In the most simple type of canal system of Porifera, which of the following ways exhibit water flow?

Options

A. Ostia `rarr` Spongocoel `rarr` Osculum `rarr` Exterior
B. Spongocoel `rarr` Ostia `rarr` Osculum `rarr` Exterior
C. Osculum `rarr` Spongocoel `rarr` Ostia `rarr` Exterior
D. Osculum `rarr` Ostia `rarr` Spongocoel `rarr` Exterior

Answer

A

Explanation

The central body cavity of sponges is called spongocoel. Their body is porus. The inhalent pores are called ostia and exhalent pores are known as oscula. The body of a sponge is organised in such manner as to form a complex system of pores and canals. This system is called canal sydstem. Water flows in through ostia to spongocoel and comes out to exterior via osculum.