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| The absorption of which of the following will damage DNA and cause mutations? |
UV-B UV-A UV-C Radiowaves |
| UV-B |
| Ultraviolet radiations are of three types- UV-C ( 100-280nm) , UV-B(280-320nm) and UV-A(320- 390nm). Shorter UV radiations (UV-C) are absorbed by the atmosphere. The longer ones are not 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 and cause ageing of skin and skin cancer. The absorption of UV-B will damage DNA and cause mutations. |
