A central cavity common in all types of canal systems of sponges is called

Options

A. Incurrent canal
B. radial canal
C. excurrent canal
D. paragastric cavity

Answer

To answer the question regarding the central cavity common in all types of canal systems of sponges, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Sponges**:
- Sponges are simple aquatic animals that belong to the phylum Porifera. They have a unique body structure that includes a system of canals.

2. **Identifying Canal Systems**:
- Sponges have different types of canal systems based on their complexity: Asconoid, Syconoid, and Leuconoid. Each of these systems has a specific arrangement of canals.

3. **Central Cavity in Sponges**:
- Within these canal systems, there is a central cavity that plays a crucial role in the sponge's physiology. This cavity is involved in the flow of water through the sponge.

4. **Types of Cavities**:
- The terms associated with sponge cavities include Incurrent Canals, Radial Canals, Excurrent Canals, and Paragastric Cavity.
- Incurrent canals are present in Syconoid and Leuconoid sponges, while Radial and Excurrent canals are also found in these systems.

5. **Finding the Common Cavity**:
- The Paragastric cavity is a specific cavity that is found in all three types of canal systems (Asconoid, Syconoid, and Leuconoid). It serves as a central cavity where the radial canals open.

6. **Conclusion**:
- Therefore, the central cavity common in all types of canal systems of sponges is called the **Paragastric cavity**.

### Final Answer:
The central cavity common in all types of canal systems of sponges is called the **Paragastric cavity**.

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