5. Assertion (A) : Ozone is destroyed by solar radiation in upper stratosphere. Reason (R) : Thinning of the ozone layer allows excessive UV radiations to reach the surface of earth. (a) Both A and R are correct and R is the correct explanation of A. (b) Both A and R are correct but R is not the correct explanation of A. (c) Both A and R are not correct. (d) A is not correct but R is correct.

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Environmental Pollution

Environmental pollution occurs due to some unwanted alteration in the surroundings which results in unfavorable effects on all organisms of that surrounding.