A) Zinc
B) Molybdenum
C) Copper
D) Manganese
Correct Answer: B
Solution :
Molybdenum ions are components of several enzymes such as nitrate reductase and nitrogcnase which are involved in biological nitrogen fixation. Nitrate reductase catalyses the reduction of nitrate to nitrite during its assimilation by the plant cell while nitrogen as enzyme converts nitrogen into ammonia in nitrogen fixing organism.
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