Question

Which of the following organs is enclosed in molluscs?

• A. Heart
• B. Kidneys
• C. Gonads
• D. All of the above

Answer 1

The correct option is D All of the above

Molluscs are mostly aquatic. Their soft bodies are enclosed in a hard shell made of calcium carbonate (CaCO3), which functions as an exoskeleton. This shell is secreted by the mantle, which encloses the internal organs such as heart, kidney, gonads etc. The mantle creates a small empty space called a mantle cavity, which is modified for different functions in different groups of molluscs.

Therefore, the correct answer is option D.