Question:
Which one of the following bacteria forms root nodules in Alnus?
Which one of the following bacteria forms root nodules in Alnus?
Show Hint
Alnus = Frankia (the non-legume association).
Updated On: Jun 6, 2026
- Rhodospirillum
- Frankia
- Nostoc
- Rhizobium
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Concept
Biological nitrogen fixation.
Step 2: Meaning
Symbiotic nitrogen-fixing associations between microbes and non-leguminous plants.
Step 3: Analysis
*Frankia* is a filamentous bacterium that forms symbiotic nitrogen-fixing root nodules in non-leguminous plants like *Alnus*. Rhizobium is primarily associated with legumes.
Step 4: Conclusion
Frankia is the specific microbe associated with *Alnus*.
Final Answer: (B)
Biological nitrogen fixation.
Step 2: Meaning
Symbiotic nitrogen-fixing associations between microbes and non-leguminous plants.
Step 3: Analysis
*Frankia* is a filamentous bacterium that forms symbiotic nitrogen-fixing root nodules in non-leguminous plants like *Alnus*. Rhizobium is primarily associated with legumes.
Step 4: Conclusion
Frankia is the specific microbe associated with *Alnus*.
Final Answer: (B)
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