Statement A: Ammonia is first oxidised to nitrate by the bacteria Nitrosomonas or Nitrococcus.
Statement B: These nitrifying bacteria are chemoheterotrophs.

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Both statement A and statement B are correct

Both statement A and statement B are incorrect

Statement A is correct but statement B is incorrect

Statement B is correct but statement A is incorrect

answer is B.

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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 by Nitrobacter. These steps are called nitrification. These nitrifying bacteria are chemoautotrophs.

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