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Q.
Collar cells form the lining of spongocoel in
NTA AbhyasNTA Abhyas 2020Animal Kingdom
Solution:
Sponges have a water transport canal. The cavity common to all sponges is the spongocoel. It is lined by endoderm, which contains a single layer of flagellated cells, called choanocytes. The water pathway helps them in food gathering, respiratory exchanges and removal of waste.