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. Some people have a habit of wearing their heart on their sleeve.

saying something which is not to be taken seriously
wasting their time on unnecessary details
avoiding being friendly with others
exposing their innermost feelings to others

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Idiom
Mutation is

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

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