Assertion (A) : Presently, the global atmosphere is warming up.
Reason (R): The depletion of stratospheric ozone layer has resulted in increase in ultraviolet radiations reaching the Earth.

These questions consist of two statement each, printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses. A. If both Assertion and Reason are true and Reason is a correct explanation of the Assertion. B. If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion. C. If Assertion is true but Reason is false. D. If both Assertion and Reason are false. Assertion: Presently the global atmosphere is warming up. Reason. The depletion of stratospheric ozone layer has resulted in increase in UV radiations reaching earth.

Atmospheric ozone layer which protects us from ultraviolet rays is getting depleted mostly by:

Assertion (A) : The temperature in the thermosphere increases with altitude. Reason (R) : Ozone present in stratosphere absorbs ultraviolet radiation

Assertion : Ozone is destroyed by CFCs in the upper stratosphere. Reason : Ozone holes increase the amount of UV radiation reaching the earth.

Assertion (A) : Ozone is destroyed by solar radiation in upper streatosphere. Reason (R) : Thinning of the ozone layer allows excessive UV radiations to reach the surface of earth.