Question:
Which of the following symbiotic microorganisms is nitrogen fixing?
Which of the following symbiotic microorganisms is nitrogen fixing?
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Rhizobium + Legumes = Classic Symbiotic Nitrogen Fixation.
Updated On: Apr 17, 2026
- Azotobacter
- Rhizobium
- Clostridium
- Cyanobacteria
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Concept
Nitrogen fixation is the conversion of atmospheric $N_2$ into usable forms by microbes.
Step 2: Meaning
"Symbiotic" refers to a relationship where two organisms live in close physical association.
Step 3: Analysis
Rhizobium is a bacterium that lives in a symbiotic relationship within the root nodules of leguminous plants, fixing nitrogen for the plant. Other listed microbes like Azotobacter are free-living.
Step 4: Conclusion
Rhizobium is the correct symbiotic nitrogen-fixing microorganism.
Final Answer:(B)
Nitrogen fixation is the conversion of atmospheric $N_2$ into usable forms by microbes.
Step 2: Meaning
"Symbiotic" refers to a relationship where two organisms live in close physical association.
Step 3: Analysis
Rhizobium is a bacterium that lives in a symbiotic relationship within the root nodules of leguminous plants, fixing nitrogen for the plant. Other listed microbes like Azotobacter are free-living.
Step 4: Conclusion
Rhizobium is the correct symbiotic nitrogen-fixing microorganism.
Final Answer:(B)
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