Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: If earth did not have atmosphere, its average surface temperature would be lower than what is now. Reason: Green house effect of the atmosphere would be absent if earth did not have atmosphere.A) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
B) If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
C) If Assertion is true but Reason is false
D) If both Assertion and Reason are false
Correct Answer: A
Solution :
Earth is heated by suns infrared radiation. The earth also emits radiation most in infrared region. These radiations are reflected back due to heavy gases like 003 by atmosphere. These back radiation keep the earths surface warm at night. This phenomenon is called greenhouse effect. When the atmosphere were absent the temperature of earth falls.
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