Annelida is characterised

Options

A. pseudocoelom
B. metamerism
C. non-muscular pharynx
D. renette gland

Answer

To solve the question regarding the characteristics of the phylum Annelida, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Phylum**: Annelida is a phylum that includes segmented worms such as earthworms and leeches.

2. **Understand the Options**: The question provides four options:
- A) Pseudoselum
- B) Metamerosome
- C) Non-muscular pharynx
- D) Rennet gland

3. **Analyze Each Option**:
- **Option A: Pseudoselum**: Annelids are coelomate animals, meaning they possess a true coelom (body cavity) and not a pseudocoelom. Therefore, this option is incorrect.
- **Option B: Metamerosome**: Annelids are characterized by their segmented bodies, which are referred to as metameres. This segmentation is a key characteristic of the phylum. Thus, this option is correct.
- **Option C: Non-muscular pharynx**: Annelids have a well-developed muscular pharynx, not a non-muscular one. Hence, this option is incorrect.
- **Option D: Rennet gland**: Rennet glands are associated with nematodes, not annelids. Annelids have excretory structures called nephridia. Therefore, this option is also incorrect.

4. **Conclusion**: Based on the analysis, the only correct characteristic of Annelida from the given options is **metamerosome** (Option B).

### Final Answer:
The phylum Annelida is characterized by **metamerosome**.

---