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3. Choose the correct option from the following: U 1
(a) If both Assertion and Reason are correct and Reason is the
correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not
the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If Assertion is incorrect but Reason is correct.
(e) If Assertion & Reason both are incorrect.
Assertion (A): Greenhouse effect plays a very important role in
maintaining life on the earth.
Reason (R): It provides the right temperature on the earth.
4. Write down three ways how you can control air pollution. R 3

5. Write down the causes of the greenhouse effect. Explain them. U 5

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