Idiom
For each of the following sentences four alternatives are given. You are required to choose the correct meaning of the idiom or phrase given or underlined in the sentence. The class could not keep a straight face on hearing the strange pronunciation of the new teacher.

remain mute
remain disturbed
remain serious
remain silent

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Idiom
Mutation is

a change which affects the offspring of F2 generation only
a change which affects the parents
a change that is inherited
a factor responsible for plant growth

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