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Question

In the process of nitrification, ammonia is first oxidized to nitrite by

  1. Nitrosomonas and Nitrosococcus
  2. Nitrosomonas and Nitrobacter
  3. Pseudomonas and Nitrosococcus
  4. Pseudomonas and Thiobacillus

A
Pseudomonas and Thiobacillus
B
Nitrosomonas and Nitrobacter
C
Nitrosomonas and Nitrosococcus
D
Pseudomonas and Nitrosococcus
Solution
Verified by Toppr

First step, ammonium ions are oxidised to nitrites. Nitrosomonas are the most important agents of oxidation of ammonia to nitrite in soil. Certain other bacteria are Nitrosococcus , Nitrosolobus ,etc.
Second step , oxidation of nitrite to nitrate takes place by Nitrobacter.
So the correct option is "Nitrosomonas and Nitrococcus".

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