NEET BIOLOGY

Detailed explanation-1: -Choanocytes (also known as “collar cells") are cells that line the interior of asconoid, syconoid and leuconoid body types of sponges that contain a central flagellum, or cilium, surrounded by a collar of microvilli which are connected by a thin membrane.

Detailed explanation-2: -One group of specialized cells found within sponges is called choanocytes. These cells cover the inside wall of the sponge and are comprised of a round cell body, a single whip-like flagellum, and a collar. The collar is made of many microvilli and is why these cells are also referred to as collar cells.

Detailed explanation-3: -noun. : a flagellated endodermal cell that lines the cavity of a sponge and has a contractile protoplasmic cup surrounding the flagellum. called also choanocyte.

Detailed explanation-4: -Choanocytes are the cells that line the spongocoel and canals of poriferans. They possess flagella and the cooperative movement of flagella filters the nutrients out from the water. Choanocytes are specialized cells that have a single flagellum surrounded by means of a net-like collar of microvilli.