Question

Why plants cannot use the nitrogen from the soil directly

Answer 1

Answer:

because there roots are too deep to use nitrogen

Explanation:

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Answer 2

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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.