The bacteria which convert $NO_3^- \rightarrow$ free $N_2$ are called as:

Nitrates are converted to nitrogen by

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:

Which of the following is present in the maximum amount in the atmosphere?

Complete the nitrification process equation:
........... $+$ .......... $\rightarrow 2NO_2^- + 2H^+ + 2H_2O$

Which option is correct to match section $A$ with section $B$?

Section $A$	Section $B$
$(i)$ Nitrosomonas	$(a)$ Nitrite $\rightarrow$ Nitrate
$(ii)$ Agrobacterium	$(b)$ Nitrogen fixative bacteria
$(iii)$ Rhizobium	$(c)$ $NO_3^- \rightarrow N_2$
$(iv)$ Nitrobacter	$(d)$ Ammonia $\rightarrow$ Nitrite
	$(e)$ Denitrifying bacteria