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

Question

Which of the following is a nitrogen fixing organism?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
	**Primary Concept**: Nitrogen fixation and nitrogen-fixing organisms.
	**Related Topics**:  Microbiology, Plant biology, Symbiotic relationships.
	**Prerequisites**: Basic knowledge of nitrogen cycle and different types of microorganisms.
## SOLUTION PATHWAY
**Given Information**:
	Question asks to identify nitrogen-fixing organisms.
	Options are BGA (Blue-Green Algae), Rhizobium, Both (1) and (2), and Agaricus.
**Method & Steps**:
	1. Recall the definition of nitrogen fixation.
		Reasoning: Nitrogen fixation is the process by which atmospheric nitrogen is converted into ammonia, a form usable by plants.
	2. Identify known nitrogen-fixing organisms.
		Working: BGA (also known as cyanobacteria) and Rhizobium are well-known nitrogen-fixing organisms.
	3. Eliminate incorrect options.
		Result: Agaricus is a fungus and not a nitrogen-fixing organism.
## OPTION ANALYSIS
[A] :x: BGA is a nitrogen fixer but not the only one listed.
[B] :x: Rhizobium is a nitrogen fixer but not the only one listed.
[C] ✓: Both BGA and Rhizobium are nitrogen fixers.
[D] :x: Agaricus is a fungus and is not involved in nitrogen fixation.
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing different types of microorganisms:  Remember that fungi (like Agaricus) are not nitrogen fixers, whereas certain bacteria (like Rhizobium) and cyanobacteria (like BGA) are.
	**Quick Tips**:
		1. Memorize key nitrogen-fixing organisms: BGA (cyanobacteria) and Rhizobium are common examples used in introductory biology.

Mr. NARESH KUMAR K · Answer

BGA

Mr. NARESH KUMAR K · Answer

Rhizobium

Mr. NARESH KUMAR K · Answer

The correct Option is "Both (1)and (2)"

Mr. NARESH KUMAR K · Answer

Agaricus

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