Which one of the following elements plays an important role in biological nitrogen fixation?
A
Molybdenum
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B
Manganese
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C
Copper
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D
Zinc
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Solution
The correct option is A Molybdenum Molybdenum is required for nitrogen fixation in plants. Nitrate metabolism depends upon enzyme nitrate reductase. It is an activator of nitrate reductase. therefore, the element is important for nitrogen fixation.