In sponges, the water entres the body through minute pores known as

Options

A. Osculum
B. Ostia
C. Spongocoel
D. Spicules

Answer

### Step-by-Step Solution

1. **Understanding Sponges**: Sponges are simple aquatic animals that belong to the phylum Porifera. They have a porous body structure that allows water to flow through them.

2. **Identifying the Structure**: In the sponge's anatomy, there are various structures that facilitate the movement of water. The main body of the sponge is called the "spongocoel," which is a large central cavity.

3. **Recognizing the Pores**: Water enters the sponge through small openings on its surface. These small pores are crucial for the sponge's feeding and respiration processes.

4. **Naming the Pores**: The specific term used to describe these minute pores through which water enters the sponge is "ostria" (also spelled "ostia").

5. **Distinguishing Other Structures**: It’s important to note that while "osculum" is a large opening through which water exits the sponge, the "ostria" are the smaller pores that allow water to enter.

6. **Conclusion**: Therefore, the correct answer to the question is that in sponges, the water enters the body through minute pores known as "ostria."