A) Nitrobacter bacteria
B) Nitrocystis bacteria
C) Pseudomonas bacteria
D) Both (a) and (b)
Correct Answer: D
Solution :
Nitrifying bacteria: Nitrosomonas and Nitrococcus obtain energy by oxidising ammonia to nitrite. \[NH_{4}^{+}+2{{O}_{2}}\xrightarrow{{}}NO_{2}^{-}+2{{H}_{2}}O+\text{energy}\] Notrocystis and Nitrobacter oxidise nitrites to nitrates \[2N{{O}_{2}}+{{O}_{2}}\xrightarrow{{}}2NO_{3}^{-}+\text{energy}\]
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