In case of poriferans ,the spongocoel is lined with flagellated cells called ?

Options

A. ostia
B. oscula
C. choanocytes
D. mesenchymal cells

Answer

To answer the question, "In case of poriferans, the spongocoel is lined with flagellated cells called?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Poriferans**: Poriferans, commonly known as sponges, are simple multicellular organisms that belong to the phylum Porifera. They are characterized by their porous bodies and a central cavity.

2. **Identifying the Spongocoel**: The spongocoel is the large central cavity found within sponges. It plays a crucial role in the water circulation system of these organisms.

3. **Water Flow in Sponges**: Water enters the spongocoel through numerous small openings called ostia (singular: ostium). After circulating through the spongocoel, the water exits through a larger opening known as the osculum.

4. **Role of Flagellated Cells**: The spongocoel is lined with specialized cells that have flagella. These cells are responsible for creating water currents that facilitate the movement of water through the sponge, aiding in feeding and respiration.

5. **Identifying the Flagellated Cells**: The flagellated cells that line the spongocoel are known as choanocytes. These cells have a collar-like structure surrounding the flagellum, which helps trap food particles from the water.

6. **Conclusion**: Based on the above information, the flagellated cells lining the spongocoel in poriferans are called choanocytes.

### Final Answer:
The spongocoel in poriferans is lined with flagellated cells called **choanocytes**.

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