alleryThe hard calcareous shell of a mollusc is secreted by which structure?
AMantle
BVisceral mass
CFoot
DTube-feet
Answer & Solution
Correct answer: A. Mantle
1. In molluscs the visceral mass is covered by the mantle.
2. The mantle secretes the hard calcareous shell.
3. Rule out visceral mass: it is covered by the mantle, it does not secrete the shell.
4. Tube-feet belong to echinoderms, not molluscs.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 6 "Animal Classification", p.79_
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