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Nitrogen cycle - class-X

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Multiple Choice

Reaction carried out by $N _2$ fixing microbes include
$2NH _3 + 3O _2 \rightarrow 2NO _2^- + 2H^+ + 2H _2O$            (i)
$2NO _2^- + O _2 \rightarrow 2NO _3^-$                                       (ii)
Which of the following statements about these equations is not true?

  1. Step (i) is carried out by Nitrosomonas or Nitrosococcus
  2. Step (ii) is carried out by Nitrobacter
  3. Both step (i) and (ii) can be called nitrification.
  4. Bacteria carrying out these steps are usually photoautotrophs.
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