Expand FOAM. Describe the project of integrated waste water treatment, it it responsible for the upkeep.

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(a) Why is the ozone layer required in the stratosphere? How does it get degraded? Explain
(b) Why is the ozone depletion a threat to mankind?

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Discuss briefly Radioactive wastes.

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Discuss briefly the defunct ships and e-wastes.

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What are the basic characteristics of a modern landfill site. List any three and also mention the reasons for their use.

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What is air pollution? Write the preventive measures for air pollution. 

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Show the effects of man made chemicals on the ozone layer in the stratosphere.

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Seeing a crowd of students in one corner of the school, the principal rushed to see the matter and found some children heating and chasing a small lizard. On seeing the principal, all the children fled to their classes except Alok who requested the principal to arrange for some medical assistance for the injured animal. The principal rewarded Alok for his attitude to save guard our biodiversity.
(i) What do you understand by biodiversity?
(ii) Mention the factors resulting in loss of biodiversity.
(iii) Was Alok an indisciplined boy, who did not run to the class on seeing the principal? What values does the acts promote?

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(a) What depletes ozone in the stratosphere ? How does this affect human life?
(b) Explain biomagnification of DDT in an aquatic food chain. How does it affect the bird population?

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(a) Public transport in Delhi uses CNG since 2002.List the advantages of this fuel policy.
(b) BOD was measured in two different places A and B of a river in the direction of its flow. BOD value was higher at A than B.What do you infer from this observation and why?

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Science & technology have added a number of gadgets to our lives. But they are creating e-waste problem. Geeta read a report on the disposal of these gadgets.
Answer the following questions on the basis of above information:
(i) What values are exhibited by Geeta ?
(ii) What steps can be suggested by her for managing this problem?

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