Question

Spongocoel in general, is lined by

• A. Double layer of pinacocytes
• B. Single layer of pinacocytes
• C. Single layer of choanocytes
• D. Double layer of choanocytes

Answer 1

Answer: (C)

Single layer of choanocytes

Asconoid sponges are very small. The flagella of these can move water through the spongocoel. They have stalk-like spongocoel, which is covered with a single layer of choanocytes. Choanocytes are also called as the collar cells and they maintain the water current in the sponges. They have a central flagellum with a tuft of microvilli. Sponges feed on minute organisms and small organic particles, which enter the body through water current and are ingested by the choanocytes.

So, the correct answer is option C.