The central cavity of sponges, the paragastric cavity, is made of ____ cells.

• A. Choanocyte
• B. Chromocyte
• C. Amoebocyte
• D. Pinacocyte

The central cavity of sponges, known as the paragastric cavity, is primarily lined with choanocyte cells. These specialized cells play a crucial role in the sponge's feeding process by creating water currents and trapping food particles.

Cell Types in Sponges

To better understand the different types of cells in sponges, here’s a brief overview:

• Choanocytes: These are the flagellated cells that line the inner cavity and help in feeding.
• Amoebocytes: These cells are involved in digestion and distribution of nutrients.
• Pinacocytes: These form the outer layer of the sponge and provide protection.
• Chromocytes: These are not typically found in sponges and are more associated with other organisms.

In summary, the correct answer is A. Choanocyte, as these cells are essential for the sponge's feeding mechanism and overall function.