Which phylum possesses a rasping feeding organ called a radula and a mantle that secretes a calcareous shell?
Answer and explanation
Correct answer: A. Mollusca
- Step 1: Molluscs (snails, clams, squids) have soft unsegmented bodies divided into head, visceral mass, and muscular foot. Step 2. Most molluscs possess a chitinous toothed ribbon (radula) for feeding and a dorsal mantle fold secreting calcium carbonate shells. Answer: Mollusca. Why not the others: Echinoderms possess Aristotle's lantern; Brachiopods have lophophores; Cnidarians lack radula.
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