In poriferans, the spongocoel is lined with flagellated cells A. Ostia B. Osculum C. Mesenchymal cells D. Choanocytes
Option D. Spongocoel is a large central cavity in the sponges. Water enters through the numerous ostium in the cavity and exit by a central pore known as osculum. Choanocytes are the flagellated cells which line the spongocoel. It helps to set up water current and helps in intake of food.
