EVERYDAY SCIENCE

Detailed explanation-1: -Water enters very small pores found among the cells (pinacocytes), which line the outer surface of the sponge.

Detailed explanation-2: -Sponges are perforated by many tiny pores called ostia that permit water to enter one or more oscula (singular osculum) that let the water exit. These openings are connected by a series of canals, some of which are lined by collar cells called choanocytes whose flagella maintain a flow of water through the sponge.

Detailed explanation-3: -Sponges have a body wall penetrated by tiny openings, or pores, called. (AHS tee uh), through which water enters. The name of. the phylum, Porifera, refers to this system of pores.

Detailed explanation-4: -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-5: -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.