EVERYDAY SCIENCE

Detailed explanation-1: -The sponges have the internal skeleton made up of spicules or spongin. They are basically the calcium carbonate or silicon fragments. This makes their body flexible.

Detailed explanation-2: -The exoskeleton of sponges (so, the parts that you see) are composed of a mixture of spongin and/or spicules. Spongin is a modified type of collagen protein, and forms the “fibers” or “mortar” that hold spicules together. Generally, species are identified based on the presence or absence of spongin in a sample.

Detailed explanation-3: -Skeleton of sponges is made of spicules or spongin fibres. Spicules are formed of calcium carbonate and silica.

Detailed explanation-4: -Spongin is the flexible material that makes up the body wall of the sponge, while spicules are hard, spiny secretions that help to provide a reinforced structure.

Detailed explanation-5: -Besides supporting sponge cells, spicules can help larvae stay buoyant while in the plankton or reach the bottom at settlement, enhance reproduction success, or catch prey. Conversely, the role of spicules and skeletons in deterring predation has not been demonstrated.