Which of the following have minute pores (ostia) in the body wall ?

Options

A. Aurelia and Obelia
B. Adamsia and Euplectella
C. Leucosolenia and Spongilla
D. Sycon and Hydra

Answer

To solve the question regarding which organisms have minute pores (ostia) in their body wall, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the term "ostia":**
- Ostia are small pores found in the body wall of certain organisms. They play a crucial role in processes such as feeding, respiration, and excretion.

2. **Identify the phylum associated with ostia:**
- The presence of ostia is characteristic of organisms belonging to the phylum **Porifera** (sponges). These pores facilitate the movement of water through the sponge's body, allowing for vital functions.

3. **Examine the options provided:**
- **Aurelia and Ovelia:** Both belong to the phylum **Cnidaria**, which does not have ostia. Therefore, this option is incorrect.
- **Adamsia and Uplectella:** Adamsia belongs to Cnidaria, while Uplectella is a type of sponge (Porifera). Since Adamsia does not have ostia, this option is also incorrect.
- **Saikon and Hydra:** Saikon is a sponge (Porifera) and has ostia, but Hydra belongs to Cnidaria and does not have ostia. Thus, this option is incorrect.
- **Leucosolenia and Spongilla:** Both of these organisms belong to the phylum **Porifera** and are known to have ostia. Therefore, this option is correct.

4. **Conclude the answer:**
- The correct answer is **Leucosolenia and Spongilla**, as both possess minute pores (ostia) in their body wall.

### Final Answer:
**Leucosolenia and Spongilla have minute pores (ostia) in their body wall.**

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