EVERYDAY SCIENCE

Detailed explanation-1: -Remember, sponges live attached to the seafloor. Because they are attached, they are called sessile. In order obtain food, sponges pass water through their bodies in a process known as filter-feeding. Water is drawn into the sponge through tiny holes called incurrent pores.

Detailed explanation-2: -Feeding and digestion The Porifera are primarily filter feeders, utilizing food particles suspended in the water and captured by the choanocytes. Food particles consist essentially of bacteria, other microorganisms, and particles of organic debris; sponges also probably absorb dissolved organic substances.

Detailed explanation-3: -Sponges are a type of suspension feeder, but because they actively pump water through their bodies, they are more specifically called filter feeders. Other examples of filter feeders include clams and mussels. Some suspension feeders, like corals, do not actively pump water through their bodies.

Detailed explanation-4: -So, the correct answer is ‘Sessile’.

Detailed explanation-5: -Today, filter feeders like clams, sponges, krill, baleen whales, fishes, and many others fill the ocean, spending their days filtering and eating tiny particles from the water.