Discussion
Nitrogen is taken by plants in the form of
Answer: C
Plants take up nitrogen mainly as Nitrate.
Roots absorb nitrogen from the soil water chiefly as nitrate ions (\(NO_{3}^{-}\)), and to a lesser extent as ammonium ions. Nitrifying bacteria in the soil convert ammonium into nitrate, and inside the plant nitrate is reduced again and built into amino acids and proteins.
Chloride is a chlorine ion and carries no nitrogen. Plants cannot use nitrogen oxides from the soil, and nitric acid is not absorbed as such; it would simply dissociate into nitrate in the soil water.
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