Which cells are found only in sponges ?

Options

A. Amoeboid cells
B. Choanocytes
C. Germ cells
D. Nephrocytes

Answer

To answer the question "Which cells are found only in sponges?" we will analyze the options provided and understand the unique characteristics of sponge cells.

**Step 1: Understand the options provided.**
The options given are:
A. Amoeboid cells
B. Quinocytes
C. Germ cells
D. Nephrocytes

**Step 2: Identify the characteristics of sponges.**
Sponges belong to the phylum Porifera. They are simple, multicellular organisms that have a unique cellular structure and a water transport system.

**Step 3: Analyze each option in relation to sponges.**
- **Amoeboid cells:** These are found in various organisms, including sponges, but are not exclusive to them.
- **Quinocytes:** These are specialized cells found only in sponges. They are ciliated cells that line the canals and help in water circulation, food gathering, and waste removal.
- **Germ cells:** These are reproductive cells found in many organisms, not just sponges.
- **Nephrocytes:** These are excretory cells found in some invertebrates and are not specific to sponges.

**Step 4: Conclusion.**
Based on the analysis, the only cells that are found exclusively in sponges are Quinocytes.

**Final Answer:** B. Quinocytes

---