Question

Radula and water vascular system are found in organism A and organism B respectively. Identify A and B.

• A. A - Locusta, B - Chiton
• B. A - Sea hare, B - Betta
• C. A - Tusk shell, B - Sea urchin
• D. A - Apis, B - Bombyx

Answer 1

Answer: (C)

Radula in Mollusca - It is a file like rasping organ in the mouth that helps in feeding.
Examples: Pila (Apple snail), Pinctada (Pearl oyster), Sepia (Cuttlefish), Loligo (Squid), Octopus (Devilfish), Aplysia (Seahare), Dentalium (Tusk shell) and Chaetopleura (Chiton).
A most important feature of Echinodermates: Presence of water vascular system. It performs the function of locomotion, capture and transport of food.
Examples: Asterias (Star fish), Echinus (Sea urchin), Antedon (Sea lily), Cucumaria (Sea cucumber) and Ophiura (Brittle star).