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

Question

Which specific characteristic of *Chlamydomonas* distinguishes its flagellar structure from other Chlorophyceae members?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
	**Primary Concept**: Flagellar structure in green algae (Chlorophyceae)
	**Related Topics**: Algal taxonomy, Cell biology, Microscopy
	**Prerequisites**: Basic understanding of algal diversity and cellular structures.
## SOLUTION PATHWAY
**Given Information**:
	We need to identify a unique feature of *Chlamydomonas* flagella compared to other members of Chlorophyceae.
**Method & Steps**:
	1. Recall the general flagellar structure in Chlorophyceae.
		Reasoning: Most Chlorophyceae have smooth flagella.
	2. Identify the distinguishing feature of *Chlamydomonas* flagella.
		Working: *Chlamydomonas* possesses flagellar hairs, also known as mastigonemes, which are hair-like projections extending from the flagellar surface.
		Key Point:  These mastigonemes are crucial for the swimming motion of *Chlamydomonas*.
	3. Relate this feature to the given options.
		Result: Option A correctly identifies the presence of flagellar hairs or mastigonemes as the distinguishing characteristic.
		Verification: This is a well-established fact in algal biology.
## OPTION ANALYSIS
[A] ✓: *Chlamydomonas* has flagellar hairs (mastigonemes), a distinct feature not commonly found in other Chlorophyceae.
[B] :x: *Chlamydomonas*, like most motile algae, has basal bodies anchoring the flagella.
[C] :x:  The '9+2' microtubule arrangement is typical for eukaryotic flagella, including those of *Chlamydomonas* and other Chlorophyceae.
[D] :x: While some green algae have scales on their flagella, it's not a universal characteristic of Chlorophyceae, nor is it the primary distinguishing feature of *Chlamydomonas* flagella.
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing the '9+2' arrangement with other microtubule structures: Remember '9+2' is the standard eukaryotic flagellar structure.
		2. Overgeneralizing flagellar characteristics across all algae: Appreciate the diversity within algal groups.
	**Quick Tips**:
		1. Visualize *Chlamydomonas* under a microscope to remember the hairy flagella.
		2. Associate 'mastigonemes' with *Chlamydomonas* for easier recall.

Mr. NARESH KUMAR K · Answer

The correct Option is "Presence of flagellar hairs or mastigonemes"

Mr. NARESH KUMAR K · Answer

Absence of a basal body

Mr. NARESH KUMAR K · Answer

9+0 microtubule arrangement in the axoneme

Mr. NARESH KUMAR K · Answer

Flagella covered by a sheath of scales

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