Question

Where does denitrification happen?
a. at the roots of plants
b. in the air
c. in deep soil or anoxic aquatic sediment
d. all of the above

Answer 1

Denitrification is anaerobic process i.e it takes place in the absence of oxygen. So it mostly occurs in the deep substrata of the soil, or in areas of stagnant water.

Answer 2

C appears to be the correct option.