50. In case of poriferans the spongocoel is lined withflagellated cells called :
(1) Ostia (2) Oscula
(3) Choanocytes (4) Mesenchymal cells
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Answer:
3
Choanoacytes
Explanation:
flagellated cell with a collar of protoplasm at the base of the flagellum, numbers of which line the internal chambers of sponges
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