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During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by

(a) carotene

(b) cytochrome

(c) leghaemoglobin

(d) xanthophyll.
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Ans : (C) leghaemoglobin

Explanation :

The Rhizobium bacteria present in the root nodule of leguminous plants fix the atmospheric nitrogen by an oxygen labile enzyme nitrogenase. The root nodules contain a pigment called leghaemoglobin which prevents the exposure of nitrogenase to oxygen.

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