Page No 261:
Question 1:
What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
Page No 264:
Question 2:
How can you help in reducing the problem of waste disposal? Give any two methods.
Page No 264:
Question 1:
Which of the following groups contain only biodegradable items?
(a) Grass, flowers and leather
(b) Grass, wood and plastic
(c) Fruit-peels, cake and lime-juice
(d) Cake, wood and grass
Page No 265:
Question 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?
Page No 265:
Question 6:
What is biological magnification? Will the levels of this magnification be different at different levels of the ecosystem?
Page No 265:
Question 7:
What are the problems caused by the non-biodegradable wastes that we generate?
Page No 265:
Question 8:
If all the waste we generate is biodegradable, will this have no impact on the environment?
Page No 265:
Question 9:
Why is damage to the ozone layer a cause for concern? What steps are being taken to limit this damage?
