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  1. In case of poriferans, the spongocoel is lined with flagellated cells called:
    1. oscula
    2. choanocytes
    3. mesenchymal cells
    4. ostia
Correct Option: B

In poriferans (sponges) choanocytes (collar cells) form lining of spongocoel. Flagella present in collar cells provide circulation to water in water canal system.



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