Carefully read the following reactions carried out by nitrifying bacteria. Identify the statement about these equations which is not true.
2NH $_{3}$ +3O $_{2}$ $\to$ 2NO $_{2}^{-}$ +2H $^{+}$ +2H $_{2} O$ ---- (I)
2NO $_{2}^{-}$ +O $_{2}$ $\to$ 2NO $_{3}^{-}$ ---- (II)

Step I is carried out by Nitrosomonas or Nitrosococcus

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Step II is carried out by Nitrobacter

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Both the steps I and II can be called nitrification

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Both the steps occur only in photoautotrophs

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Solution

The correct option is A Both the steps occur only in photoautotrophs
I) In the first step, ammonia is oxidised to nitrites by the action of nitrosomonas and nitrococcus bacteria.
II) In the second step, nitrate is further oxidised to nitrate with the help of nitrobacter and nitrocystis.
Both the reaction is involved in the process of nitrification. These nitrifying bacteria involved are called chemoautotrophs.
So the correct answer is 'Both the steps occur only in photoautotrophs'.

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2 {N H}_{3} + 3 O_{2} ⟶ 2 N O_{2}^{-} + 2 H^{+} + 2 H_{2} O . . . . . (A)

2 N O_{2}^{-} + O_{2} ⟶ 2 N O_{3}^{-} . . . . . . (B)

N_{2}

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