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

Question

Which specific phycocolloid found in Rhodophyceae contributes significantly to its characteristic red color and exhibits fluorescence?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
 **Primary Concept**: Phycobilins and their role in algal pigmentation
 **Related Topics**: Rhodophyceae (red algae) classification, phycocolloids, fluorescence
 **Prerequisites**: Basic understanding of algal pigments and their functions.
## SOLUTION PATHWAY
**Given Information**:
  The question asks about a phycocolloid in Rhodophyceae (red algae) that contributes to its red color and exhibits fluorescence.
  Rhodophyceae are known for their red color.
**Method & Steps**:
 1. Identify the pigments responsible for the red color in Rhodophyceae.
  Reasoning: Red algae derive their color from phycobilins, a group of accessory pigments.
  Formula/Rule: N/A
 2. Determine which phycobilin exhibits fluorescence.
  Working:  Phycoerythrin is the main phycobilin responsible for the red color in Rhodophyceae and is known to exhibit fluorescence.
  Key Point: Phycocyanin is a phycobilin found in cyanobacteria and some algae, but it's blue-green, not red.
 3. Identify the correct option.
  Result: Phycoerythrin (option B) is the correct answer.
  Verification:  The characteristic red color and fluorescence of Rhodophyceae are indeed due to phycoerythrin.
 ## OPTION ANALYSIS
A :x: Phycocyanin is a blue-green pigment, not responsible for the red color of Rhodophyceae.
B ✓: Phycoerythrin is the major pigment responsible for the red color in Rhodophyceae and exhibits fluorescence.
C :x: Carrageenan is a phycocolloid (a polysaccharide) extracted from red algae, but it doesn't contribute to the red color or fluorescence. It's a structural component.
D :x: Fucoxanthin is a carotenoid found in brown algae (Phaeophyceae), not red algae.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing phycocyanin with phycoerythrin: Remember that phycocyanin is blue-green, while phycoerythrin is red.
  2.Focusing only on carrageenan: Carrageenan is an important product from red algae, but it's not the pigment responsible for the color.
 **Quick Tips**:
  1.Remember the color association: Phycoerythrin (red), Phycocyanin (blue-green).
  2.Red algae = Phycoerythrin

Mr. NARESH KUMAR K · Answer

Phycocyanin

Mr. NARESH KUMAR K · Answer

The correct Option is "Phycoerythrin"

Mr. NARESH KUMAR K · Answer

Carrageenan

Mr. NARESH KUMAR K · Answer

Fucoxanthin

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