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. To pay one back in the same coin

To give a word of encouragement or praise to another
To offer another polite attention
To retaliate
To provoke a person to quarrel

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Idiom
Mutation is

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

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