EVERYDAY SCIENCE

Detailed explanation-1: -Sponges have cellular-level organization, meaning that that their cells are specialized so that different cells perform different functions, but similar cells are not organized into tissues and bodies are a sort of loose aggregation of different kinds of cells.

Detailed explanation-2: -Choanocytes. These distinctive cells line the interior body walls of sponges. These cells have a central flagellum that is surrounded by a collar of microvilli.

Detailed explanation-3: -Classification of Phylum Porifera Their skeleton is composed of calcareous spicules made of calcium carbonate. The body is cylindrical and exhibits radial symmetry. The body organization is asconoid, syconoid, or leuconoid.

Detailed explanation-4: -Although sponges have no muscle tissue and are sessile organisms, they do have muscle-like cells called myocytes. Myocytes surround canal openings and porocytes. These cells are able to contract in order to regulate water flow through the body.

Detailed explanation-5: -Three principal types of cells may be distinguished-choanocytes, archaeocytes, and pinacocytes–collencytes.