Multiple choice

A free living anaerobic nitrogen fixing bacteria is:

  1. clostridium

  2. acetobactor

  3. azotobactor

  4. nostoc
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A Correct answer
Explanation

Clostridium is a genus of anaerobic, free-living bacteria that includes species capable of fixing atmospheric nitrogen. Unlike Rhizobium (which forms symbiotic relationships with legumes) or Azotobacter (which is aerobic), Clostridium species can fix nitrogen independently in anaerobic conditions. These bacteria play important roles in soil nitrogen cycling, particularly in waterlogged or oxygen-poor environments.

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