresh water or marine water or terrestrial B.G.A

4) The colonies are surrounded by gelatinous mucilaginous sheath.

8) What is the role played by chemosynthetic bacteria ?

Ans: Recycling nutrients like Nitrogen Phosphorus, Iron & Sulphur.

9) Mention the methods of reproduction in bacteria ?

Ans: 1) Finsion 2) by spore formation 3) Transduction (by mutual

DNA transfer) (sexual reproduction)

10) Which kind of eukaryotic protists are included in monera ?

Ans: All single celled eukaryotes are placed under protista.

11) Name the different group of organisms included in monera ?

Ans: Chryosophytes, Dinoflugellates, Euglenoids, Scime molds and Protoazoans are the group of organisms included in monera.

12) Write the two characteristic features of kingdom protista ?

Ans:

1) All are single celled eukaryotes.

2) It includes plant protists (photosynthetic protozoan) & animal protozoan’s (protista)

3) Protist members are primarily orgnatic in nature & some are parmitic ?

4) The kingdom protista liks with other plants, fungi & animals.

5) Some protistam numbers have fiagella or cilia as cocomotary organs.

6) Protists reproduce asexually by binary fission and sexually by a process involving cell fusion & Zygote ferment ion.

13) Mention the two important characters of Chryesophytes ?

Ans: (1) Chryesophytes are the protistan unicellular eukaryotic protists.

(2) This game includes the diatoms & Elesmicls which are called “golden algae” (Jewels of the plant kingdom).

14) (How do you) Give the outline classification of bacteria.

15) Write the outline classification of kingdom protista.

16) What are parasites ? Name two protozisum parasites you have studied.

Ans: The organisms which depend on the other host organism for their requirement of food are called parasites.

Examples : (1) Plasmodium (2) Trypanosome.

17) Name the flagellated protozoan & ciliated protozoan ?

Ans: (1) flagellated protozoan Ex: Euglena.

(2) ciliated protozoan Ex: Paramecium.

18) What are symbionts ? Give an example

Ans: The close association of two different organisms living together where both are benefited for thin equipments are called symbionts.

19) What are the 3 steps involved in the life cycle of fungi ?

Ans: (1) Plasmogamy (2) Karyogany (3) meiosis in bygote.

20) Name the examples of phycomycetes ?

Ans: (1) Mucor (2) Rhizopues (3) Albugo.

22) Name the fungi belongs to ascomuscetes ? which are of them is used in biochemical & genetic work ?

Ans: (1) Aspergillus (2) Clavicles (3) Neurospora.

23) Name the fungi belongs to basidiomycetes ?

Ans: (1) Agaricus (mushroom) (2) Ustilago (Smurt) (3)Pucccinics (rust fungus)

24) Name the examples of denteromycetes ?

Ans: (1) Alternaria (2) Colletotrichum (3) Tricho derma.

25) Write briefly about lichens?

Ans: (1) Lichens are symbiotic close association of two different organisms such as algae & fungi.

(2) Algal component of lichen known as phycobiant which is photosynthetic in nature.

(3) Fungal component of living is known as mycobiont which is non photosynthetic, but helps in absorption of minerals, nutrients & water.

(4) Lichens are very good pollution inchicutas them do not grow in polluted areas.

FOUR / FIVE MARKS QUESTIONS:
1) What are the importance of heterotrophic bacteria.

Ans: (1) Conversion of milk to curd.

(2) Antibiotic productions.

(3) N2 fixation in leguminous roots.

(4) Act as pathogen, causing diseases like cholera, typhoid, Tetanus.

(5) Damage corps (citrus canker disease)

(6) Act as ‘Scavengers of nature’ by decomposing dead & decaying organic matter.

2) Write the characteristic features of the kingdom – moneron – protists.

Ans: (1) All protists are single celled eukaryotes.

(2) It includes plant protist (photosynthetic protozoans) & animal protists.

(3) Protist members are primarily agnatic in nature & some are Parasitic.

(4) The kingdom protista links with other, plants, fungi & animals.

(5) Same protistans members have flagella orcilia as locomotary organs.

(6) Protists reproduce asexually by binary fission & sexually by aprocose involving cell fusion & Zygote formation.

3) Write the important characters of chrysophytes ?

Ans: (1) Chrysophytes use the unicellular, microscopic eukaryotic protists.

(2) This group includes diatoms & desmids which are called “golden algae” (the Jewels of the plant kingdom due to their beautiful designed cell wall or fragmentation)

(3) They are found in fresh water and marine water.

(4) They float passively in water currents (plankter)

(5) Most of chrysophytes (diatoms) are photosynthetic in nature & are the chief producers in the oceans.

(6) The diatoms cell walls have two twin silicones overlapping walls.

(7) Diatomaceous earth the gritty soil deposited over a period of billions accumulated) of years is useful in polishing, filtration of oils & syrups.

4) Write the characters of Dinoflagellutes ?

Ans: (1) Dianoflagellates are mostly found in marine water.

(2) They are photosynthetic in nature.

(3) Depending on the main pigment in their cells, they appear blue, green, brown, yellow or red in colour.

(4) The cell wall has stiff cellulose plates on the enter surface.

(5) Most of dinoflagellates have two flagella.

(6) Due to rapid multiplication, red dinoflagellates lix gonya and the toxizes released by these large numbers of dinoflagellates may kill the other marine animals such as fishes.

5) Write the five characters of engrenoids?

Ans: (1) Engrendois are the unicellular, microscopic protists found in stagnant fresh motor.

(2) Cell wall is absent but proteinocous flexible pellicle is present a protective layer.

(3) They have two flagella, one is long & other is short.

(4) They are photosynthetic in presence of light.

(5) In the alosence of light, they behave like heterotrophs (dseprived) by preduting on other smaller organisms.

(6) The interesting feature of the engrenoids is the presence of the pigments identical to those present in higher plant.

6) Write the important characters of Slime moulds ?

Ans: (1) Slime moulds are the unicellular saprophytic protists.

(2) Under suitable conditions, aggregntion of the slime mould body moves along decaying twigs & learns which may grow & spread several feet called plasmodium.

(3) This plasmodium during unfavorable conditions, differentiates to produce fruiting bodies bearing spores at their tips.

(4) Even under adverse conditions these spores extremely resistant and can survive.

(5) The spores are dispersed by air currents.

7) Write the salient features of protozoan’s ?

Ans: (1) All protozoan’s are eukaryotic, microscopic, unicellular.

(2) They are heterotrophic, live as predators or parasites (plasmodium & Trypanosome)

(3) They are believed to be primitive relatives of animals.

(4) Protozoan’s are grouped in to four major groups, such as

(1) Amoeboid protozoan’s (2) Flagellated protozoan’s (3) ciliated protozoan’s (4) Sporozoan’s

8) Write the general character of kingdom Fungi ?

Ans: (1) The fungi are the unique heterotrophic organisms either saprophytic or parasitic or symbiotic.

(2) The fungi are cosmopolitan in distribution and occur in air, water, soil and on plants & animals.

(3) They are unicellular (yeast) or multi cellular, eukaryotic, organisms.

(4) Fungi are filamentous and the body consisting of long, slender thread like structures called hyphae, may be coenocytes hyphane or septate hyphore.

(5) The network of hyphae in fungi is called mycelium.

(6) The cell walls of fungi are composed of chitin and polysachandes.

(7) Reproduction in fungi can takes place by three methods (1) Vegetative (2) Asexual (3) Sexual reproduction.

(8) Fungi are classified into 4 major classes :-

(1) Phycomycetes (2) Ascomycetes (3) Basidiomycetes and (4)Denteromycetes.

9) Write the 4 characters phyconmycetes ?

Ans: (1) Phycomycetes are found in a genetic habitats, moist and damp places where wood is decaying.

(2) Some of are parasites on plants.

(3) A sexual reproduction takes place by zoopsores (motile) or by aplanospores (non – motile)

(4) Sexual reproduction takes place by the fusion of gametes to produce the zygospore.

10) Write the characters of Ascomycetes?

Ans: (1) Ascomycetes are commonly called as “Sac – fungi”

(2) These are multicellular namely unicellular (yeast)

(3) They are saprophytic, decomposers, coprophilory (growing in dung) or parasitic.

(4) Mycelium is branched & septet.

(5) The Asexual spores are called conicha, developed on Conidiophores.

(6) The sexual spores are called ascospores, developed in sue like asci, on ascocarps.

