The bacteria involved in nitrification step of nitrogen cycle is:

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Nitrobacter which is a chemoautotroph

Nitrococcus which is a heterotroph

Pseudomonas which is a chemoautotroph

Rhizobium which is symbiont

answer is A.

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Detailed 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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