1.

Nitrogen is absorbed by plants in form ofA. `NO_(3)^(-)`B. `NH_(3)`C. `NO_(2)^(-)`D. both a and c

Answer» Correct Answer - D
Plants obtain nitrogen from soil as `NO_(3)^(-)` (nitrate), `NH_(4)^(+)` (ammonium) and `NO_(2)^(-)` (nitrite) ions. Nitrate and nitrite are reduced to ammonium state which is then incorporated into amino acids, proteins and other organic substances.


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