(7) Many members are edible (morels & buffles)

11) Write the important characters of Basidiomycetes ?

Ans: (1) They grow soil, on loss, & tree stumps.

(2) Some are plant parasites (rusts & smuts)

(3) These are commonly known as mushrooms, bracket fungi & puff balls.

(4) The mycelium is branched & septate.

(5) Vegetative reproduction takes place by fragmentation.

(6) Asexual reproduction with sexual spores is absent.

(7) The sex organs absent, but plasmogumy and karyogamy processes are found basidiomycetes.

(8) The fruiting bodies are called basidiocarps.

(9) The basidium produces 4 basidiospors by meiosis.

11) Write the important characters of denteromycetes ?

Ans: (1) Denteromycetes are commonly known as imperfect fungi.

(2) The nycelium is branched and septate.

(3) They have only the vegetative or asexual phases.

(4) They reproduce only by asexual spores known as conidia.

(5) Some are saprophytes or decomposers or parasites.’

(6) Decomposers are helpful in Mineral recycling.

12) Write the important characters of the kingdom plantae ?

Ans: (1) Kingdom plantae includes all eukaryotic chlorophyll containing organisms called plants.

(2) Prominent chloroplasts are found in the cells.

(3) Cells have cellulosic cell wall.

(4) Except few most plants are autotrophic.

(5) some are heterotrophic, include insectivorous plants. (like venus fly trap & bladder wort) and parasites (Cuscuta).

(6) Life cycle of plants has two distinct phases –

(1) The diploid (2n) saprophytic phase.

(2) The haploid (n) gamatophytic phase.

(7) There is the phenomenon of alternation of generation.

(8) The kingdom plant a includes algae, bryophytes, pteridophytes, gymnosperms & angiosperms.

13) Write the important characters of the kingdom- Animalia ?

Ans; (1) Kingdom Animalia includes heterotrophic, multicellular, eukaryotic organisms.

(2) Cells are not containing cell walls.

(3) Animals directly or indirectly depend on plants for food.

(4) they digest their food in an internal cavity.

(5) Animals store food reserves as glycogen or fat.

(6) The mode of nutrition in animals is holozoic (by ingestion of food)

(7) Higher forms animals show elaborate sensory and neuromotor mechanism.

(8) Most of the animals are capable of locomotion.

(9) The sexual reproduction is by copulation of male & female, followed by embryological development.

14) List the characteristics of Viruses ?

Ans: (1) Viruses are neither living nor non – living.

(2) Viruses for this reason do not find a correct place in classification.

(3) Viruses do not possess cells, hence they are not truly living.

(4) viruses are non cellular organisms.

(5) They are inert crystalline structure outside the living cell.

(6) Once a virus infect a cell, replicate themselves in the host cell and kill the host.

(7) Viruses contain both protein and genetic material either RNA or DNA, never both.

(8) No virus contains both RNA & DNA.

(9) A virus is nucleoprotein and its genetic material is infectious.

(10) Virus that infect plants have single strand of RNA.

(11) The virus that infect animals have either single or double stranded RNA or double stranded DNA.

(12) Viruses that infect bacterial cells are called bacteriophages, which have double stranded DNA.

(13) The protein coat of virus is called capsid, made of small units called Capsomeres, which protect the central nucleic acid.

(14) The capcid capsomeres are arranged in heleical or polyhedral geometric forms.

(15) In plants TMV causes leaf mosaic disease, leaf curling disease, leaf rolling disease, yellowing and vein clearing disease.

(16) Viruses cause diseases in human being such as – AIDS, Small pox, Mumps, Herpes, Influenza.

Plants fiber and fabric solution Cordova Learning Science class07

noreply@blogger.com (J.Sunil Sir) — Wed, 18 Apr 2018 17:12:00 +0000

A Tick the correct options:
1. Which of the following is not a natural fibre?

(a) cotton (b) rayon √ (c) silk (d) wool

2. Lohi is the breed of

(a) cow (b) silk moth (c) sheep √ (d) buffalo

4. Sheep are sheared in season

(a) summer √ (b) spring (c) autumn Ö (d) winter

3. How many weeks are required for the eggs of silk moth to hatch? See book

(a) one (b) two √ (c) three (d) four

6. Which of the following silk is produced when raw silk is twisted?

(a) spun (b) coloured (c) thrown √ (d) mooga

5. What do we call the silky covering spun by the silkworm for its protection?

(a) moth (b) larvae (c) pupa (d) cocoon√

B. Fill in the blanks:

1. Alpaca is generally found in South America.

2. Silk and wool fibres are obtained from animals.

3. Silk is obtained from cocoons of silkworm.

4. Natural fibres are obtained from plants and animals.

6. The fewer the burrs, the better is the wool.

7. The eggs are warmed to a suitable temperature in an oven

8. During the period of spinning of its cocoon, a silkworm is transformed into Pupa.

C. State whether the following statements are True (T) or False (F). Rewrite the false statements correctly:

1. Silk is obtained from cocoons of silkworms. (T)

2. The process of washing the fleece of sheep to remove dust, dirt, sweat and grease is
called shearing.

False Scouring.

3. The rearing of silkworms for obtaining silk is called sericulture. T

4. The damaged or waste cocoons are used to produce raw silk. F

Spun silk

D. Very Short Answer Questions:
1. What is the process of removing the burrs from fleece called?

Ans. Combing

2. Name any two breeds of sheep found in India.

Ans. Merino ,Lohi

3. Name the process of removing hair from the body of a sheep.

Ans. Shearing

4. Name the sheep which is found in Gujarat and whose wool is used in hosiery.

Ans. Patanwadi

6. Which country leads the world in silk production?

Ans. China

5. What is the process of taking out threads from the cocoon called?

Ans. reeling the silk

7. Name two wool-yielding animals.

Ans. Sheep, goat, yak and camel.

E. Short Answer Type-I Questions:
1. What is meant by rearing of sheep?

Ans. The raising and breeding of domestic sheep is called rearing of sheep.

Sheep are raised principally for their meat (lamb and mutton), milk (sheep's milk), and
fiber (wool)

2. What is throwing?

Ans. Throwing is the process of twisting and doubling the single raw silk fibres into
usable thread after reeling and cleaning.

3. Why does shearing not hurt the sheep?

Ans. Shearing doesn't usually hurt a sheep. It's just like getting a haircut.

4. What is meant by scouring?

Ans. The sheared skin with hair is thoroughly washed in tanks to remove grease, dust
and dirt. This is called scouring.

5. What is cocoon?

Ans. A cocoon is a soft covering that an insect spin with silky thread to protect itself.

F. Short Answer Type-I Questions:

1. What is meant by selective breeding? What is its purpose?

Ans. Selective breeding is a kind of artificial selection in which two different kind of
breed are crossed to develop new organisms with desirable characteristics. For example
native breeds (female) crossed with exotic breed (male).

2. What is silk? How do we get silk from cocoon?

Ans. Silk is a kind of animal which are soft and lustrous.

The cocoons are kept under the sun or boiled or exposed to steam. The silk fibres
separate out.

3. (a) What are raw silk and spun silk?

(b) On burning silk, it gives out the smell of burning hair. Give reason.

Ans. (a) Silk fibre obtain from cocoon and twisted to make stronger thread is called raw
silk. Silk fibre obtain from damaged cocoon is called spun silk.

(b) On burning silk gives out the smell of burning hair as it is made up of protein

4. With the help of a flow chart only, describe the life cycle of a silkworm.

5. (a) What is sorter's disease?

Ans. People working in wool industry sometimes they get infected by a bacterium called
anthrax, which causes a fatal blood disease called sorter’s disease

(b) Name two Indian breeds of sheep and also mention the quality of wool produced.

Ans. (i) Deccani sheep breed - low grade fibres, mostly used for the manufacturing rough
blankets (Kambals).

(ii) Gaddi Sheep Breed - wool is fine and lustrous and it is used for manufacturing of
high quality kulu shawls and blankets.

6. (a) Why do wool yielding animals have a thick coat of hair on their bodies?

Ans. wool yielding animals have a thick coat of hair on their bodies so that sheep can
withstand with cold weather.

(b) The process of removing hair from the body of sheep is called shearing. Why is
shearing done in summers?

Ans. Sheep are usually found in hilly and cold region. Shearing of sheep done in
summers because sheep can survive without their protective coat of hair.

