The Question is from neet-botany , and it was created by the author K SURESH KUMAR

Question

Which of the given prokaryotes fixes nitrogen symbiotically as well as in free living state?

K SURESH KUMAR · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
	**Primary Concept**: Nitrogen Fixation by Prokaryotes
	**Related Topics**: Symbiotic Relationships, Free-living Nitrogen Fixers, Bacterial Diversity
	**Prerequisites**: Basic knowledge of prokaryotic organisms and nitrogen fixation process.
## SOLUTION PATHWAY
**Given Information**:
	The question asks for a prokaryote capable of both symbiotic and free-living nitrogen fixation.
**Method & Steps**:
	1. Recall the characteristics of each given prokaryote:
		Rhizobium: Known for symbiotic nitrogen fixation in plant roots.
		Thiobacillus: Primarily involved in sulfur oxidation, not nitrogen fixation.
		Anabaena: A cyanobacterium capable of both symbiotic (e.g., in association with Azolla) and free-living nitrogen fixation.
		Azotobacter: A free-living nitrogen fixer.
	2. Identify the prokaryote that meets both conditions: Anabaena.
	3. Select the correct answer based on the analysis.
## OPTION ANALYSIS
[A] :x: Rhizobium is primarily a symbiotic nitrogen fixer, not free-living.
[B] :x: Thiobacillus is involved in sulfur metabolism, not nitrogen fixation.
[C] ✓: Anabaena can fix nitrogen both symbiotically and in a free-living state.
[D] :x: Azotobacter is a free-living nitrogen fixer, not symbiotic.
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing different types of nitrogen fixers: Remember that some bacteria are specialized for symbiotic or free-living lifestyles, while others can do both.
		2. Misidentifying Anabaena: Anabaena is a cyanobacterium, which is a key difference from other bacteria mentioned.
	**Quick Tips**:
		1. Use a table to organize the nitrogen fixing capabilities of different prokaryotes.
		2. Remember the key examples of symbiotic and free-living nitrogen fixers.

K SURESH KUMAR · Answer

Rhizobium

K SURESH KUMAR · Answer

Thiobacillus

K SURESH KUMAR · Answer

The correct Option is "Anabaena"

K SURESH KUMAR · Answer

Azotobacter

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