Question:

Nitrification is carried out sequentially by

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Nitrification: \[ \boxed{ NH_4^+ \rightarrow NO_2^- \rightarrow NO_3^- } \] \[ \boxed{ \textit{Nitrosomonas} \rightarrow \textit{Nitrobacter} } \]
Updated On: Jul 23, 2026
  • Nitrosomonas and Nitrobacter
  • Bacillus and Clostridium
  • Methanosarcina and Methanobacterium
  • Pseudomonas only
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The Correct Option is A

Solution and Explanation

Nitrification occurs in two sequential steps: \[ NH_4^+ \xrightarrow{\textit{Nitrosomonas}} NO_2^- \] followed by \[ NO_2^- \xrightarrow{\textit{Nitrobacter}} NO_3^-. \] Hence, \[ \boxed{\textit{Nitrosomonas} \text{ and } \textit{Nitrobacter}} \] carry out nitrification sequentially. Therefore, \[ \boxed{(A)} \]
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