Spongesrespire through :-

Options

A. Gills
B. Lungs
C. Book-gills
D. General body surface

Answer

To answer the question "Sponges respire through:", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Sponges' Body Structure**:
- Sponges have a simple body structure that is porous. They are composed of a network of cells and have numerous small openings (pores) on their surface.

2. **Identifying Respiration Mechanism**:
- Sponges do not have specialized respiratory organs like gills or lungs. Instead, they rely on the movement of water through their bodies for respiration.

3. **Water Circulation**:
- Water enters the sponge through the pores and flows out through larger openings called oscula. This water flow is essential for both feeding and respiration.

4. **Diffusion Process**:
- Oxygen dissolved in the water diffuses across the cell membranes of the sponge cells, allowing for gas exchange. Similarly, carbon dioxide produced by the sponge cells diffuses out into the water.

5. **Evaluating the Options**:
- Given the options:
- A) Gills
- B) Lungs
- C) Book Gills
- D) General Body Surface
- Since sponges respire through the diffusion of gases across their body surface and do not possess specialized organs, the correct answer is **D) General Body Surface**.

### Final Answer:
Sponges respire through the **General Body Surface**.

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