Biological nitrogen fixation is the

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reduction of nitrogen to ammonia by living organisms.

oxidation of nitrogen to ammonia by living organism.

conversion of nitrogen to ammonia by UV radiation.

conversion of ammonia to nitrogen by electrical discharge.

answer is A.

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Detailed Solution

Biological nitrogen fixation is a process in which nitrogen gas ( $N_{2}$ ) from the atmosphere is incorporated into the tissue of certain plants. Only a selected group of plants is able to obtain N in this way, with the help of soil microorganisms.

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