A) Fixation of atmospheric nitrogen
B) Conversion from nitrate to nitrite in legumes
C) Conversion from ammonium to nitrate in soil
D) Fixation of nitrogen in legumes
Correct Answer: D
Solution :
Nitrogenase is an enzyme involved in biological nitrogen fixation. Enzyme nitrate reductase involved in conversion of nitrate to nitrate. Conservation of ammonia of nitrate is carried out by Nitrosomonas and Nilrobacter.
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