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. His hard-earned money has gone down the drain.

has been collected
has been spent
has been looted
has been wasted

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Idiom
Mutation is

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

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