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Question

The enzyme responsible for the reduction of molecular nitrogen to the level of ammonia in leguminous root nodule is

A
Nitrogenase
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B
Nitrate reductase
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C
Nitrite reductase
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D
Hydrogenase
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E
Carboxylase
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Solution

The correct option is A Nitrogenase
Nitrogenase is the enzyme present in root nodule bacteria, which is responsible for reduction of free nitrogen into ammonia. Nitrate reductase and nitrite reductase are the nitrogen assimilation enzymes. These are plant enzymes required for assimilation of nitrogen, that has been absorbed from soil in the form of nitrates.

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