G. Long Answer Questions:
1. Write the various steps involved in the production of silk cloth from silk moth.

Ans. a. Incubation: The silk moth eggs are warmed to a temperature suitable for
hatching. This is known as incubation.

b. Rearing: After hatching, the silkworms are fed on mulberry leaves for six weeks, and
the worms eat almost continuously and increase in size.

c. Spinning: Branches of trees or shrubs are placed in their rearing houses. The worms
climb these branches and make their cocoons out of one continuous thread.

d. Reeling: The cocoons are first boiled or treated in ovens, killing the insects by heat.
The silk fibre is then obtained from the cocoons by a delicate process known as reeling.
This fibre woven into cloth.

2. Describe the process of wool production.

Ans. The different processes involved in wool production are shearing, scouring, grading,
dyeing, and drying.

Shearing: The process of removal of the fleece from an animal is called shearing.

Scouring: The sheared hair is washed properly to remove dirt, dust, and grease. The
process of removing dirt, dust, and grease from the sheared hair is called scouring.

Grading : the wool is sorted on the basis of length, colour, texture

Dyeing: As the natural colour of fleece is white, brown, or black, the sheared wool is
dyed in different colours.

Drying : In this process, containers of wool are put through rollers to squeeze out as
much water as possible. Then the wool is weighed and packed into bales. The bales are
transported to the mills where they are processed further for making cloth

3. Discuss various varieties of natural silk.

Ans. Eri silk – it may be white or brick-red ;

Muga silk - golden-yellow silk thread which is very attractive and strong.

Mulberry silk – it contributes to around 90 percent of the world silk production.

Tasar silk - copperish colour mainly used for furnishings and interiors.

H. HOTS (Higher Order Thinking Skills) Questions:
1. How is selective breeding advantageous for us?

Ans. selective breeding increase the production by selecting best variety of animals.

2. Why are animal activists against the silk production?

Ans. Animal activists are against the present process of getting silk from the cocoon
because in this process the pupa are killed in a cruel way by boiling them in water.

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10th English CBSE Sample papers final exam 2018(by jsunil)

noreply@blogger.com (J.Sunil Sir) — Fri, 09 Mar 2018 15:53:00 +0000

10th English CBSE Sample papers final exam 2018
10th English Communicative Sample question paper 2018 Marking Scheme prepared by team of KV teachers.

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Class 9 and 10 CBSE Sample papers are added for final exam 2018. Kindly practice it for getting good marks. All the best !! JSUNIL
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10th Final Exam CBSE sample paper 2018

noreply@blogger.com (J.Sunil Sir) — Tue, 20 Feb 2018 17:01:00 +0000

10th Maths Sample paper CBSE Board Exam 2018

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9th Real school exam papers for final exam 2018

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IX Maths final exam Sample paper 2017-18

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Sources of energy class10 oswal solved questions

noreply@blogger.com (J.Sunil Sir) — Sat, 06 Aug 2016 12:03:00 +0000

Short Answer Type Questions (2 marks each)

Q. 1. List four gases generated in a biogas plant

Ans. (i) Hydrogen (ii) Hydrogen sulphide (iii) Methane (iv) Carbon dioxide.

Q. 2. Name the major constituent of biogas. List three characteristics to prove it as an excellent fuel.

Ans. Methane is the major constituent of biogas.

Three characteristics to prove it as an excellent fuel : (i) Smokeless (ii) Leaves no residue (iii) Higher heat of combustion.

Q. 3. Mention the main use of slurry left behind in the biogas of plant. State the characteristics of the slurry on which this use is based.

Ans: Slurry is used as a manure as it is rich in nitrogen and phosphorus.

Q.4. List any four reasons why we need to look for alternate sources of energy.

Ans: Four reasons we need to look for alienate sources of energy are :

(a) Pollution due to fossil fuels. (b) Exhausting fuel reserves.(c) Increasing need. (d) Replenishment is not easy.

Q.5. List any four qualities of an ideal source of energy.

Ans: Qualifies of an Ideal Source of Energy : (a) More heat per unit mass. (b) Pollution less and smoke free (c) Cheap and Economical. (d) Easily available and easily handled. (e) Safe to transport. (any four)

Q.6. (a) What is solar cell panel ? (b) Name any two elements that are used for making solar cell panels.

Ans. (a) A combined arrangement of a large number of solar cells that can deliver sufficient electricity for practical use is known as solar cell panel. (b) Silver, Silicon.

Q. 7. Why is charcoal considered to be a better fuel than wood ?

Ans. Charcoal is better fuel than wood because (a) It is smokeless and leaves no residue. (b) It has a higher heat of combustion.

Q. 8. List any two disadvantages of using fossil fuels.

Ans. (a) Burning of coal or petroleum products lead to air pollution (b) The oxides of C, N and S are released on burning fossil fuels as acidic, oxides. It leads to acidic rain and affect water and soil.

Q.9. List two reasons which limit the usage of solar cells for harnessing energy for domestic use.

Ans. (a) Availability of the special grade silicon for making solar cells is limited. (b) The process of manufacture is expensive, silver used for interconnections of the cells in the panel further adds to the cost.

10. Biogas isconsidered to be a boon to the farmers. Give reasons.

Ans. (a) Farmers can produce clean fuel from biowastes. (b) Spent slurry is used as a best manure and can be used to generate electricity.

Q. 11. Give two advantages of using nuclear energy.

Ans. Two advantages of using nuclear energy am (a) Very small mass of Uranium yields tremendous energy. (b) The released energy can be used to produce steam and further generate electricity.

Q.12. State any three characteristics of a good source of energy. Name the gaseous fuel which has the highest calorific value.

Ans. Characteristics of Good Source of Enemy : (a) Large amount of work per unit volume/mass. (b) Easily available (c) Easy to transport. Gaseous fuel of highest calorific vlaue-hydrogen.

Q. 13. (a) Hydrogen is used as a rocket fuel. Why ? (b) List two limitations of using solar cookers.

Ans. (a) Hydrogen is comparatively a cleaner fuel than any other gaseous fuel as on its burning only water is produced which does not pollute the environment. (b) (i) Can not be used in night/cloudy days. (ii) Direction of reflector has to be changed from time to time.

Q. 14. What is a nuclear fusion reaction ? List any two advantages of nuclear fusion reactions.

Ans. Reaction in which two nuclei of lighter elements combine and form a heavy nucleus with release of tremendous amount of energy.

Two advantages : (a) Large amount of energy from a very small amount of fuel. (b) Produces non-pollutant waste/does not produce gases which pollute the environment/ muse green house effect.

Q. 15. Large scale use of nuclear energy becomes prohibitive due to some hazards. State any two major hazards associated with a nuclear power plant.

Ans. (i) Storage and disposal of spent or used fuels which decay into sub-atomic particles with harmful radiations. (ii) Nuclear waste storage and disposal result in environment contamination or accidental leakage of nuclear radiations.

Q. 16. A student constructed a model of box type solar cooker. He used a transparent plastic sheet to cover the open face of the box. He found that this cooker does not function well. What could be the possible draw backs in his model List any four draw backs.

Ans. He may not have used (a) Black painted sheet to absorb heat radiation. (b) Black cooking vessel to absorb heat radiation. (c) Glass sheet - prevents the escape of heat radiation from the box instead of plastic sheet. (d) Mirror plate reflects the sunlight to fall on the glass sheet.

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8th Class Cell structure and function solved questions(Biology)

noreply@blogger.com (J.Sunil Sir) — Fri, 05 Aug 2016 23:30:00 +0000

Q Name the cells having branches structure.

Ans Nerve Cell.

Q Why cells could not be observed before seventeenth century?

Ans Cells could not be observed before seventeenth century because till that time microscope was not invented.

Q Why plant cell have cell wall?

Ans Plant cells need protection against variations in temperature, high wind speed, atmospheric moisture, etc.
They are exposed to these variations because they cannot move. That's why they have cell wall.

Q Which organism has the smallest cell?

Ans Mycoplasmas, a bacteria has the smallest cell of the size of 0.1 micron i.e. ten thousandth part of a mill metre. '

Q Which is the largest cell visible by unaided eye?

Ans Ostrich egg has the largest visible cell by unaided eye.

Q Name the four elements, which fonn major part of protoplasm.

Ans These are carbon, hydrogen, oxygen and nitrogen.

Q Give two examples of prokaryotes.

Ans Bacteria and blue green algae.

Q Name the largest organelle present in a cell.

