Spongocoel opens out through

Options

A. ostia
B. osculum
C. madreporite
D. cloaca

Answer

To answer the question "Spongocoel opens out through," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Spongocoel**:
- The spongocoel is the central cavity found in sponges (phylum Porifera). It is where water is collected after it has passed through the sponge's body.

2. **Identifying the Openings**:
- In sponges, there are specific openings that facilitate the flow of water. The two main types of openings are:
- **Ostia**: These are small pores through which water enters the sponge.
- **Osculum**: This is a larger opening through which water exits the spongocoel.

3. **Water Flow in Sponges**:
- Water enters the sponge through the ostia, flows through the canals and the spongocoel, and then exits through the osculum.

4. **Conclusion**:
- Since the question asks where the spongocoel opens out, the correct answer is the osculum, as it is the exit point for water from the spongocoel.

### Final Answer:
The spongocoel opens out through the **Osculum**.

---