Which of the following cells of Porifera act as totipotent cells and responsible for high power of regeneration?

Options

A. Pinacocytes
B. Choanocytes
C. Collenocytes
D. Archeocytes

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which cells in Porifera (sponges) are totipotent and responsible for regeneration. Totipotent cells are those that can differentiate into any type of cell.

2. **Identifying the Cell Types**: The four types of cells mentioned in the question are:
- Pinacocytes
- Choanocytes
- Collencytes
- Archaeocytes

3. **Analyzing Each Cell Type**:
- **Pinacocytes**: These are flat cells that form the outer layer of the sponge. They do not have regenerative capabilities and are not totipotent.
- **Choanocytes**: These are flagellated cells with a collar of protoplasm. Their primary function is to create water flow through the sponge, not regeneration.
- **Collencytes**: These cells are found in the mesohyl and are involved in secreting fibers. They do not exhibit totipotency or significant regenerative abilities.
- **Archaeocytes**: These are the totipotent cells in sponges. They can transform into various cell types and play a crucial role in regeneration.

4. **Conclusion**: Based on the analysis, the correct answer is **Archaeocytes**, as they are the totipotent cells responsible for the high power of regeneration in Porifera.

**Final Answer**: Archaeocytes

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