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Q.

UV-B radiation causes which of the following?

(a) Damage to DNA

(b) Aging of skin

(c) Skin cancer

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a

Only (a) and (b) 

b

Only (b) and (c)

c

Only (a) and (c)

d

(a), (b) and (c)

answer is D.

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Detailed Solution

UV-B damages DNA and mutation may occur. It causes aging 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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