Ans Vacuoles

Q Why do we stain the small components of section, before seeing under the microscope? Name a
stain. Marks (2)

Ans) Staining with coloured dyes makes the parts clearly visible. The dyes react with cellular components to give colour to the components. Eosin is a stain which gives a red orange colour.

Q Why is the cell called basic unit of living organism?

Ans Cell is the structural and functional unit of an organism because a cell in itself is the smallest part of an organism which is capable of functioning independently and can carry out the fundamental duties of life like reproduction, metabolism (photosynthesis and/or respiration).

Q What is the function of cell membrane?
Ans The function of the cell membrane is to let particles move in and out, to or from the cell.

Q Why mitochondria is called powerhouse of cell?

Ans Mitochondria provide the energy to the cell for carrying out various activities. So it is called powerhouse of cell.

Q. Write the functions of the following a) Mitochondria b) Chromosomes c) Plastids Marks (3)

Ans Functions are as follows:

( a ) Mitochondria provide the energy to the cell for carrying out various activities. Mitochondria are rod shaped and very minute bodies present in cytoplasm. They are concerned with release of energy from food during respiration. Because of this they are often referred to as the power house of the cell.

(b) Chromosomes transfer the characters from parents to the next generation.

(c) Plastids found in plant only and are the largest cell organelle containing pigments. They give colour to ﬂowers and fruits, which help in pollination.

The green plastids in the plants are celled chloroplasts. They help in the synthesis of food.

The red colour plastid in tomato is due to the plastids with red pigments

Q.How does nucleus help in transmission of characters from parents to children?

Ans Nucleus contains chromosomes, which have genes present on them. These genes carry information about characters of an individual. These genes are transferred from parent to children and hence characters are transmitted from parents to children.

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class9 why do we fall ill solved questions

noreply@blogger.com (J.Sunil Sir) — Tue, 08 Dec 2015 15:56:00 +0000

WHY DO WE FALL ILL CLASS-IX STUDY MATERIAL

1. Define health.

Ans. Health is defined as the state of complete physical, mental and social well being.

2. What is disease?

Ans. Disease is a departure from normal health through structural or functional disorder of the body.

3. What is the most important factor that keeps us healthy?

Ans. Our social environment is an important factor in our individual health.

4. List any two conditions essential for good health.

Ans. Conditions essential for good health are:

i. to have a balanced diet and varied diet.

ii. avoid wrong habits like drinking alcohol and drug consumption.

5. List any two conditions essential for being free of disease.

Ans. Conditions essential for being free of disease are:

i. maintain personal hygeine.

ii. keep environment clean and hygiene.

6. Give examples of diseases which are caused by intrinsic sources and extrinsic sources.

Ans. Diseases caused by intrinsic sources: Heart attack, Kidney failure, Sickle cell anaemia, Diabetes, etc.

Diseases caused by extrinsic sources: Night blindness, Malaria, Rabies, Hepatitis, Dysentery, etc.

7. Why is public cleanliness important for individual health?

Ans. Many public places are left messy and unsightly. Some industries pollute the environment. In many drains water flows uncovered or water is stagnant. All these enhance the growth of germs and chances of infection. Therefore, public cleanliness is important for individual health.

8. Give at least two examples of each:i. Physical diseases ii. Mental disease iii. Deficiency diseases

Ans. i. Cold and bone fracture ii. Depression ,Schizophrenia iii. Night blindness and Scurvy

9. Enlist some intrinsic and extrinsic factors which affect human health.

Ans. Intrinsic factors:

i. Malfunctioning of some vital body organs and immune systems

ii. Genetic disorder

iii. Hormonal imbalance

Extrinsic factors:

i. Unbalanced or inadequate diet

ii. Disease causing organisms

iii. Pollutants

iv. Bad food and drinking habits

10.What do you mean by symptoms of diseases?

Ans. Symptoms of disease are the things we feel as being ‘wrong’. Symptoms are the physical or behavioral signs of a suspected injury or disease.

11.Define communicable diseases.

Ans. Communicable disease is defined as the disease that is transmitted through direct contact with

an infected individual or indirectly through a vector.

12.Differentiate between acute and chronic diseases.

Ans.

Characters	Acute Diseases	Chronic Diseases
Duration	Last for short duration.	Last for long duration
Damage to body	Cause less damage to	Cause great damage to
	body tissues and parts	body tissues and parts
Example	Common cold	Tuberculosis

13.Give one word for:

i. Diseases which can spread from one person to another

ii. Diseases which are present since birth

iii. Diseases which last for short duration

iv. Disease which last for longer duration

Ans. i. Infectious diseases or communicable diseases ii. Congenital diseases

iii. Acute diseases iv. Chronic diseases

14.Give examples of:

i. Infectious diseases ii. Non-infectious diseases iii. Acute diseases iv. Chronic diseases

Ans. i. Malaria ii. Heart-attack iii. Common cold iv. Tuberculosis

15.What do you understand by non-communicable diseases?

Ans. A non-communicable disease a disease which do not spread through direct contact with an

infected individual or indirectly through vector. Such diseases may result from genetic or lifestyle

factors.

16.What are the causes of non-infectious diseases?

Ans. Following are the causes of non-infectious diseases:

i. deficiency of certain essential substances in our diet

ii. degeneration and wearing out of tissues

iii. uncontrolled proliferation of tissues in any part of body

iv. defects in metabolic pathways

v. damage and injuries of tissues and body parts by accidents

17.What are congenital disorders? How do they occur? Can they be cured?

Ans. Congenital disease is a disease or disorder that is inherited genetically and present at the time of

birth.

These diseases are caused because of genetic abnormalities, metabolic disorders or malfunctioning of

any organ in body.

No, congenital diseases cannot be cured. They are permanent.

18.Which antiviral protein is secreted by our body in case of viral infection?

Ans. Interferon is secreted by our body in case of viral infection.

19.Name the bacteria that are responsible for peptic ulcers.

Ans. Helicobacter pylori is responsible for peptic ulcers.

20.Why does a man suffering from an acute disease suffer less than a man suffering from a chronic disease?

Ans. Chronic diseases last a long time and hence, they damage body parts and tissues to a greater extent than an acute disease, which lasts for a very short duration. Therefore, a patient suffering from a chronic disease endures more agony than a patient suffering from an acute disease.

21.Define vector.

Ans. Vector is defined as an agent (person or animal or microorganism) that carries and transmit a disease.

22.Which viral disease suppresses bodies immune system?

Ans. AIDS

23.What is vaccination?

Ans. The process of injecting killed or attenuated microbes in order to activate the immune system against disease causing microbes to prevent from disease/s is vaccination.

24.Name the causative agent of sleeping sickness.

Ans. Sleeping sickness is caused by Trypanosoma.

25.Give at least one example of each:

i. disease caused by bacteria ii. disease caused by virus

iii. disease caused by protozoa iv. disease spread through vector

Ans. i. Tuberculosis ii. Jaundice iii. Sleeping sickness iv. Malaria

26. Name the organs which are mainly affected by the following diseases:

i. Jaundice ii. Hepatitis iii. AIDS iv. Encephalitis

Ans. i. Liver ii. Liver iii. Immune system iv. Brain

27.What preventive measures can be taken against infectious diseases?

Ans. Diseases can be prevented in general and specific ways.

a. General ways of prevention are:

I. Community hygiene is one of the basic methods to the prevention of infectious diseases

II. Air-borne diseases can be controlled by making living conditions that are not overcrowded.

III. Water-borne diseases can be prevented by providing safe drinking water.

IV. Vector-borne infections can be checked by making vector free environment

V. Specific way of preventing infectious diseases is to immunize surrounding individuals against infectious diseases (if possible).

28.Write the causative agents for the following diseases:

i. Tuberculosis ii. Jaundice iii. Malaria iv. Polio

Ans. i. Mycobacterium tuberculosis ii. Hepatitis B virus iii. Plasmodium sp. iv. Polio virus

29.What are the different modes of transmission of diseases? Also give examples of diseases of each mode of transmission.

Ans. Infectious diseases can be spread through the following agents:

1) Through air: Cough or sneeze of an infected person may cause infection to a healthy person if he inhales the droplets containing microbes. Diseases like common-cold, tuberculosis, pneumonia, etc., are spread through air.

2) Through water: Consumption of water contaminated with the spores of bacteria or disease causing microbes can cause disease like cholera, amoebiasis.

