First slide

Metabolism of Nitrogen

Question

The bacteria involved in nitrification step of nitrogen cycle is:

Easy

A

Nitrobacter which is a chemoautotroph
B

Nitrococcus which is a heterotroph
C

Pseudomonas which is a chemoautotroph
D

Rhizobium which is symbiont

Solution

Ammonia is first oxidised to nitrite by the bacteria Nitrosomonas and/or Nitrococcus. The nitrite is further oxidised to nitrate with the help of the bacterium Nitrobacter. These steps are called nitrification. These nitrifying bacteria are chemoautotrophs.

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