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

Question

Which phylum exhibits radial symmetry and tissue-level organization but lacks organ-level organization?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
	**Primary Concept**: Animal Kingdom Classification based on Symmetry and Organization
	**Related Topics**: Phylum Cnidaria, Phylum Porifera, Phylum Platyhelminthes, Phylum Echinodermata, Radial Symmetry, Bilateral Symmetry, Tissue-Level Organization, Organ-Level Organization
	**Prerequisites**: Basic understanding of animal kingdom characteristics and classification.
## SOLUTION PATHWAY
**Given Information**:
	We need to identify the phylum that has radial symmetry, tissue-level organization, but not organ-level organization.
**Method & Steps**:
	1. **Analyze each phylum based on the given criteria:**
		Reasoning: We'll examine the characteristics of each phylum to see which one fits the description.
	2. **Compare and eliminate options:**
		Working:  We'll compare the characteristics of each phylum with the given criteria and eliminate those that don't fit.
	3. **Identify the correct phylum:**
		Result: Cnidaria
		Verification: Cnidarians exhibit radial symmetry, have distinct tissues (e.g., epidermis, gastrodermis, nerve net), but lack complex organs formed from multiple tissue types.
## OPTION ANALYSIS
[A] ✓: Cnidaria: This phylum exhibits radial symmetry, has tissues like epidermis, gastrodermis, and a nerve net, but lacks organ-level organization. Examples include jellyfish, corals, and hydras.
[B] :x: Porifera: Sponges (Porifera) have a cellular level of organization and lack true tissues. They also exhibit an asymmetrical body plan, not radial symmetry.
[C] :x: Platyhelminthes: Flatworms (Platyhelminthes) exhibit bilateral symmetry and have organ-level organization. They have organs like a simple brain, eyespots, and a branched digestive system.
[D] :x: Echinodermata: Echinoderms (Echinodermata), like starfish and sea urchins, exhibit radial symmetry (penta-radial in adults) and have organ-level organization. They possess a water vascular system, tube feet, and a digestive system.
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing radial and bilateral symmetry: Remember that radial symmetry means the organism can be divided into equal halves along multiple planes passing through a central axis, while bilateral symmetry means only one plane can divide the organism into two mirrored halves.
		2. Misunderstanding tissue vs. organ-level organization: Tissues are groups of similar cells performing a specific function, while organs are composed of multiple tissues working together for a more complex function.
	**Quick Tips**:
		1. Visualize examples: Think of a jellyfish (Cnidaria) for radial symmetry and tissue-level organization. Think of a flatworm (Platyhelminthes) for bilateral symmetry and organ-level organization.
		2. Recall the defining features of each phylum:  Focus on symmetry and organizational levels to differentiate between the phyla.

Mr. NARESH KUMAR K · Answer

The correct Option is "Cnidaria"

Mr. NARESH KUMAR K · Answer

Porifera

Mr. NARESH KUMAR K · Answer

Platyhelminthes

Mr. NARESH KUMAR K · Answer

Echinodermata

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