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Question

Why plants cannot absorb molecular nitrogen from the atmosphere?

A
Nitrogen is toxic
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B
Nitrogen is highly reactive
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C
Nitrogen is highly stable
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D
Abundance in the atmosphere inhibits absorption
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Solution

The correct option is C Nitrogen is highly stable
Plants require nitrogen but cannot absorb it directly because the strong triple bond between the N atoms in N2 molecule makes it stable and inert.
Nitrogen fixation is the process wherein N2 is converted into
soluble form by nitrogen fixing bacteria.

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