class 10 holiday HW
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1
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Name the component of blood that helps in the formation of
blood clot in the event of a cut.
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1
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2
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Which pigment is responsible for the transport of
nutrients, respiratory gases, metabolites, hormones and waste products?
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1
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3
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Select two non-biodegradable substances from the following
wastes generated in a kitchen: spoilt food, paper bags, milk bags, vegetable
peels, tin cans, used tea leaves.
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1
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4
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Distinguish between biodegradable and non-biodegradable wastes.
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1
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5
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List two natural ecosystems.
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1
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6
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List two biotic components of a biosphere.
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1
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7
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The depletion of ozone layer is a cause of concern. Why?
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1
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8
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What will be the amount of energy available to the
organism of the 2nd trophic level of a food chain, if the energy
available at the first trophic level is 10,000 joules?
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1
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9
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The first trophic level in a food chain is always a green
plant. Why?
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1
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10
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The following organisms form a food chain. Which of these
will have the highest concentration of non-biodegradable chemicals? Name the
phenomenon associated with it.
Insects, Hawk, Grass, Snake, Frog. |
1
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11
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List two components of an ecosystem.
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1
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12
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Name the phenomenon in which non-biodegradable chemicals
get accumulated progressively at each trophic level of a food chain.
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1
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13
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What is the role of decomposers in the ecosystem?
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1
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14
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Write the full name of the group of compounds mainly responsible
for the depletion of ozone layer.
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1
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15
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Expand the term: U.N.E.P.
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1
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16
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Explain the mechanism of gaseous exchange between tissues
and blood.
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2
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17
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Why are the walls of ventricles thicker than the auricles
?
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2
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18
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Government of India is imposing ban on the use of
polythene bags for shopping. List four advantages of using cloth or jute bags
over polythene bags.
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2
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19
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Construct an aquatic food chain showing four trophic
levels.
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2
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20
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List the three kinds of blood vessels of human circulatory
system and write their functions in tabular form.
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3
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21
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Draw a diagram of human excretory system and label
kidneys, ureters on it.
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3
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22
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What is an ecosystem? List its two main components. We do
not clean natural ponds or lakes but an aquarium needs to be cleaned
regularly. Why is it so? Explain.
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3
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23
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“Damage to the ozone layer is a cause for concern.”
Justify this statement. Suggest any two steps
to limit this damage. |
3
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24
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(a) Explain how does the exchange of gases occur in plants
across the surface of stems, roots and leaves.
(b) How are water and minerals transported in plants? |
5
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