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Question

Which of the following is a physical mutagen for induced mutagenesis in crop plants?

A
X-rays
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B
nitromethyl urea
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C
nitrous acid
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D
ethyl methane sulphonate (EMS)
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Solution

The correct option is A X-rays
Mutation breeding is an important technique in crop improvement. It uses either chemical mutagens or physical mutagen. Different kinds of radiations like X-rays, gamma rays UV rays, which cause mutations are called as physical mutagens. The electromagnetic radiations, like X-rays, penetrate tissues from a few millimetres to many centimetres. This results in mutations.
Few chemical mutagens are ethyl methane sulphonate (EMS), nitrous acid, nitrosoethyl urea, nitromethyl urea, sodium azide etc.

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