Match Column - I with Column - II

Answer

D

Explanation

• `NH_3` is converted to `-NO_2^(-)` (nitrite) by nitrifying bacteria such as Nitrococcus.
• Nitrogen fixation is conversion of atmospheric `N_2` to `NH_3` (ammonia). It is carried out by `N_2` fixers such as Rhizobium.
• Thiobacillus carries out denitrification, a process where `NO_2^(-)//NO_3^(-)` is converted to `N_2` .
• Then `NO_2^(-)` is converted to `NO_3^(-)` (nitrate) by nitrfying bacteria called Nitrobacter.