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Question: Answered & Verified by Expert
A free-living, anaerobic, nitrogen-fixing bacterium is
BiologyMineral NutritionNEET
Options:
  • A Rhizobium
  • B Streptococcus
  • C Azotobacter
  • D Clostridium
Solution:
2550 Upvotes Verified Answer
The correct answer is: Clostridium
Rhizobium can carry out nitrogen fixation only in a symbiotic state when it forms root nodules with leguminous plants. Azotobacter is a free-living aerobic nitrogen fixer and Clostridium is a free-living anaerobic nitrogen fixer. Streptococcus is saprophytic bacteria.

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