The Question is from neet-botany , and it was created by the author D VINOD

Question

Which of the following symbiotic nitrogen-fixing organisms is associated with non-leguminous plants like *Alnus*?

D VINOD · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C. Frankia
## CONCEPT FRAMEWORK
 **Primary Concept**: Symbiotic nitrogen fixation in non-legumes
 **Related Topics**:  Plant-microbe interactions, actinobacteria
 **Prerequisites**: Knowledge of different nitrogen-fixing organisms and their hosts.
## SOLUTION PATHWAY
**Given Information**:
  The question focuses on a symbiotic nitrogen-fixing organism in non-leguminous plants, specifically mentioning *Alnus*.
**Method & Steps**:
 1. Identify the type of plant: Non-leguminous.
  Reasoning: This excludes *Rhizobium*, which is specific to legumes.
 2. Recall the nitrogen-fixing organism associated with non-leguminous plants like *Alnus*:
  Working: *Frankia* is the known symbiotic nitrogen-fixing organism for many non-leguminous plants, including *Alnus*.
  Key Point: *Frankia* forms nitrogen-fixing nodules on the roots of its host plants.
 3. Select the correct answer:
  Result: *Frankia*
  Verification: This aligns with the established knowledge of plant-microbe interactions.
 ## OPTION ANALYSIS
[A] :x: Rhizobium: Specific to legumes.
[B] :x: Azotobacter: Free-living nitrogen fixer, not symbiotic nodule former.
[C] ✓: Frankia: Forms symbiotic relationships with non-leguminous plants like *Alnus*.
[D] :x: Mycorrhiza:  A symbiotic relationship between plant roots and fungi, beneficial for nutrient uptake but not nitrogen fixation.
 ## LEARNING AIDS
 **Common Mistakes**:  Confusing *Frankia* with other nitrogen-fixing organisms.
  How to avoid:  Learn the specific host-microbe associations for major nitrogen-fixing organisms.
 **Quick Tips**:  *Frankia* is key for nitrogen fixation in many actinorhizal plants (non-legumes).

D VINOD · Answer

Rhizobium

D VINOD · Answer

Azotobacter

D VINOD · Answer

The correct Option is "Frankia"

D VINOD · Answer

Mycorrhiza

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