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

Options

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

Answer

**Step-by-Step Solution:**

1. **Understanding Poriferans**: Poriferans, commonly known as sponges, are simple multicellular organisms that belong to the phylum Porifera. They have a unique body structure that includes a central cavity.

2. **Identifying the Spongocoel**: The spongocoel is the central cavity within a sponge. It plays a crucial role in the sponge's feeding and water circulation system.

3. **Water Flow in Sponges**: Water enters the spongocoel through small openings called ostia (singular: ostium). This water flow is essential for the sponge's feeding and respiration.

4. **Exiting Water**: After circulating through the spongocoel, the water exits through a larger opening known as the osculum (plural: oscula).

5. **Lining of the Spongocoel**: The spongocoel is lined with specialized cells that are crucial for the sponge's feeding mechanism. These cells are called choanocytes.

6. **Function of Choanocytes**: Choanocytes are flagellated cells that create a water current through the sponge. Their flagella beat to draw water into the spongocoel, allowing the sponge to filter out food particles from the water.

7. **Conclusion**: Therefore, the flagellated cells lining the spongocoel in poriferans are known as choanocytes.

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

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