3) Through sexual contact: Unsafe sexual contact with an infected partner many lead to may sexually transmitted diseases. For example, syphilis, AIDS, genital warts, etc.

4) Through vectors: Vectors (animals or microorganisms) carry the infecting agents from a sick person to another potential host. They act as a carrier of a disease or infection. Malaria is a very good example of this type of transmission of diseases.

30.How do antibiotics work against bacteria?

Ans. Antibiotics are drugs used to treat infections caused by bacteria. Some antibiotics, such as the penicillins, are 'bactericidal'. They work by killing bacteria. They do this by interfering with the

formation of the cell walls or cell contents of the bacteria. As a result bacteria die. Other antibiotics are 'bacteriostatic'. They work by stopping bacteria multiplying. Excess use of antibiotics can lead to

bacteria becoming resistant to them so it's important to only take them when necessary.

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2015-2016 Latest 10th original School CBSE paper Science SA- 1 (Sep-2015)

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Original Question Paper of Science[Exam 2015] Conducted in different CBSE schoolsSA-1 Class 9th & 10th Latest Papers (September 2015)

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Class 9 Mathematics SA-1 [Sep 2015] Sample Practice papers

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Class9 Biology chapter Cell the Fundamental unit of life :Assignment solved

noreply@blogger.com (J.Sunil Sir) — Mon, 13 Apr 2015 03:30:00 +0000

1. What is plasma membrane? What are their functions?

Ans:

Plasma membrane also called as cell membrane, is the outer covering of a cell that separates the cell contents (protoplasm) from the surrounding medium.
It is made up of proteins and lipids.
It gives form (shape and size) to the cell
It maintains the individuality of the cell (i.e. seperates cells)
It keeps the cell contents in place

2. What are cell organelles ?

Ans: The certain specific living parts of a cell with a definite function are celled Cell organelles. All cell are found to have same organelles and together these constitute to the basic unit of life.

3. What is cellulose and its functions?

Ans: Cellulose is the main component of a plant cell wall. It is responsible for giving structural shape to the cell and also to protect the protoplasm.

4. What is a Prokaryotic cell? Give an Example.

Ans: The cells that do not have a nuclear membrane and membrane bound cell organelles (i.e. well-defined nucleus) are known as Prokaryotic Cells. Example:- Blue green algae, Bacteria, Mycoplasma etc.

5. What are the advantages of multicellularity ?

Ans:

The division of labour in a multicellular organism increases the efficiency of the organism.
It increases the Chance of survival.

6. What are vacuoles? What are their functions?

Ans:

Vacuoles are clear fluid/gas filled spaces in the cytoplasm.
In plant cells, it is larger and less in number as compared to the animal cells.
Vacuoles help in the storage of water, food and other waste substances.

7. What is ER ? Name two types of ER. Write its main functions.

Ans:

Endoplasmic Reticulum or ER, is a network of tube like structures found in the cytoplasm.
The two types of ER are Rough Endoplasmic Reticulum (RER) and Smooth Endoplasmic Reticulum (SER).
It provides channel for quick transport of materials
It provides materials (i.e. lipids and proteins) for membrane biogenesis.

8. Write the Function of Chromatin material.

Ans: The Chromatin material mainly consists of DNA’s, therefore plays an important role in storing and transmitting hereditary information (DNA) from one generation to another.

9. Name a cell that lacks membrane. Where is it prepared?

Ans: Ribosomes is a cell organelle which lacks membrane and is prepared in the Nucleolus.

10. What is plasmolysis? What happens to a plasmolysed cell when it is placed in water ?

Ans:

The detachment of cell membrane of the plant cell from the cell wall when put in Hypertonic Solution is known as Plasmolysis.
The cell that has undergone plasmolysis i.e. plasmolysed cell when placed in water, the water moves into the cell from the solution due to the higher concentration of water in the solution (Endosmosis) and therefore the cell swells.

11. What do yo mean by nucleoid?

Ans: The undefined nuclear region of prokaryotic cells like blue green algae are known as nucleoid. The nucleoid contains nucleic acid but does not have any membrane covering it.

12. What are the factors which restrict the size of the cell?

Ans: The factors which restrict the size of the cell are:

Functions of cell.
Cell’s requirement of oxygen and other materials from the environment.
Regulating ability of the nucleus of the cell.

13. Name the two nucleic acids present in the cell and their functions.

Ans:

Ribose Nucleic Acid (RNA) – It helps in protein synthesis.
Deoxyribo Nucleic Acid (DNA) – It stores heriditary information.

14. Give any two functions of plastids.

Ans:

Chloroplast is the site of photosynthesis and helps in preparing food (in case of plant cells).
Leucoplast are the site of storage of food.
Chromoplast provide colour to various flowers and fruits.

15. Write down the main functions of cell wall.

Ans:

Cell wall provides shape as well as rigidity to the cell.
It protects the protoplasm.
It is involved in the movement of materials in and out of the cell.
It prevents the cell from bursting even in very dilute solution.

16. Describe in short the chief components of a nucleus.

Ans:

Nucleoplasm – the semi-fluid part of protoplasm lying inside the nucleus, in which nucleoli and Chromatin fibers are found.
Nucleolus – a dense, spherical, darkly stained structure, which the site of formation and store house of RNA’s.
Nuclear Membrane- The membrane that bounds the nucleus, which semi-permeable, double layered and porous.

17. What role does a nucleus play in cellular reproduction?

Ans: The nucleus plays the central role in the cell division/reproduction. Nucleus carry the hereditary information and it divides to form two new cell by the process of cellular reproduction. Apart from that, nucleus also plays a vital role in determining when the cell will divide.

18. Write functions of lysosomes?

Ans:

They take part in intracellular digestion of foreign particles.
They provide energy during starvation.
They help in defence against bacterial and viral infections.
They remove cellular debris.

19. Define Osmosis. In what ways it is different from diffusion?

Ans:

Diffusion

Diffusion is defined as the movement of particles from a region of high concentration to a region of low concentration.

Osmosis

Osmosis is defined as the passage of water from a region of high water concentration to a region of low concentration through a Semi-permeable membrane.

20. Write one function each of – Ribosomes, Vacuole, Plasma Membrane

Ans:

Ribosomes : It helps in Protein Synthesis
Vacuole : They help in the storage of water, food and other waste substances.
Plasma Membrane : It regulates the flow materials in and out of the cell.

The FundamentalUnit of Life – Short Answer Type Question

Obtaining and Utilization Food Class 7 Science Solved question (Basic Science Questions answers)

noreply@blogger.com (J.Sunil Sir) — Thu, 02 Apr 2015 14:52:00 +0000

A. Answer these questions

1. Name the three life process help living being to procure energy from food?

Answer: Three life processes that help living organisms to procure energy from food are:

(i) Digestion (Nutrition)

(ii) Respiration

(iii) Transportation

2. What are Autotrophs? Name an organism other than other than green plant that is an autotroph.

Answer: Autotrophs are organisms that can prepare their own food.

Chlamydomonas is a type of green algae which is an example of an autotroph, other than green plants.

Cyanobacteria are also an example of autotroph.

3. Name three type of heterotrophic nutrition

Answer: Three types of heterotrophic nutrition are:

(i) Saprophytic nutrition (ii) Parasitic nutrition (iii) Holozoic nutrition

4. What are enzymes?

Answer: Enzymes are chemical substances that act as biological catalysts and are important for carrying out biochemical processes, such as digestion, in our body

5. Name the steps involve in holozoic nutrition.

Answer: Holozoic nutrition involves the following steps:

(i) Ingestion (ii) Digestion (iii) Absorption (iv) Assimilation (v) Egestion

6. Name the three things green plant need in order to photosynthesize.

Answer: Green plants require the following three things to prepare their food:

(i) Carbon dioxide (CO2) (ii) Water (H2O) and (iii) Sunlight

7. What is the juice secreted by liver called? What does it do?

Answer: Juice secreted by the liver is called bile. It helps in digestion of fats by breaking them down into small droplets

8. Name a parasitic plant, and a parasite that live in our intestine?

Answer: Cuscuta is a parasitic plant. Tapeworm ( Ascaris) is a parasite that lives in our intestines.

9. What is digestion?

Answer: Digestion is the process of breaking down complex food material into simpler form so that they could be absorbed into the watery blood plasma.

