Nitrates and nitrites present in the soil are changed into ....... by micro-organisms.
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Absorption of nitrate by plant roots from the soil is a carrier-mediated, active and energy-dependent process. The nitrates absorbed by plant roots get converted to amino acids and amides before incorporating into proteins and other macromolecules. Reduction of nitrate into ammonia is called nitrogen assimilation. The reaction is catalysed by enzyme nitrite reductase.