Question: 6 . Plants can take up both nitrate ( NO 3 - ) and ammonium ( NH 4 + ) ions from the soil. But

6. Plants can take up both nitrate (NO3-) and ammonium (NH4+) ions from the soil. But only NH4+can be used directly to synthesize N-containing compounds. Any NO3- that is taken up must be re-reduced to NH4+. Explain why nitrogen needs to be in the NH4+form?

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