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  4. Which of the following is not one of the prime health risks associated with greater UV radiations through the atmosphere due to depletion of stratospheric ozone?

Q. Which of the following is not one of the prime health risks associated with greater UV radiations through the atmosphere due to depletion of stratospheric ozone?

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Solution:

Ultraviolet radiations are of three types - UV-C (100 - 280 nm), UV-B (280 - 320nm) and UV-A (320 - 390nm). Shorter ultraviolet radiations (UV-C) are absorbed by the atmosphere. The longer ones (UV-A), are not much harmful. The intermediate or UV-B are harmful as well as capable of deep penetration. Thinning of ozone layer increases the amount of UV-B radiations reaching the earth. UV-B radiations damage skin cells, cause ageing of skin, skin cancer and eyedamage.