In case of poriferans, the spongocoel is lined with flagellated cells called as

Options

(a) Mesenchymal cells
(b) Ostia
(c) Oscula
(d) Choanocytes

Correct Answer:

Choanocytes

Explanation:

Choanocytes (collar cells) form the lining of spongocoel in poriferans (sponges). Flagella in collar cells provide circulation to water in water canal system.