NEET BIOLOGY

Detailed explanation-1: -Although other animals at the reef are said to filter-feed, the method used by sponges is unique to this simple group of animals. In fact, sponges are named because of the many pores covering their bodies. They belong to the Phylum Porifera and may be called poriferans.

Detailed explanation-2: -Summary. Sponges are sessile filter feeders.

Detailed explanation-3: -In addition to the osculum, sponges have multiple pores called ostia on their bodies that allow water to enter the sponge. In some sponges, ostia are formed by porocytes, single tube-shaped cells that act as valves to regulate the flow of water into the spongocoel.

Detailed explanation-4: -PORIFERA-THE SPONGES Members of the phylum lack tissues or organs and consist of only two layers of cells. They are filter feeders and are distinguished by having so called collar cells that are ciliated and responsible for food uptake.