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The product(s) of reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are

1. Nitrate alone
2. Ammonia and oxygen
3. Ammonia and hydrogen
4. Ammonia alone

Correct answer: Ammonia and hydrogen

Solution

Nitrogenase in legume root nodules reduces atmospheric nitrogen to ammonia, which the plant can assimilate. During this process, some electrons also reduce protons to hydrogen gas, so both ammonia and hydrogen are produced.

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