Q. 215.0( 1 Vote )

i. State two advantages of conserving (a) forests, and (b) wildlife.

ii. Explain two main advantages associated with water harvesting at the community level.

iii. In the following food chain, 100 J of energy is available to the lion. How much energy was available to the producer?

Plants Deer Lion


i. Write the full name of the group of compounds mainly responsible for the depletion of ozone layer.

ii. prepare a list of five activities that you perform daily in which natural resources can be conserved or energy utilisation can be minimised.

Answer :

i. (a) To conserve biodiversity.

Explanation: The loss of diversity my lead to biological instability.

Forests also are the homes for many animals and also give us valuable forest products.

(b)We need to conserve wildlife to maintain the ecological stability.

(Explanation: The animals also provide us with various economical products and the livelihood of many people depends on the both.)

ii. *It can provide year-round supply of dinking water to the community.

(Explanation: The water harvested can be used during the drier season)

*Groundwater is protected from contamination by human and animal waste.

iii. 10000 J of energy was available to the producer.

(Explanation- Only 1/10th of energy is passed on to the next energy level. Therefore 1/10th of 10000 is 1000 J is available for the deer.1/10th of 1000 is 100J is available for the lion.)


i. Chlorofluorocarbons (CFCs)

(Explanations are carbon compounds which destroy the ozone layer by thinning the layer and creating ozone holes)

ii. (i) Using public transport or walking/cycling.

(ii) Using LED bulbs at homes and switching off fans and lights when not in use.

(iii) Taking the stairs instead of the elevator.

(iv) Wearing an extra sweater instead of using a heater on cold days.

(v)Not wasting paper and using less plastic.

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