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Question

Most of the plants obtain or absorb nitrogen from soil in the form of

A
Free nitrogen gas
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B
Nitric acid
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C
Nitrite
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D
Nitrates
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Solution

The correct option is C Nitrates
Most abundant gas in the atmosphere is nitrogen but it is a very stable form and cannot be used by plants directly. Most of the plants absorb nitrogen from the soil as nitrates and then internally convert it to nitrite and ammonium forms. The process of conversion of nitrate to ammonium form in plants is called nitrate assimilation.
So, the correct answer is option D.

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