Which of the following cells act as primary filter feeding cells in porifera?
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Choanocytes, also known as collar cells, are the primary filter-feeding cells in porifera (sponges). These specialized cells line the internal chambers (spongocoel) of the sponge. They possess a flagellum surrounded by a collar of microvilli. The beating of the flagellum creates a water current that draws water through the sponge's body, and food particles (such as bacteria and plankton) are trapped by the sieve-like collar of microvilli and then ingested by phagocytosis.
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