alleryIn sponges the cells lining the spongocoel and canals are
ACnidocytes
BChoanocytes
CFlame cells
DAmoebocytes
Answer & Solution
Correct answer: B. Choanocytes
1. Sponges have a specialised cell type lining the spongocoel and inner canals.
2. These are called choanocytes or collar cells because of the collar-like ring around the flagellum.
3. Choanocytes drive the water current through the canal system.
4. Cnidocytes belong to cnidarians; flame cells to flatworms; amoebocytes assist digestion in sponges.
_Source: syllabus Biology, Ch 4 "Animal Kingdom", §4.2.1_
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