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Question

Bacteria involved in two-step conversion ammonia into nitrate are
  1. Azotobacter and Achromobacter
  2. Azotobacter and Nitrosomonas
  3. Pseudomonas and Nitrobacter
  4. Nitrosomonas and Nitrobacter

A
Azotobacter and Achromobacter
B
Azotobacter and Nitrosomonas
C
Nitrosomonas and Nitrobacter
D
Pseudomonas and Nitrobacter
Solution
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Nitrification is a process of conversion of ammonium ions to nitrites and nitrites to nitrates. It is a two-step process. The bacteria that carry out this process are called as nitrifying bacteria. Nitrosomonas, Nitrosospira, Nitrosococcus convert ammonia into nitrites. Nitrobacter, Nitrospina, Nitrococcus convert nitrites into nitrates.
Thus, the correct answer is 'Nitrosomonas and Nitrobacter.'

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