- A Radula
- B Mantle
- C Spicule
- D Madreporite
Correct answer: A. Radula
Explanation: The radula is a file-like rasping organ found in the mouth of most molluscs, used to scrape food. The mantle covers the visceral hump.
Concept context
Phylum-level classification of the animal kingdom from Porifera to Chordata, based on body symmetry, coelom, and segmentation. One of the most example-heavy chapters for NEET.