10. Name the Holozoic animal that not a herbivore or a carnivore or an omnivore?

Answer: Spider (also earthworm, mushroom is a Holozoic organism but not a herbivore or a carnivore or an omnivore

B. Answer these questions

1. What are saprophytes and parasites?

Answer: Saprophytes: Saprophytes are the organisms that feed on dead and decaying organic matter. Example: Bread mould (a fungi)

Parasites: Parasites are organisms that derive their nutrition from other animals or plants by living inside their body or on it. Example: Round worm

2. Write two special feature related to the teeth of herbivore?

Answer: Herbivores feed on green plants, which are difficult to chew and digest due to cellulose in them. Herbivores have large, dull, flat teeth. These teeth are excellent for chewing and breaking down tough plant material. They also have sharp - edged incisors in the front to help them cut the grass.

3. Write briefly about the process of nutrition in amoeba?

Answer: Amoeba use fingers like projections called pseudopodia to engulfing the food. Then food reach the food vacuole, where it gets digested by the action of enzymes.

4. Why do carnivores plant trap insects? Explain how such plant trap insect?

Answer: Carnivore plants are found at places where there is lack of nitrogen in soil. Therefore they trap insects and digest them to fulfil their nitrogen requirement for making protein. For example, sundews and pitcher plants.

Leaves of these of plants are modified to secrete sticky substance that attract and capture insects.

5. What are Symbionts? Explain with an example.

Answer: Symbionts are organisms that live together for mutual benefits.

An example of symbiont is nitrogen fixing bacteria. They live in the root nodules of plants to get food and fix atmospheric nitrogen into soluble form, which is useful for plants. They fix nitrogen for plants and plants provide them food and protection.

6. What is digestive juice in mouth called? What enzymes does it contain and what does it do?

Answer: Digestive juice in the mouth is called saliva.

Saliva contains enzyme called amylase. This enzyme acts upon complex carbohydrates starch to convert them into simpler carbohydrates such as sugar (maltose) . Thus, saliva helps in partial digestion of carbohydrates.

7. What is peristalsis? Does it occur only in the oesophagus?

Answer: The alternate relaxation and contraction of organs made of smooth muscles in our body is called peristalsis. For example food pushed down the oesophagus by peristalsis.

No, it occurs in the whole alimentary canal and not just in oesophagus.

8. The juice produced in stomach contain an acid and as well as enzymes. Name the enzymes. What do the acids and enzyme do?

Answer: The juice produced in the stomach contains hydrochloric acid and pepsin enzyme. Hydrochloric acid kills the bacteria and other pathogens, and pepsin helps in the digestion of proteins.

9. What happen to the undigested food that remains in large intestine?

Answer: At first some water is absorbed from the undigested food and remaining are thrown out of the body via the anus in the form of semisolid waste (faeces) .

C. Answer these questions

1. How would you show that chlorophyll is needed for photosynthesis?

Answer: Take a leaf and put it in a test tube, half filled with alcohol. The leaf should be submerged in the alcohol in such a way that half of it remains outside. Put the test tube in a beaker filled with water and heat it.

Direct heating of the test tube containing alcohol should be avoided as it may catch fire.

The part of leaf submerged in the alcohol will start losing colour, as alcohol destroys its green pigment, chlorophyll. When this half leaf loses its colour completely, pull out the leaf and wash it gently to remove alcohol. After a few minutes, put some drops of iodine on the green and non green halves.

Observation: It is observed that the green part changes its colour to blueblack on dropping iodine. This indicates the presence of starch. The green pigment synthesises starch by trapping energy and gives blueblack colour on reaction with iodine. The colourless part of the leaf gives no such result.

Thus, it is confirmed that presence of chlorophyll is a must for photosynthesis to take place.

2. What happen to the food in the small intestine?

Answer: Complete digestion and absorption of food occur in the small intestine. As the food enters the small intestine, it is acted upon by a number of digestive juices secreted by the liver, pancreas and walls of small intestine.

Bile juice is secreted by the liver that breaks fat into smaller pieces to make it easily digestible.

Pancreatic juice secreted by pancreas act upon carbohydrates and proteins to digest them completely.

Walls of small intestine have many fingers like projections called villi, which help in increasing the surface area of the small intestine. This in turn helps in efficient absorption of digested food.

3. How many teeth an adult have ? Describe different types of teeth?

Answer: An adult human has 32 teeth arranged in the upper and lower jaws.

We have four kinds of teeth in our oral cavity or mouth. They are:

(i) Incisors : They are flat teeth that act like scissors. They help in cutting food.

(ii) Canines: These are sharp teeth and are very prominent in carnivores. They are pointed and help

in tearing food. They function like knives in carnivores and help them capture their prey.

(iii) Premolars: These are teeth having broad surface. They help in grinding and chewing food.

(iv) Molars : They also help in grinding the food and chewing it. They are larger than premolars

4. How did Dr. Beaumont study the function of the stomach?

Answer: see book page: 90

5. Explain how digestion occurs in ruminants?

Answer: The stomach of a ruminant (grass eating herbivores) is divided into four chambers and is capable of digesting cellulose. The four parts of the stomach are the rumen, reticulum, omasum, and abomasum.

Ruminants chew the grass partially before swallowing it. This half or partially chewed food goes to the first chamber of the stomach called rumen, where bacteria and other micro organism act on it . Then it is sent to reticulum. This half digested food is sent back to the mouth for rechewing. This re chewing of half digested food is called cud chewing or rumination.

Now, complete chewed food goes to the omasum where some water gets absorbed. At last food reach to abomasums where final digestion occur b the action of enzymes.

D. Fill in the blanks

1. The tubelike mouthpart of a butterfly is called a proboscis.

2. The process by which digested food enters the blood is called absorption.

3. Chemical substances produced in the body of an organism to help in the process of digestion are called enzymes.

4. The tube, starting from the mouth and ending in the anus, through which food passes is called the alimentary canal.

5. Digestion begins in the mouth.

6. The finger like folds in the wall of the small intestine are called villi

E. Choose the correct options

1. Heterotrophs are organism which (c) depend on sources other than themselves for food

2. Iodine makes starch turn (a) blueblack

3. The wall of the large intestine absorb (a) water

4. Assimilation is the process by which (c) digested food is utilised by the body5.

5.Cellulose forms a large part of the undigested matter we egest. It is

(d) undigested sugar

6. Plants store food as (d) starch

For more study visit: Class 7 Science Solved question (Basic Science Questions answers)

Maths board paper2015 set-2 solution CBSE

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CBSE Class 10th Mathematics Question Paper Solution 2015 cbse mathematics paperanswer key 2015 cbse 10th board maths question & answers with solution 2015. CBSE Board annual exam 2015 for Class 10th is going on. For convenience of students question paper with answer and solution of class 10h for 2015 are available. You candownload the question paper of Mathematics for class 10th. Another guidance and help of the students is also appreciating.

Board Paper Solutions (2015) Class: X: Maths 2015 Set 3: Solutions (All India)

CBSE 2014 – 2015 Class 09 SA2 Question Papers

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Social science class 9 CBSE Board Question paper 2015

9th maths Question Paper contributed by visitor 2015

Mathematics original papers 2015 class 9 CBSE sa2 [DAV Samastipur]

Science original papers 2015 class 9 CBSE sa2 [SDV samastipur]

Social Real papers 2015 class 9 CBSE sa2 [KV samastipur]

Maths original papers 2015 Bal Bharati Public School Navi Mumbai class 9 CBSE sa2

9th class original paper 2015 term-2 :St.Xavier senior secondary school

New CBSE Class IX Mathematics and Science Solved Question Paper for exam 2015

Class 10 Science CBSE Board Paper Solutions 2015 Delhi Set-2

noreply@blogger.com (J.Sunil Sir) — Thu, 05 Mar 2015 10:25:00 +0000

Q. 1. Write the name and formula of the 2nd member of homologous series having general formula CnH2n

Ans: CnH2n+2 is the general formula for the alkane series. So, the second member of the alkane family is ethane

Q.2. what is the magnification of the images formed by plane mirrors and why?

Ans: The magnification of the image formed by a plane mirror is 1. This is because the size of the image formed is equal to the height of the object

Q.3. What is meant by power of a lens?

Ans: The power of a lens the ability of the lens to converge or diverge an incident beam focused on it. P = 1/f

Q.4. Write two differences between binary fission and multiple fission in a tabular form.

Ans:

Binary Fission

Only two daughter cells are produced.

Nuclear division is immediately followed by cytoplasmic division.

Multiple Fission

More than two daughter cells are produced.

