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Why are plants not able to use $N_{2}$ directly as a nutrient ?

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The N₂ molecules is too large to enter the root hairs

Most soils are depleted of

N_{2}

as a nutrient

Plants lack the enzymes necessary to convert

N_{2}

into

N O_{2}^{-}

and

N H_{4}^{+}

Plant systems are incapable of carrying out gaseous nitrogen fixation

answer is B.

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Detailed Solution

Plant systems are not designed to carry out gaseous nitrogen fixation, that's why they are assisted by nitrogen fixers to fix gaseous nitrogen from the atmosphere.

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