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

Question

The mannitol is the stored food material of which group of algae?

NISHANTH · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Carbohydrate storage in algae
 **Related Topics**: Algal classification, Photosynthesis,  Algal cell structure
 **Prerequisites**: Basic knowledge of different algal groups and their characteristics.
## SOLUTION PATHWAY
**Given Information**:
  Mannitol is a type of carbohydrate.
  The question asks which algal group stores mannitol as a food reserve.
**Method & Steps**:
 1. Identify the algal groups.
  Reasoning: The options provided are Chlorophyta (green algae), Rhodophyta (red algae), Phaeophyta (brown algae), and Cyanobacteria (blue-green algae).
 2. Determine the stored food material for each group.
  Working:  Green algae (Chlorophyta) primarily store starch. Red algae (Rhodophyta) store floridean starch. Brown algae (Phaeophyta) store laminarin and mannitol. Cyanobacteria store cyanophycean starch.
  Key Point: Different algal groups have evolved distinct mechanisms for storing energy reserves, reflecting their evolutionary history and environmental adaptations.
 3. Identify the group storing mannitol.
  Result: Brown algae (Phaeophyta) store mannitol as their primary storage carbohydrate.
  Verification: This is a well-established fact in phycology (the study of algae).
 ## OPTION ANALYSIS
A :x: Chlorophyta store starch, not mannitol.
B :x: Rhodophyta store floridean starch, not mannitol.
C ✓: Phaeophyta (brown algae) store mannitol as a food reserve.
D :x: Cyanobacteria store cyanophycean starch, not mannitol.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the storage carbohydrates of different algal groups:  Remembering the specific storage carbohydrate for each group is crucial.
  2. Assuming all algae store the same type of carbohydrate: Algal groups have diverse storage mechanisms.
 **Quick Tips**:
  1. Create a table summarizing the storage carbohydrates of major algal groups for easy memorization.
  2. Associate the name 'mannitol' with 'mannitol' and 'brown algae' to aid recall.

NISHANTH · Answer

Chlorophyta

NISHANTH · Answer

Rhodophyta

NISHANTH · Answer

The correct Option is "Phaeophyta (Brown algae)"

NISHANTH · Answer

Cyanobacteria

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