Question

A current of water enter ostia and reaches the sponge and then comes out through the oscula. This system is called as

• A. Water vascular system
• B. Bathing system
• C. Circulatory system
• D. Canal system

Answer 1

The correct option is D Canal system

Sponges are diploblastic and it belongs to Porifera. It has small pores on the body wall known as an Ostia. Water enters the body and flows through a system of crisscrossing canals collectively forming the canal system. The extra water is expelled by a large opening at the top is known as osculum.

So, the correct answer is option D.