Which one of the sponges corresponds to the mouth of other animals ?

Options

A. Osculum
B. Incurrent canal
C. Ostia
D. Excurrent canal

Answer

To solve the question "Which one of the sponges corresponds to the mouth of other animals?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Sponges**: Sponges belong to the phylum Porifera and are known for their unique body structure that includes various openings and canals.

2. **Identify the Key Terms**: The options provided are:
- A) Osculum
- B) Incurrent Canal
- C) Osteia
- D) Excurrent Canal

3. **Define Each Term**:
- **Osculum**: This is the large opening at the top of the sponge through which water exits after passing through the sponge's body.
- **Incurrent Canal**: These are channels through which water enters the sponge.
- **Osteia**: These are small pores on the sponge's surface that allow water to enter.
- **Excurrent Canal**: These are channels that lead water out of the sponge after it has been filtered.

4. **Determine the Function of Each Structure**:
- The **Osteia** are responsible for the intake of water, which is similar to how the mouth functions in other animals by allowing food and water to enter.
- The **Osculum** is the exit point for water and waste, not analogous to a mouth.

5. **Conclusion**: Since the Osteia are the openings through which water enters the sponge, they correspond to the mouth of other animals, as they allow the intake of nutrients.

6. **Final Answer**: Therefore, the correct answer is **C) Osteia**.