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Question: Answered & Verified by Expert
The non-symbiotic anaerobic nitrogen fixer is
BiologyMineral NutritionNEET
Options:
  • A Rhizobium
  • B Beijerinckia
  • C Azotobacter
  • D None of these
Solution:
2399 Upvotes Verified Answer
The correct answer is: None of these
The nitrogen-fixing microbes could be free-living or symbiotic. Examples of free-living nitrogen-fixing aerobic microbes are Azotobacter and Beijerinckia while Rhodospirillum is anaerobic and free-living. In addition, a number of cyanobacteria such as Anabaena and Nostoc are also free-living nitrogen-fixers.

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