Which one of the following mineral elements plays an important role in biological nitrogen fixation :
A
Copper
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B
Manganese
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C
Zinc
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D
Molybdenum
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Solution
The correct option is D Molybdenum Plants obtain molybdenum in the form of molybdate ions(MoO2)+2. It is a component of several enzymes, including nitrogenase and nitrate reductase both of which participate in nitrogen metabolism.