Which one of the following mineral elements plays an important role in biological nitrogen fixation?

Copper

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Manganese

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Zinc

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Molybdenum

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Solution

The correct option is D Molybdenum
Molybdenum is a component of nitrogenase and nitrate reductase involved during $N_{2}$ fixation. Copper is essential for photosynthesis and respiration. Zinc is involved in synthesis of auxin. Manganese is activator of enzymes involved in nitrogen metabolism.

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