Metamerism is characteristic of phylum

Options

A. Porifers
B. Platyhelminthes
C. Annelida
D. Mollusca

Answer

**Step-by-Step Solution:**

1. **Understand the Term "Metamerism":**
- Metamerism refers to the segmentation of the body into repeated units or segments. Each segment may contain similar organs and structures.

2. **Identify the Options Given:**
- The options provided are:
- A) Porifera
- B) Bee (Insecta)
- C) Platyhelminthes
- D) Annelida
- E) Mollusca

3. **Analyze Each Option:**
- **A) Porifera:** These are sponges and do not exhibit metamerism; they have a simple body structure without segmentation.
- **B) Bee (Insecta):** While insects have body segments, they are not considered metameric in the same way as annelids. They have a different body plan.
- **C) Platyhelminthes:** These are flatworms, which also do not show true metamerism; they have a flattened body but lack segmentation.
- **D) Annelida:** This phylum includes earthworms, leeches, and polychaetes, which are characterized by their segmented bodies. Each segment contains similar organs, making this the correct choice.
- **E) Mollusca:** Mollusks do not exhibit metamerism; they have a soft body that is not segmented in the same way as annelids.

4. **Conclude the Correct Answer:**
- Based on the analysis, the phylum that exhibits metamerism is **Annelida**. Therefore, the correct answer is option **D) Annelida**.

**Final Answer:**
Metamerism is characteristic of phylum **Annelida**.

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