A) Both A and R are true and R is the correct explanation of A.
B) Both A and R are true, but R is not the correct explanation of A
C) A is true, but R is false
D) Both A and R are false
Correct Answer: A
Solution :
UV radiation of wavelengths shorter than UV-B, are almost completely absorbed by Earth?s atmosphere, given that the ozone layer is intact. But, UV-B damages DNA and mutation may occur. It causes ageing of skin, damage to skin cells and various types of skin cancers. In human eye, cornea absorbs UV-B radiation and a high dose of UV-B causes inflammation of cornea called snow-blindness, cataract, etc. Such exposure may permanently damage the cornea.
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