Q. What is the problem caused by the non-biodegradable wastes that we generate?

Q. Give any two ways in which biodegradable substances would affect the environment.

Q. If all the waste we generate is biodegradable, will this have no impact on the environment?

Q. What will happen if we kill all the organisms in one trophic level?

Q. What is ozone and how does it affect any ecosystem?

Q. Which of the following groups contain only biodegradable items?

1. Wood and grass
   
2. Glass, flowers and leather
3. Both B and C
4. Fruit-peels, cake and lime-juice

Q. What is biological magnification? Will the levels of this magnification be different at different levels of the ecosystem?

Q. How can you help in reducing the problem of waste disposal? Give any two methods.

Q. What is the role of decomposers in the ecosystem?

Q. Give any two ways in which non-biodegradable substances would affect the environment.

Q. Which of the following are environment-friendly practices?

1. Carrying cloth-bags to put purchases in while shopping.
2. Walking to school instead of getting you mother to drop you on her scooter.
3. Switching off unnecessary lights and fans.
4. All of the above.

Q. Why is damage to the ozone layer a cause for concern? What steps are being taken to limit this damage?

Q. Will the impact of removing all the organisms in a trophic level be different for different trophic levels? Can the organisms of any trophic level be removed without causing any damage to the ecosystem?