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Reaction carried out by N(2) fixing micr...

Reaction carried out by `N_(2)` fixing microbes include
`2NH_(3)+3O_(2)to2NO_(2)^(-)+2H^(+)+2H_(2)O` …(i)
`2NO_(2)^(-)+O_(2)to2NO_(3)^(-)` ….(ii) Which of the following statements about these equations is not true?

A

step (i) is carried out by Nitrosomonas or Nitrococcus

B

step (ii) is carried out by Nitrobacter

C

Both steps (i) and (ii) can be called nitrification

D

Bacteria carrying out these steps are usually photoautotrophs

Text Solution

Verified by Experts

The correct Answer is:
D
Option (d) is not true because the bacteria involved in the process are not photoautotrophs but are chemoautotrophs. These bacteria oxidise inorganic substnces like `NH_(3)` and `NO_(2)` and use the released energy hence are called
chemoautotrophs.
Simultaneously, they help in the conversion of ammonia `(NH_(3))` to absorbable form `(NO_(2)^(-) " and " NO_(3)^(-))` of nitrogen.
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