Organisms of which of the following phylum are called sponges ?

Correct option is C

The correct answer is (c) Porifera. Organisms belonging to the phylum Porifera are commonly known as sponges. They are simple, multicellular organisms that primarily live in marine environments, although some species are found in freshwater. Sponges are characterized by their porous bodies, which are covered in tiny holes called ostia. These ostia allow water to circulate through the sponge's body, enabling it to filter feed by trapping nutrients and microorganisms. Information Booster: Sponges are the simplest of all multicellular animals and lack organs and true tissues. They are mostly sessile (non-moving) and attach themselves to surfaces like rocks or the ocean floor. Sponges have a skeleton made up of spicules (tiny, hard structures) or spongin (a fibrous material), providing them with structural support. They play a significant role in marine ecosystems as filter feeders, helping to clean water and recycle nutrients.