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Question

Which of the following is a free living aerobic nitrogen fixing bacterium present in the soil?
  1. Nitrosomonas
  2. Rhizobium
  3. Azotobacter
  4. Pseudomonas

A
Pseudomonas
B
Nitrosomonas
C
Azotobacter
D
Rhizobium
Solution
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Azotobacter and Beijerinckia are aerobic free living saprophytic nitrogen fixing bacteria, while Clostridium is anaerobic free living saprotrophic nitrogen fixing bacterium.

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