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 put one's hand to plough

To take up agricultural farming
Take interest in technical work
None of these
To take a difficult task
To get entangled into unnecessary things

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Idiom
White blood cell act

For clotting blood
As a medium for oxygen transport from lung to tissues
As a defence against infection
As a source of energy

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