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

Question

The pink color inside a root nodule is due to the presence of:

NISHANTH · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Plant Physiology, specifically Nitrogen Fixation
 **Related Topics**: Legumes, Symbiotic Relationships, Root Nodules, Hemoglobin
 **Prerequisites**: Basic understanding of plant structures and functions, nitrogen cycle.
## SOLUTION PATHWAY
**Given Information**:
  The question asks about the pigment responsible for the pink color inside a root nodule.
  Root nodules are structures formed on the roots of leguminous plants as a result of a symbiotic relationship with nitrogen-fixing bacteria (Rhizobia).
**Method & Steps**:
 1. Identify the function of root nodules.
  Reasoning: Root nodules are sites of nitrogen fixation, a process crucial for converting atmospheric nitrogen into a usable form for plants.
  Formula/Rule: None directly applicable; this is a factual question.
 2. Consider the role of leghaemoglobin.
  Working: Leghaemoglobin is an oxygen-binding protein found within root nodules. It regulates the oxygen concentration within the nodule, maintaining a level suitable for nitrogenase, the enzyme responsible for nitrogen fixation.  Nitrogenase is sensitive to high oxygen levels and is inactivated in its presence.
  Key Point: The pink color is a direct consequence of the presence of leghaemoglobin.
 3. Eliminate other options.
  Result: Leghaemoglobin is the correct answer.
  Verification: Chlorophyll is the green pigment in plants, anthocyanin is responsible for red and purple colors in some plants, and carotenoids produce yellow and orange colors. None are directly associated with the pink color in root nodules.
 ## OPTION ANALYSIS
A :x: Chlorophyll is the green pigment in plants and is not involved in the pink color of root nodules.
B :x: Anthocyanins produce red and purple pigments; while some root nodules might exhibit reddish hues, the characteristic pink is due to leghaemoglobin.
C ✓: Leghaemoglobin is an oxygen-carrying protein found in root nodules, and its pink color is responsible for the pink hue observed.
D :x: Carotenoids are pigments responsible for yellow and orange colors in plants and are not relevant to the pink color of root nodules.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing leghaemoglobin with other plant pigments: Understanding the specific role of leghaemoglobin in nitrogen fixation is crucial.
  2.Failing to recognize the symbiotic relationship between legumes and nitrogen-fixing bacteria: This context is essential for understanding the presence and function of root nodules.
 **Quick Tips**:
  1.Remember the function of leghaemoglobin: oxygen regulation for nitrogenase.
  2.Associate the pink color directly with the presence of leghaemoglobin in root nodules.

NISHANTH · Answer

Chlorophyll

NISHANTH · Answer

Anthocyanin

NISHANTH · Answer

The correct Option is "Leghaemoglobin"

NISHANTH · Answer

Carotenoids

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