Presence of comb plates is characteristic feature of

Options

A. Porifera
B. Cnidaria
C. Ctenophora
D. Platyhelminthes.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the phylum that is characterized by the presence of comb plates.

2. **Analyzing the Options**: The options provided are:
- A) Porifera
- B) Cnidaria
- C) Ctenophora
- D) Platyhelminthes

3. **Identifying Comb Plates**: Comb plates, also known as ciliated plates, are structures that consist of rows of cilia. They are primarily used for locomotion in certain organisms.

4. **Examining Each Option**:
- **Porifera**: This phylum includes sponges, which do not have comb plates. Therefore, this option is incorrect.
- **Cnidaria**: Members of this phylum, such as jellyfish and corals, have specialized cells called cnidocytes, but they do not possess comb plates. This option is also incorrect.
- **Ctenophora**: This phylum is known for its members having comb plates (ciliated plates) that assist in locomotion. This option is correct.
- **Platyhelminthes**: This phylum includes flatworms, which do not have comb plates. Thus, this option is incorrect.

5. **Conclusion**: Based on the analysis, the correct answer is C) Ctenophora, as it is the only phylum characterized by the presence of comb plates.

**Final Answer**: C) Ctenophora

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