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Standard IX
Biology
Question

Oxidation of nitrite into nitrate is done by
  1. E. coli
  2. Nitrobacter
  3. Pseudomonas
  4. All of the above

A
Nitrobacter
B
All of the above
C
Pseudomonas
D
E. coli
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Solution
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The correct option is B Nitrobacter
The second step (oxidation of nitrite into nitrate) is done mainly by bacteria of the genus Nitrosomonas and Nitrobacter.

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