A free living anaerobic nitrogen fixing soil bacteria is

Options :
  1. Clostridium
  2. Rhizobium
  3. Azotobacter
  4. Streptococcus
Answer and Explanation :-

Answer: Option 1

Explanation:

Rhizobium is symbiotic; Azotobacter is free living aerobic

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The reasoning man who scorns the prejudices of simpletons necessarily becomes the enemy of simpletons he must expect as much, and laugh at the inevitable.
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