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Answer:

Ammonia is converted to nitrates by nitrifying bacteria in the soil. Plants absorb nitrates from the soil and use these to build up proteins. ... This ammonia is converted to nitrates by nitrifying bacteria. In some conditions denitrifying bacteria in the soil break down nitrates and return nitrogen back to the air.

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Explanation:

Answer:

Ammonium ions are absorbed by the plant via ammonia transporters. Nitrate is taken up by several nitrate transporters that use a proton gradient to power the transport. Nitrogen is transported from the root to the shoot via the xylem in the form of nitrate, dissolved ammonia and amino acids.

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