In sponges the cells lining the spongocoel and canals are
A{'text': 'Cnidocytes', 'label': 'A'}
B{'text': 'Choanocytes', 'label': 'B'}
C{'text': 'Flame cells', 'label': 'C'}
D{'text': 'Amoebocytes', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'Choanocytes', 'label': 'B'}
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: NCERT Class 11 Biology, Ch 4 "Animal Kingdom", §4.2.1_
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