A) Nitrosomonas and Nitrobacter
B) Azotobacter
C) Rhizobium sp.
D) Thiobacillus denitrificans
Correct Answer: B
Solution :
Nitrification is the phenomenon of conversion of ammonium to nitrate by nitrifying bacteria like Nitrosomonas, Nitrobacter, etc. It occurs in two steps. \[2N{{H}_{3}}+3{{O}_{2}}\xrightarrow[{}]{Nitrosomonas}2NO_{2}^{-}+2{{H}^{+}}\] \[+2{{H}_{2}}O+\]Energy \[2NO_{2}^{-}+{{O}_{2}}\xrightarrow[{}]{Nitrobacter}2NO_{3}^{-}+\] Energy
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