A) fixation of nitrogen in legumes
B) fixation of atmospheric nitrogen
C) conversion from nitrate to nitrite in legumes
D) conversion from ammonium to nitrate in soil
Correct Answer: A
Solution :
The enzyme nitrogenase is required, for the process of biological nitrogen fixation only. Fixation of atmospheric nitrogen occur through other route also. Neither nitrification (conversion of ammonium to nitrate) nor conversion of nitrate to nitrite require nitrogenase.
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