The Question is from neet-botany biological-classification , and it was created by the author NISHANTH

Question

Which of the following is a free living nitrogen fixing bacterium present in the soil?

NISHANTH · Accepted Answer

## CORE INFORMATION
✓ **Answer**: [C]
## CONCEPT FRAMEWORK
	**Primary Concept**: Nitrogen fixation and soil microbiology
	**Related Topics**: Free-living bacteria, Nitrogen cycle, Soil ecology
	**Prerequisites**: Understanding of nitrogen fixation, different types of bacteria
## SOLUTION PATHWAY
**Given Information**:
		1. Options include: Nitrosomonas, Rhizobium, Azotobacter, Pseudomonas.
		2. Focus on free-living nitrogen-fixing bacteria.
**Method & Steps**:
	1. Identify the characteristics of each bacterium.
		Reasoning: Only certain bacteria can fix nitrogen independently in the soil.
		Formula/Rule: Free-living vs. symbiotic nitrogen fixation.
	2. Analyze each option:
		- **Nitrosomonas**: Converts ammonia to nitrite but does not fix nitrogen.
		- **Rhizobium**: Forms symbiotic relationships with legumes for nitrogen fixation.
		- **Azotobacter**: Known for its ability to fix atmospheric nitrogen freely in the soil.
		- **Pseudomonas**: Primarily known for its role in biodegradation, not nitrogen fixation.
	3. Conclusion:
		Result: Azotobacter is the free-living nitrogen-fixing bacterium.
		Verification: It is well-documented in microbiological studies.
## OPTION ANALYSIS
[A] :x: Nitrosomonas does not fix nitrogen; it oxidizes ammonia.
[B] :x: Rhizobium is symbiotic with plants, not free-living.
[C] ✓: Azotobacter is a well-known free-living nitrogen fixer in the soil.
[D] :x: Pseudomonas is not primarily known for nitrogen fixation.
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing symbiotic relationships with free-living organisms: Always clarify whether the organism is independent.
		2. Overlooking the specific function of bacteria: Understand the roles of different bacteria in the nitrogen cycle.
	**Quick Tips**:
		1. Remember that 'Azotobacter' is associated with free-living nitrogen fixation.
		2. Associate 'Rhizobium' with legumes to remember its symbiotic nature.

NISHANTH · Answer

Nitrosomonas

NISHANTH · Answer

Rhizobium

NISHANTH · Answer

The correct Option is "Azotobacter"

NISHANTH · Answer

Pseudomonas

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