NEET Biology question

Not in NEET syllabus

If, by radiation, all nitrogenase enzymes are inactivated, then there will be no

(A)Fixation of nitrogen in legumesCorrect
(B)Fixation of atmospheric nitrogen
(C)Conversion from nitrate to nitrite in legumes
(D)Conversion from ammonium to nitrate in soil

Answer: (A)

Solution

Nitrogenase is required specifically for biological nitrogen fixation. In legumes, this biological fixation occurs via *Rhizobium*'s nitrogenase in root nodules, so inactivating nitrogenase would abolish nitrogen fixation in legumes. (Atmospheric nitrogen fixation can still occur abiologically, e.g. by

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Question ID VK-112756