EVERYDAY SCIENCE

Detailed explanation-1: -The pores on Sponges’ bodies are ostia. Sponges contain many pores on their bodies, which enable water to enter. In some sponges, ostia are formed by porocytes, which are solitary tube-shaped cells that act as valves to regulate the flow of water into the spongocoel.

Detailed explanation-2: -Ostia are minuscule pores present on the body walls of sponges. They are formed by porocytes which are tube-shaped cells that function as valves to allow fluid exchange. The water enters via the Ostia into the spongocoel, the central cavity of the sponge.

Detailed explanation-3: -The body of a sponge forms a wall around a large central cavity through which water is circulated continually. Water enters through pores located in the body wall and leaves through the osculum, a large hole at the top of the sponge.

Detailed explanation-4: -All sponges have ostia, channels leading to the interior through the mesohyl, and in most sponges these are controlled by tube-like porocytes that form closable inlet valves.

Detailed explanation-5: -These pores are sometimes also referred to as ostia, and they provide openings for water, which carries planktonic food and oxygen, to enter the sponge body (Fig. 3.19). Simple vase-like sponges have a single large top opening, called the osculum through which water leaves the sponge.