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