The molecular action of UV light is mainly reflected through:

Photodynamic action

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Formation of pyrimidine

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Formation of sticky metaphases

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Destruction of hydrogen bonds between DNA strands

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Solution

The correct option is D Destruction of hydrogen bonds between DNA strands
UV rays are highly injurious to living organisms since DNA and proteins of living organisms preferentially absorb UV rays and its high energy breaks the chemical bonds of hydrogen within these molecules. UV damages DNA and mutation may occur. It causes ageing of the skin, damage to skin cells and various types of skin cancers.

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