Middle layer of body wal in sponges is called

Options

A. Mesoderm
B. Mesogloea
C. Mesenchyme
D. Mesentery

Answer

To answer the question about the middle layer of the body wall in sponges, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Sponges**: Begin by recognizing that sponges are simple aquatic animals that belong to the phylum Porifera. They have a unique body structure that is different from more complex organisms.

2. **Body Layers in Sponges**: Sponges are classified as diploblastic organisms. This means they have two primary layers: the outer layer (ectoderm) and the inner layer (endoderm).

3. **Identifying the Middle Layer**: In sponges, the middle layer is not a true tissue layer like in triploblastic organisms. Instead, it consists of a gelatinous substance that contains various cells.

4. **Terminology**: The correct term for the middle layer in sponges is "mesenchyme." This layer is made up of loosely packed cells and is crucial for the sponge's structure and function.

5. **Eliminating Other Options**:
- **Mesoderm**: This is found in triploblastic animals and is not applicable to sponges.
- **Mesoglea**: This is a jelly-like substance found in jellyfish, not in sponges.
- **Mesentery**: This is a structure found in more complex animals, associated with the intestines.

6. **Conclusion**: Therefore, the middle layer of the body wall in sponges is called "mesenchyme."

### Final Answer:
The middle layer of the body wall in sponges is called **mesenchyme**.

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