Collar cells form the lining of spongocoel in

Options

A. Jelly fish
B. Sycon
C. Taenia
D. Pila

Answer

To solve the question "Collar cells form the lining of spongocoel in", we can follow these steps:

### Step 1: Understand Collar Cells
- Collar cells, also known as choanocytes, are specialized cells found in sponges. They have a unique structure that includes a flagellum surrounded by a collar of microvilli.

**Hint:** Remember that collar cells are also called choanocytes and are crucial for the sponge's feeding mechanism.

### Step 2: Identify the Function of Collar Cells
- The primary function of collar cells is to create water currents through the sponge by beating their flagella. This movement helps in bringing water, nutrients, and oxygen into the sponge while also aiding in the removal of waste products.

**Hint:** Focus on how collar cells contribute to the sponge's feeding and waste removal processes.

### Step 3: Locate Collar Cells in Sponges
- Collar cells line the spongocoel, which is the central cavity of the sponge. They are found in various body types of sponges, including asconoid, syconoid, and leuconoid.

**Hint:** Recall that collar cells are specifically associated with the internal structure of sponges.

### Step 4: Analyze the Options
- The question provides multiple options. We need to determine which of these options is a type of sponge where collar cells line the spongocoel.
- The correct answer is "syconoid," as collar cells are indeed found lining the spongocoel in syconoid sponges.

**Hint:** Compare the options given and remember that only sponges contain collar cells.

### Step 5: Conclusion
- Based on the analysis, the correct answer to the question is that collar cells form the lining of the spongocoel in "syconoid" sponges.

**Final Answer:** Collar cells form the lining of spongocoel in **syconoid** sponges.