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

Question

The common nitrogen-fixer in paddy fields is

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
	**Primary Concept**: Nitrogen fixation in paddy fields
	**Related Topics**: Nitrogen cycle, Symbiotic relationships, Free-living nitrogen fixers
	**Prerequisites**: Basic knowledge of nitrogen fixation and common nitrogen-fixing bacteria
## SOLUTION PATHWAY
**Given Information**:
	The question asks for the common nitrogen-fixer in paddy fields.
**Method & Steps**:
	1. Recall common nitrogen-fixing bacteria.
		Reasoning: Nitrogen fixation is crucial for plant growth, and certain bacteria play a significant role in this process.
	2. Identify which of the given options is commonly found in paddy fields.
		Reasoning: Azospirillum is known to be a free-living nitrogen-fixing bacteria commonly found in association with the roots of rice plants in paddy fields.
	3. Select the correct answer.
		Result: Azospirillum is the correct answer.
## OPTION ANALYSIS
[A] :x: Rhizobium is primarily associated with legumes and not as common in paddy fields.
[B] ✓: Azospirillum is a free-living nitrogen-fixing bacteria commonly found in paddy fields.
[C] :x: Oscillatoria is a cyanobacterium involved in nitrogen fixation in aquatic environments, but not primarily in paddy fields.
[D] :x: Frankia is an actinomycete that forms symbiotic relationships with certain trees and shrubs, not typically found in paddy fields.
## LEARNING AIDS
	**Common Mistakes**:
		1.[Error 1]: Confusing Rhizobium with Azospirillum. [How to avoid]: Remember Rhizobium is primarily associated with legumes while Azospirillum is found in paddy fields.
		2.[Error 2]: Assuming all nitrogen-fixing organisms are common in paddy fields. [How to avoid]: Focus on specific organisms and their habitats.
	**Quick Tips**:
		1.[Helpful shortcut]: Recall that 'Azos' often refers to nitrogen and 'spirillum' to a spiral bacteria.
		2.[Memory aid]: Think of 'Azospirillum' with 'rice' in paddy fields to help remember its habitat.

Mr. NARESH KUMAR K · Answer

Rhizobium

Mr. NARESH KUMAR K · Answer

The correct Option is "Azospirillum"

Mr. NARESH KUMAR K · Answer

Oscillatoria

Mr. NARESH KUMAR K · Answer

Frankia

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