The conversion of nitrate to nitrogen is called

What is the function of nitrifying bacteria?

Conversion of $NH_{3} \rightarrow NO_{2}^{-} \rightarrow NO_{3}^{-}$ is called:

The process of conversion of $2 NO_{3}^{-} \rightarrow 2 NO_{2}^{-} \rightarrow 2 NO \rightarrow N_{2}O \rightarrow N_{2}$ is called and is carried out by:

The reaction $2 NH_3 + 3 O_2 \rightarrow 2 NO_2^- + 2 H^+ + 2 H_2O$ is carried out by which of the following microorganisms?

Nitrifying bacteria........