Question

Plants cannot use nitrogen directly from the soil. Briefly explain why.

Answer 1

A plant can not use atmospheric nitrogen directly because it is present in free gaseous form in the atmosphere whereas plants are capable of absorbing N2 in the form of Nitrogen compounds like Nitrites and nitrates only from the soil, which is converted by the microorganisms in the soil.

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Answer 2

Explanation:

they cannot take nitrogen in gas form they retake it by nitrogenous salts form this is converted by a microorganisms which is present in the nodules of legumenous plants that is rhizobium this converts athe nitrogen and provides to plant there is a symbiotic relation between plant and the rhizobium