Question : Which of the following cells line the spongocoel and canals in members of the phylum Porifera?
Option 1: Somatic cells
Option 2: Collar cells
Option 3: White cells
Option 4: Sex cells
Correct Answer: Collar cells
Solution : The correct answer is Collar cells .
Choanocytes, also called collar cells, are special cells that cover the inside of the central cavity (spongocoel) and canals in sponges. These cells have tiny, hair-like structures called flagella. The flagella move in a coordinated way to create a flow of water that goes in one direction, towards the opening at the top called the osculum. This flow helps the sponge filter and collect nutrients from the water, kind of like a natural water pump for the sponge.
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