Question

. Why a plant does not absorb nitrogen in the atmosphere?

Answer 1

So they have a nitrogen fixing bacteria in their roots like Rhizopus, nostoc etc which converts atmospheric nitrogen into amino acids which are absorbed by plants. Roots absorb nitrogen in the form of nitrates from the soil. Plants do not recognise the atmospheric nitrogen as it is unreactive,

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Answer 2

But plants do not use nitrogen directly from the air. This is because nitrogen itself is unreactive, and cannot be used by green plants to make protein. Nitrogen gas therefore, needs to be converted into nitrate compound in the soil by nitrogen-fixing bacteria in soil, root nodules or lightning.