Nuclear division is not immediately followed

Q.5. (a) Why do we need to manage our resources carefully? (b) Why management of natural resources requires a long term perspective?

Ans:

(a) Since natural resources are limited and its demand is increasing day to day due to growth population

(b) The management of natural resources requires a long-term perspective so that these will last for the future generations

Q6. List four measures that can be taken to conserve forests.

Ans: four measures that can be taken to conserve forests are:

1) Indiscriminate deforestation should be prohibited. 2) Wastage of timber and fuel wood to be avoided.

3) Alternative sources of energy, such as biogas should be used to supplement fuel wood.

4) Forest fires should be prevented.

Q.7. Na, Mg and Al are the elements of the same period of Modern Periodic Table having, one, two and threevalance electrons res. Which of these elements

(i) has the largest atomic radius, (ii) is least reactive? Justify your answer stating reason Solution:

Ans: (i) sodium has the largest atomic radius. On going from left to right in the periodic table, atomic radius decreases due to increase in nuclear pull due to addition of proton.

(ii) Aluminum is the least reactive element. On going from left to right in the periodic table, the reactivity decreases due to increased nuclear charge require more energy to lose electron.

Q.8. From the following elements: 4Be; 9F; 19K; 20Ca

(i) Select the element having one electron in the outermost shell. (ii) Two elements of the same group.

Write the formula of and mention the nature of the compound formed by the union of 19K and element x ( 2 , 8, 7)

Ans: Electronic configuration of 4Be -------- 2, 2.

Electronic configuration of 9F is --------- 2, 7

Electronic configuration of 19 K is --------- 2, 8, 8, 1

Electronic configuration of 20Ca is ------------ 2, 8, 8, 2.

(i) K (ii) Be and Ca

Electronic configuration of element X is 2, 8, 7.

Valency of X = 8 − 7 = 1 and Valency of K = 1

Therefore, the formula of the compound formed when K and element X combine is KX. The compound KX is ionic compound

Q.9. What is meant by isomers? Draw the structures of two isomers of butane, C4H10. Explain why we cannot have isomers first three of alkane series.

Ans: Isomers are the compounds that have the same molecular formula but different structural formulae.

Following are the isomers of butane: CH3CH2CH2CH3 butane

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Social Science Sample paper 2015 Based on marking sceam issued by CBSE[JST201502]

noreply@blogger.com (J.Sunil Sir) — Sun, 15 Feb 2015 15:02:00 +0000

SUMMATIVE ASSESSMENT – II (2014-15) SOCIAL SCIENCE lass – X [JST201502]

This is based on Sample paper issued by CBSE 2015 for SA- II Session 2015

Very short answers -VSA (1 mark) [Total 8 questions]

1. Who said that ‘When France sneezes, the rest of Europe catches cold.’ ?

2. What is the economic barometer of a country

3. What is FEDECOR ?

4. By whom the Green Belt Movement of Kenya was led by ?

5. What we call the asset bought by the MCC’s in a country

6. Which is the main source of credit for rich urban households?

7. Who announced a vague offer of “Dominion Status” for India in 1929?

8. Which is the most important oil field of Gujrat?

Short answers -VSA (3 mark) [Total 12 questions]

1. How could a Satyagrahi win the battle through non-violence, without seeking vengeance or being aggressive ? Explain.

2. Why were Congress members and Gandhiji keen on women’s symbolic presence? Explain.

3. Which three issues were visualized by Frederic Sorrieu ?

OR, Describe the incident that took place in 1926 in Saigon Native Girls School

4. How does ‘Gobar Gas’ plant provide twin benefits to Indian farmers ? Explain.

5. Why is cotton textile industry majorly concentrated in Maharashtra and Gujarat ? Give any three reasons.

6. State any two uses of limestone and name any two states which are the major producers of limestone.

7. Establish the relationship between democracy and development.

8. Explain the role of the opposition party in democracy ?

9. What does the challenge of deepening of democracy involve ? Explain.

10. In what ways are locally formed consumer protection councils helpful in seeking redressal against unfair trade practices and exploitation?

11. Give an example to show how credit can play a positive and vital role in the life of borrower ?

12. Why are the poorer sections of the society dependent on informal sources of credit ?

Long answers -VSA (5 mark) [Total 8 questions]

1. Explain the reason for the Lahore Session of the congress in 1929 to be called the historical session.

2. ‘Socially and politically, a landed aristocracy was the dominant class in Europe in the 19th century’. Support the statement with suitable facts.

OR,

3. Name the fuel which is most abundantly available fossil fuel in India. Describe its major forms.

4. How is nuclear or atomic Energy obtained ? Write any one use of it. Which minerals are used to obtain this energy and mention any two states where these minerals are found?

5. What are interest groups ? Explain their significance.

6. How can government play a major role in making globalisation a fair deal for all ? Explain any five points.

7. Describe the drawbacks of globalization ?

8. Suggest any five measures to reform financial position of the political parties in India.

Short Answer-SA (3 Marks)-Map Questions [Total 2 questions]
1. Two items A and B are shown in the given political outline map of India. Identify these items with the help of following information and write their correct names on the lines marked on the map :

(i) An Iron and Steel Plant.

(ii) The place where Congress Session was held in 1929.

(iii) The place where declaration of Purna Swaraj was formalized.

2. On the same political outline map of India, locate and label the following items with appropriate symbols

(iv) Srinagar : North terminal of North-South Corridor

(v) Champaran : Famous of the movement of Indigo Planters.

(vi) Namrup : Thermal Power Plant

Solved Sample paper issued by CBSE 2015 for SA- II Session 2015

SUMMATIVE ASSESSMENT – II (2014-15) SOCIAL SCIENCE lass – X [JST201501]

10th Sample Paper SA2 issued by CBSE (for 2015)

noreply@blogger.com (J.Sunil Sir) — Sun, 25 Jan 2015 13:57:00 +0000

10th SSt. SA2 Sample Paper issued by CBSE 2015 Download File
X Maths Sample Paper SA2 issued by CBSE (for 2015)   Download File
X Science SA2 Sample Paper issued by CBSE 2015) Download File
X English Com Sample Paper SA2 by CBSE 2015   Download File
X English Language _ Literature Sample Paper 2015   Download File
Solved papers for CBSE Board Exam   Download File

CBSE ADDA: 9th Natural Resources-Questions from recent Board Exam with answer

noreply@blogger.com (J.Sunil Sir) — Sun, 18 Jan 2015 08:18:00 +0000

Question: Water is known as ‘A Wonder Liquid’. Justify this statement by giving any two reasons
Ans : Water is known as ‘A Wonder Liquid’ because most of the chemical reaction is only possible due to water. Living organism animals, plants, microorganisms, human beings mainly contain water that makes life possible on the earth. Environment temperature, rainfall etc are maintained by water.

Question: The overuse of fertilizers and pesticides is harmful for the soil. Why ?

Ans: Destroys soil structure by killing soil microbes that recycle nutrients in the soil. Kills earthworms which help in making rich humus.

Question: (a) What are the two ways by which carbon dioxide is „fixed‟ in our atmosphere.(b) Which gas is produced when glucose molecule breaks down releasing energy ?

Ans: (a) the two ways by which carbon dioxide is fixed in our atmosphere are:

(i) Green plants convert CO2 into glucose in presence of sunlight

(ii) Many marine animals use carbonates dissolved in sea water to make their shells

(b) Carbon dioxide

Question: Explain in how many ways O2 is used up from the atmosphere and how it returns back to atmosphere ?

Ans: Oxygen from the atmosphere is consumed by the humans and plants for respiration, and vehicles, factories etc.for combustion.Respiration and combustion release CO2, and this CO2 is used by the plants for photosynthesis.Plants create Oxygen with photosynthesis.

For full study

CBSE ADDA: 9th Natural Resources-Questions from recent Board ...: Question: Why plants do not utilize nitrogen directly from atmosphere? Ans. Most of the plants cannot utilise nitrogen directly from the...

CBSE NCERT Class 9th natural resources Solved Board Questions

Question Paper class 10 CBSE SA-1 for 2015

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CBSE 2014 – 2015 Class 10 SA1 Question Papers are given below.

