Assertion (A) :Ozone is destroyed by solar radiation in the upper stratosphere. 
Reason (R) : Thinning of the ozone layer allows excessive UV radiations to reach the surface of earth. 
(i) Both A and R are correct, and R is the correct explanation of A. 
(ii) Both A and R are correct, but R is not the correct explanation of A. 
(iii) Both A and R are not correct. 
(iv) A is not correct but R is correct. 

<p>This is a Assertion Type Questions as classified in NCERT Exemplar</p><p>Option (iv)</p><p>i.e., A is not correct, but R is correct since ozone in the stratosphere is a product of ultraviolet radiations falling on oxygen molecules. The main cause of ozone layer depletion is the release of CFCs i.e., freons. With the depletion of the ozone layer, more ultraviolet radiation filters into the troposphere. These radiations lead to ageing of skin, cataract, sunburn, skin cancer etc.&nbsp;</p>

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