Nitrogen is absorbed by plants in form of

Options

A. `NO_(3)^(-)`
B. `NH_(3)`
C. `NO_(2)^(-)`
D. both a and c

Answer

D

Explanation

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.