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Question

The cell labelled as 'A' is actually characteristic feature of which phylum?
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A
Cnidaria
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B
Porifera
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C
Protozoa
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D
Bacteria
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Solution

The correct option is B Porifera
Choanocytes (also known as collar cells) are cells that line the interior of sponges that contain a central flagellum surrounded by a collar of microvilli which are connected by a thin membrane. It is a characteristic feature of which phylum Porifera.
So, the correct answer is option B.

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