1.Define environment. What are the two components of environment?

2.What is biogeochemical cycle? Name four nutrients, which are recycled?

3.Differentiate biodegradable and non-biodegradable substances with examples.

4.Define ecosystem and what are the components of ecosystem?

5.Give example of abiotic component of ecosystem.

6.Give two artificial and two natural system of ecosystem.

7.Define trophic level. Write the trophic level of carnivores, herbivores and producers.

8.How are consumers classified? Give example of two organisms of each group.

9.How do microorganisms help in nutrient cycling?

10.Give two functions of ecosystem.

11.Why should not be a food chain more than four steps?

12.Define ten percent law of energy transfer.

13.What percent of light energy do producers capture?

14.If 2000 calories of solar energy falls on earth surface, calculate the amount of energy received at producer, herbivore and carnivore level.

15.Which type of food habit provides more energy - vegetarian or no vegetarian and why?

16.Define food web. What is the advantage of food web?

17.What is the direction of flow of energy and nutrient?

18.What is biological magnification or bio concentration? Explain this giving an example.

19.Define ecological pyramid. What does ecological pyramid represent?

20.Which one is having highest concentration of pesticides- water, plants, man and fish?

21.Give an example of food chain and state the different trophic level in it.

22.Briefly describe the formation of ozone layer. How is it beneficial for organisms?

23.Expand- CFC, UNEP.

24.Give example of two cases where CFC used.

25.How do nonbiodegradable substances harmful for us?

26.What are your suggestions in reducing the problems of waste disposal?

27.What steps can be taken to limit the damage to the ozone layer?