NEET BIOLOGY

Detailed explanation-1: -Instead of mouths, they have small holes called pores spread over their bodies. These holes allow water to enter, move to the inside of the sponge, and then exit through an opening in the top of the sponge. As the water travels through their bodies, the sponges absorb oxygen and other nutrients dissolved in the water.

Detailed explanation-2: -Sponges (Figure below) are classified in the phylum Porifera, from the Latin words meaning “having pores.” These pores allow the movement of water into the sponges’ sac-like bodies. Sponges must pump water through their bodies in order to eat.

Detailed explanation-3: -Sponges are similar to other animals in that they are multicellular, heterotrophic, lack cell walls and produce sperm cells. Unlike other animals, they lack true tissues and organs. Some of them are radially symmetrical, but most are asymmetrical.

Detailed explanation-4: -So how do sponges eat? Sponges are mostly filter feeders and they eat detritus, plankton, viruses and bacteria. They also absorb dissolved nutrients directly from the water through their pinacocyte cells; each cell is responsible for getting their own food!