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 hit the nail on the head

To hit the target
To settle the old score
To guess right
To catch someone napping

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Idiom
Mutation is

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

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