Page 222 - NCERT Science Class 10 English Medium

(c) Goat, cow and elephant

(d) Grass, fish and goat
3. Which of the following are environment-friendly practices?
(a) Carrying cloth-bags to put purchases in while shopping
(b) Switching off unnecessary lights and fans
(c) Walking to school instead of getting your mother to drop you on her scooter
(d) All of the above
4. What will happen if we kill all the organisms in one trophic level?
5. 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?
6. What is biological magnification? Will the levels of this magnification be different at
different levels of the ecosystem?
7. What are the problems caused by the non-biodegradable wastes that we generate?

8. If all the waste we generate is biodegradable, will this have no impact on the
environment?
9. Why is damage to the ozone layer a cause for concern? What steps are being taken
to limit this damage?

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