Question:medium

Which of the following microorganisms can fix nitrogen symbiotically? 
• [(A).] Anabaena 
• [(B).] Azotobacter 
• [(C).] Frankia 
• [(D).] Ulothrix 
• [(E).] Bradyrhizobium 
Choose the correct answer from the options given below: 
 

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To easily classify nitrogen-fixers in exams:
- Symbiotic: Rhizobium, Bradyrhizobium, Frankia, Anabaena azollae.
- Free-living (Asymbiotic): Azotobacter (aerobic), Clostridium (anaerobic).
- Associative: Azospirillum.
Updated On: Jul 13, 2026
  • (A), (B) and (E) only.
  • (A), (C) and (E) only.
  • (A), (D) and (E) only.
  • (A), (C), (D) and (E) only.
Show Solution

The Correct Option is B

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