The members of which phylum show radial symmetry ?

Options

A. Coelenterata
B. Ctenophora
C. Echinodermata
D. All of the above

Answer

**Step-by-Step Solution:**

1. **Understanding Radial Symmetry**:
- Radial symmetry refers to the arrangement of similar parts around a central axis. Organisms with radial symmetry can be divided into similar halves by multiple planes passing through the central axis.

2. **Identifying Phyla with Radial Symmetry**:
- We need to identify which phyla exhibit radial symmetry. The common phyla that are known for radial symmetry include:
- **Cnidaria**: This phylum includes organisms such as jellyfish, corals, and sea anemones, which exhibit radial symmetry.
- **Ctenophora**: Also known as comb jellies, members of this phylum also display radial symmetry.
- **Echinodermata**: This phylum includes starfish and sea urchins, which show radial symmetry, particularly in their adult forms.

3. **Evaluating the Options**:
- If the question provides options, we need to evaluate each one:
- **Cnidaria**: Yes, exhibits radial symmetry.
- **Ctenophora**: Yes, exhibits radial symmetry.
- **Echinodermata**: Yes, exhibits radial symmetry.
- If there is an option that states "All of the above", this would be the correct answer since all the mentioned phyla show radial symmetry.

4. **Conclusion**:
- Therefore, the members of the phyla Cnidaria, Ctenophora, and Echinodermata all show radial symmetry. If the question includes an option stating "All of the above", that would be the correct choice.

**Final Answer**: All of the above (Cnidaria, Ctenophora, Echinodermata) show radial symmetry.

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