EVERYDAY SCIENCE

Detailed explanation-1: -All adult sponges are sessile, meaning they live permanently attached to rocks or other submerged objects and do not move about on their own. Some sponges grow in thin encrusting layers over surfaces (Fig.

Detailed explanation-2: -sessile In zoology, describing an animal that remains fixed in one place. Sedentary animals, such as barnacles, limpets and mussels, are usually permanently attached to a surface. The term sessile is also used to describe the eyes of crustaceans that lack stalks and sit directly on the animal’s head.

Detailed explanation-3: -Sessile species are found in three families: Atrochidae (two genera), Collothecidae (two genera), and Flosculariidae (nine genera).

Detailed explanation-4: -For example, a sessile alga that lives on a rock (its substrate). Another example is a barnacle that lives on the bottom of a ship. Mussels and coral polyps are also examples of sessile organisms. Coral is sessile by creating its own substrate to grow from.