A) jelly fish
B) sponges
C) helminthes
D) echinoderms
Correct Answer: B
Solution :
The cavity common to all sponges is spongocoel or paragastric cavity. It is lined by endoderm which contains a single layer of collared, flagellated cells, called choanocytes. Each cell contains a single nucleus, 1-2 contractile vacuoles, food vacuoles, blepharoplast, rhizoplast and a single basal granule (kinetosome) from which originates a single, long, whip like flagellum.
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