Question

Which one is not a nitrogen fixing bacteria ?

• A. Azotobacter
• B. Azospirillum
• C. Frankia
• D. Clostridium

Answer 1

Answer:

C. Frankia

• The bacteria that is not a nitrogen-fixing bacteria is Clostridium. 

• While Azotobacter, Azospirillum, and Frankia are all known to be nitrogen-fixing bacteria, Clostridium is primarily associated with anaerobic fermentation and is not involved in nitrogen fixation. 

• Azotobacter and Azospirillum: These are free-living bacteria that can fix nitrogen in the soil. 

• Frankia: This bacterium is also a free-living nitrogen fixer, but it can form symbiotic relationships with certain plants. 

• Clostridium: This bacterium is primarily known for its role in causing various diseases, not nitrogen fixation.