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Question 1. Why are some substances biodegradable and some non-biodegradable?
Question 2. Give any two ways in which biodegradable substances would affect the
environment.
Question 3. Give any two ways in which non-biodegradable substances would affect
the environment.
Question 1. What are trophic levels? Give an example of a food chain and state the
different trophic levels in it.
Question 2. What is the role of decomposers in the ecosystem?
Question 1. What is ozone and how does it affect any ecosystem?
Question 2. How can you help in reducing the problem of waste disposal? Give any
two methods
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
Question 2. Which of the following constitute a food-chain?
(a) Grass, wheat and mango
(b) Grass, goat and human
(c) Goat, cow and elephant
(d) Grass, fish and goat
Question 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
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