(CBSE 2014 - 2015 Class 10 SA1 Question Papers – Science

CBSE 2014 – 2015 Class 10 SA1 Question Papers – Social Science

CBSE 2014 – 2015 Class 10 SA1 Question Papers – Maths

CBSE 2014 – 2015 Class 10 SA1 Question Papers – Hindi

CBSE 2014 – 2015 Class 10 SA1 Question Papers – English

CBSE 2014 – 2015 Class 10 SA1 Question Papers – Sanskrit

Social Science Question Paper 9 CBSE SA-1 2014

noreply@blogger.com (J.Sunil Sir) — Sat, 20 Sep 2014 19:00:00 +0000

9th SA-1 Original CBSE Question Paper of Social Science 2014 Exam conducted in different CBSE schools

IX SA-1 Original Paper Social Science 2014-1 Download File

IX SA-1 Original Paper Social Science 2014-2 Download File

For more paper visit Original Papers

CBSE 2014 - 2015 Class 09 SA1 Question Papers – Science

CBSE 2014 – 2015 Class 09 SA1 Question Papers – Social Science

CBSE 2014 – 2015 Class 09 SA1 Question Papers – Maths

CBSE 2014 – 2015 Class 09 SA1 Question Papers – Hindi

CBSE 2014 – 2015 Class 09 SA1 Question Papers – English

CBSE 2014 – 2015 Class 09 SA1 Question Papers – Sanskrit

10th and 9th SA-1 Sample Paper -2014-15

noreply@blogger.com (J.Sunil Sir) — Tue, 09 Sep 2014 14:47:00 +0000

IX	STD-9 SA-1 MODEL PAPER- ENGLISH.pdf
IX	STD-9 SA-1 MODEL PAPER- HINDI.PDF
IX	STD-9 SA-1 MODEL PAPER- MATHS.pdf
IX	STD-9 SA-1 MODEL PAPER- SCIENCE.PDF
IX	STD-9 SA-1 MODEL PAPER- SST.pdf
IX	STD-9 SA-1 MODEL PAPER- SANSKRIT.PDF
IX	STD-9 SA-1 MODEL PAPER- IT.pdf
X	STD-10 SA-1 MODEL PAPER- ENGLISH.pdf
X	STD-10 SA-1 MODEL PAPER- HINDI.PDF
X	STD-10 SA-1 MODEL PAPER- MATHS.pdf
X	STD-10 SA-1 MODEL PAPER- SCIENCE.pdf
X	STD-10 SA-1 MODEL PAPER- SST.pdf
X	STD-10 SA-1 MODEL PAPER- SANSKRIT.PDF
X	STD-10 SA-1 MODEL PAPER- IT.pdf

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Solved Sa-1 classs X and IX

Magnetic effect of current class 10 Eduscore Questions with solution

noreply@blogger.com (J.Sunil Sir) — Tue, 22 Jul 2014 16:24:00 +0000

Question :1 A proton enters in a straight line in a uniform magnetic field along the field direction. How will its path and velocity change?

Answer: As the proton is moving along the field direction, thus no force acts on it and the velocity and the path will not change. It will keep on moving with the same speed along the field direction.

Question :2 A positive charge is moving vertically upwards in magnetic field towards south. In which direction will it be deflected?

Answer: If positive charge is moving upwards the corresponding current is also upwards, the magnetic field is towards south. Using Fleming’s left hand rule force is towards east and deflection towards east.

Question :3 Free electrons always keep on moving in the conductor. Even then no magnetic force acts on them in a magnetic field. Why?

Answer: In the absence of external potential difference the motion of the electrons inside the conductor is totally random. Thus although the electrons are moving their velocity comes out to be zero. Thus, magnetic force which acts on them will always be zero.

Question :4 What is the nature of the magnetic field generated by a current carrying straight conductor?

Answer: The magnetic field of long straight conductor is in the circular magnetic lines of force. The center of these imaginary lines lies on the wire. The plane of magnetic lines of force is perpendicular to the length of the conductor and is given by right hand thumb rule.

Question :An electron and proton enter a uniform magnetic field perpendicular to the direction of the field with same velocity. Will the force on them be same?

Answer: Yes, the force acting on them is equal in magnitude but the direction of force will be different[opposite]. Also, the radius of the path followed by both will be different as radius is directly proportional to the mass of the charged particle.

Question :6 What is magnetic lorentz force?

Answer: The force acting on the charge particle moving inside the magnetic field is called magnetic Lorentz force. F = qvB sin q is the magnitude of the force.

Question :7 Under what conditions electron moving in the uniform magnetic field experiences maximum force?

Answer: The electron experience maximum force when moving inside the magnetic field if the velocity of the electron is perpendicular to the direction of the magnetic field intensity.

Question :8 Under what condition the force acting on the charge particle in the magnetic field of intensity B minimum?

Answer: The force will be minimum if the charge particle moves collinear with the direction of magnetic field intensity i.e. either parallel to the field or antiparallel to the magnetic field.

Question :9 An electron is projected with its velocity in the direction of the magnetic field. Will its motion be affected?

Answer: No the motion of the electron will not be affected by the magnetic field as the charge particle moves parallel to the direction of the magnetic field the force acting on the charge particle is zero.

Question :10 Why to solenoid tends to contract when current passes through it?

Answer: When current flows through the solenoid the current in the adjacent turns is parallel to each other. Since parallel currents attract each other they tend to come closer. Thus, solenoids tends to contract when current flows through it.

9th Biology CBSE Guess paper for SA-1

noreply@blogger.com (J.Sunil Sir) — Fri, 04 Jul 2014 17:27:00 +0000

1.State the reason of introducing Italian bee variety in bee farms.	1
2. State one demerit with composite fish culture system.	1
3. State one importance of photo period in agriculture.	1
4. Name one micronutrient and one macronutrient which plants take from the soil.	1
6.What is meant by the term green manure ? State its role in agriculture.	2
7.State two functions of Vacuoles in a plant cell.	2
8.List two characteristics of cork cells which help them to function as protective tissue ?	2
9. What is composite fish culture system ? State one merit and one demerit of such a system	2
10. Name the energy currency of the cell. Which cell organelle releases this currency?	2
11. List any two methods adopted in farming for the health of the cattle.	2
12. List the two types of food requirements of dairy animals.	2
13. List two similarities between Mitochondria and Plastids. 2	2
14. Name the connective tissue which helps in repair of tissues. State where this tissue is found.	2
15. What is manure? How is it prepared? State its role in changing the quality of soil of a field having excess of: (i) Sand (ii) Clay.	3
16. Make a table to show the difference between Striated, Unstriated and Cardiac Muscles on the basis of their structure and location in the body.	3
17. Distinguish between intercropping and mixed cropping. List any two advantages of intercropping over mixed cropping.	3
18. State three management practices that are common in dairy and poultry farming.	3
19. Name the tissue responsible for flexibility in plants? How would you differentiate it from other permanent tissues?	3
20. List any three desirable characters of bee varieties suitable for honey production?	3
21. List any three ways by which the insect pests attack the plants.	3
Ans: Insect pests destroy crops by the following ways:
Sucking the cellular sap from various plant parts
Cutting the roots, stem, and leaves of plants
Boring into stems and fruits
22. What is a connective tissue? State it’s any two basic components. Differentiate between Ligament and Tendon.	3
23. (a) What are Lysosomes ? Why are they called suicide bags of a cell ?
(b) What happens to the dry raisins when we put them in plain water for some time ? State the reason for whatever is observed. What would happen if these raisins are not placed in concentrated salt solution ?	5
24. (a) What is endoplasmic reticulum ?	5
(b) Describe its structure.
(c) Name the two types of endoplasmic reticulum.
(d) What crucial role does it play in the liver cells of vertebrates?
(e) What is membrane biogenesis?
25. (a) What is a cell ? Why is a cell called the structural and function unit of life ?	5
(b) Why is the plasma membrane called a selectivity permeable membrane ?

IX CBSE Solved Science Practice papers SA-1
TOPPERS SAMPLE PAPER – I	Answer
TOPPERS SAMPLE PAPER - 2	Answer
TOPPERS SAMPLE PAPER - 3	Answer
TOPPERS SAMPLE PAPER – 4	Answer
TOPPERS SAMPLE PAPER – 5	Answer
TOPPERS SAMPLE PAPER – 6	Answer
TOPPERS SAMPLE PAPER – 7	Answer
TOPPERS SAMPLE PAPER – 8	Answer
TOPPERS SAMPLE PAPER – 9	Answer
TOPPERS SAMPLE PAPER – 10	Answer
Practice papers
TOPPERS SAMPLE PAPER – 11	Answer
TOPPERS SAMPLE PAPER – 12	Answer