Question

what du you mean by nitrogen fixation ?

Answer 1

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Nitrogen fixation is a chemical process that converts atmospheric nitrogen into ammonia, which is absorbed by organisms. Nitrogen fixation is essentially converting atmospheric nitrogen into a form that plants can more readily utilize.
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Answer 2

Fixing of Nitrogen or using nitrogen for consumption is called nitrogen fixation. It takes place in leguminous plants by the use of Rhyzobium bacteria.