Large opening in a sponge through which water flows out of the sponge. There can be more than one osculum in them while ostia are a series of tiny pores which are present all over the body of a sponge.
Further explanation
Sponge
They are multicellular, heterotrophic organisms which belongs to phylum porifera. There are three types of sponges which are syconoid, asconoid, and leuconoid.
Osculum
It is an excretory structure in the living sponge, a huge opening to the outside through which flow of water exits in the wake of going through the spongocoel. Waste material diffuses into the water and the water is siphoned through the osculum. Sponge siphon pumps huge volumes of water; all in all, a volume of water equivalent to the wipe's body size is siphoned at regular intervals. The size of the osculum is controlled by contractile myocytes. Its size is one of the elements which decides the measure of water moving through the sponge. It tends to be shut totally in light of overabundance residue in the water.
Ostia
They are present in the form of pores on the body of sponge and a single pore is called osteum.
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Subject: Biology
Level: High school
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