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Question

Slime moulds in the division-Myxomycota (true slime moulds) have

D VINOD · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
	**Primary Concept**: Characteristics of Myxomycota (True Slime Moulds)
	**Related Topics**:  Fungi-like protists, Life cycles, Plasmodium, Cellular structure
	**Prerequisites**: Basic understanding of Protista and their classification.
## SOLUTION PATHWAY
**Given Information**:
	We are looking for a defining characteristic of Myxomycota.
**Method & Steps**:
	1. **Recall the life cycle of Myxomycota:** True slime moulds have a unique life cycle that includes a distinctive multinucleate plasmodial stage.
		Reasoning: This plasmodium is a large, amoeboid mass with multiple nuclei but without cell walls, allowing it to move and engulf food particles.
	2. **Consider other options:**  Chitinous cell walls are characteristic of fungi, not Myxomycota. Chlorophyll indicates photosynthetic capability, which slime moulds lack. While they have a complex life cycle, multicellularity is not present in all stages; the plasmodial stage is syncytial (multinucleate).
		Key Point: The plasmodial stage is a key diagnostic feature of Myxomycota.
	3. **Identify the correct option:** The presence of a multinucleate plasmodial stage accurately describes Myxomycota.
		Result: Option A
		Verification: This aligns with the defining characteristics of true slime moulds.
## OPTION ANALYSIS
[A] ✓: **a multinucleate plasmodial stage**: This is the defining characteristic of Myxomycota. The plasmodium is a mobile, multinucleate mass that engulfs food by phagocytosis.
[B] :x: **chitinous cell walls**: Chitin is a component of fungal cell walls, not slime mould cell walls. Slime moulds lack cell walls in their plasmodial stage.
[C] :x: **chlorophyll**: Slime moulds are heterotrophic, meaning they obtain nutrients by consuming other organisms. They do not contain chlorophyll and are not photosynthetic.
[D] :x: **multicellularity in all stages of their life cycle**: While slime moulds have a complex life cycle, they are not multicellular in all stages.  The prominent plasmodial stage is a multinucleate, single-celled structure, not a multicellular structure.
## LEARNING AIDS
	**Common Mistakes**:
		1. **Confusing slime moulds with fungi**: Remember that slime moulds are protists, not fungi.  Fungi have chitinous cell walls, while slime moulds do not.
		2. **Misinterpreting 'multicellular'**: The plasmodial stage is multinucleate but not multicellular. It is a single mass of cytoplasm with many nuclei.
	**Quick Tips**:
		1. **Key Feature**: Associate 'plasmodium' with Myxomycota.
		2. **Visual Aid**:  Imagine a large, creeping mass of cytoplasm – that's the plasmodium.

D VINOD · Answer

The correct Option is "a multinucleate plasmodial stage"

D VINOD · Answer

chitinous cell walls

D VINOD · Answer

chlorophyll

D VINOD · Answer

multicellularity in all stages of their life cycle

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