Question

The shell in molluscs is secreted by

• A. Foot
• B. Gill
• C. Pallium
• D. Operculum

Answer 1

The correct option is C

Pallium

In the typical mollusc, a soft and spongy layer of skin forms a mantle over the visceral hump. This secretes the outer shell. The space between the hump and the mantle is called the mantle cavity in which feather-like gills are present. They have respiratory and excretory functions. The foot is used for locomotion. In many molluscs, the foot typically bears an operculum that seals the shell opening (aperture) when the head-foot is retracted into the shell.