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

Question

Which of the following is a free living aerobic non – photosynthetic nitrogen fixer?

D VINOD · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
	**Primary Concept**: Nitrogen Fixation
	**Related Topics**: Microbiology, Soil Science, Nutrient Cycles
	**Prerequisites**: Types of bacteria, Nitrogen cycle
## SOLUTION PATHWAY
**Given Information**:
	We need to identify a free-living, aerobic, non-photosynthetic nitrogen fixer.
**Method & Steps**:
	1. **Free-living**: The organism should be able to fix nitrogen independently, without a symbiotic relationship with plants.
	2. **Aerobic**: The organism requires oxygen for its metabolism.
	3. **Non-photosynthetic**: The organism does not perform photosynthesis.
	4. **Nitrogen fixer**: The organism can convert atmospheric nitrogen into ammonia.

Analyzing the options based on the above criteria:
## OPTION ANALYSIS
[A] :x: Rhizobium: Rhizobium is a symbiotic nitrogen fixer, forming root nodules in leguminous plants. It's not free-living.
[B] ✓: Azotobacter: Azotobacter is a free-living, aerobic, non-photosynthetic nitrogen-fixing bacteria found in soil.
[C] :x: Azo spirillum: Azo spirillum is a free-living, nitrogen-fixing bacteria, but it is a microaerophile, meaning it requires low oxygen levels. It's not a strict aerobe.
[D] :x: Nostoc: Nostoc is a photosynthetic cyanobacterium capable of nitrogen fixation. It's not non-photosynthetic.
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing symbiotic and free-living nitrogen fixers: Remember that free-living nitrogen fixers can fix nitrogen independently, while symbiotic nitrogen fixers require a host plant.
		2. Ignoring oxygen requirements:  Differentiate between aerobic, anaerobic, and microaerophilic organisms.
	**Quick Tips**:
		1. Azotobacter is a key example of a free-living aerobic nitrogen fixer.
		2. Remember the characteristics of each nitrogen-fixing bacteria mentioned.

D VINOD · Answer

Rhizobium

D VINOD · Answer

The correct Option is "Azotobacter"

D VINOD · Answer

Azo spirillum

D VINOD · Answer

Nostoc

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