A) sponges
B) arthropods
C) Annelida
D) none of these
Correct Answer: A
Solution :
Choanocytes or collar cells are characteristic feature of members of phylum-Porifera as in sponges. These cells form endodermis of sponge. Each cells bears a contractile collar at the free end which encircles a single flagellum. Movement of water current takes place by movement of this flagellum. These cells help in food capturing and intracellular digestion in sponges. Phylum-Arthropoda is characterised by jointed legs. Phylum-Annelida is characterised by metamerism.
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