15

Maximum time- 30 minutes

Maximum marks-25

1.  What are decomposers? Write their importance with respect to our environment.     (2)

2.  Write the causes of depletion of ozone layer. How can we prevent it?     (3)

3.  Explain the formation of ozone layer.     (2)

4.  Mention three information obtained from the energy flow diagram.     (3)

5.  What are food chains and food webs? Why are smaller food chains better?     (4)

6.  Energy flow in a food chain is unidirectional. Explain     (3)

7.  Give any three methods to reduce the problem of waste disposal.     (3)

8.  Differentiate between natural and artificial ecosystem.     (2)

9.  Write the full form of UNEP.     (1)

10.  Write the names of any two decomposers.     (2)