Feeding: water passes through tiny current pores, collar cells capture and ingest food carried by the current. The rest of the water is carried through the osculum with the flagellum on the amoeboid cells..They are what you call filter feeders.
Sponges Feeding
Internal Transport:Do not have a transport system. They are essentially colonies of independent cells, each able to exchange materials with the sea water.
Sponge's Internal Transport System
Sponge's Response to stimuli
Response:Songes have no individual cells or organs that are specialised to detect environmental stimuli .Sponges do, however, show a number of simple behavioural responses. These include closing the external body openings.
Reproduction:Sponges may reproduce sexually and asexually. Most sponges are both male and female. In sexual reproduction, they may play either role. The ‘male’ sponge would release sperm into the water, which would travel and then enter a ‘female’ sponge. After fertilization in the sponge, a larva is released into the water. It floats around for a few days and then sticks to a solid to begin its growth into an adult sponge.
Respiration: Water comes into contacts with the sponge. The water is absorbed through the pores on the outer layer of the sponge. Flagellated structures absorb the oxygen and then pass it over to the cells which function as any type of cell. Water and gases that are no longer needed are pumped through the cavity and out the osculum.
sponge's Respiration
Excretion: A sponge execretes unecessary substances the same way it takes in food. The water flows through the sponge's pores and filters out the waste that the sponge needs to get rid of. Once the water flows through the pores, the execretion exits out through those pores.
Sponge's Excretion
Movement:Sponges are sessile for most of their live except when they product larvae. The larvae swims around for days and attach to ocean floor.