Presentation on theme: "Sponges and Cnidarian Review. Sponges Which Phylum do Sponges belong to? –Porifera What does Porifera mean? –Pore-bearing For many years sponges were."— Presentation transcript:
Sponges and Cnidarian Review
Sponges Which Phylum do Sponges belong to? –Porifera What does Porifera mean? –Pore-bearing For many years sponges were classed as plants. Why?
Sponges Why are Sponges now classified as animals? –They do not produce their own food! Do sponges have tissues or organs? –NO! Which type of symmetry do they have? –Radial 9LmXiYAx4KbyLEw
Sponges How do sponges get their food? –Extract it from water as it flows through the sponge What are the openings known as that the water can flow through? –Pores Which cells use their tails to remove food from the water? –Collar cells
Sponges What is the name for the large opening at the top of the sponge where the waste and new sponges exit? –Osculum
Sponges What gives the sponge support? –Spicules or the spikes How do they reproduce? –Sexual reproduction –Asexual reproduction Do their young stay next to them? –No
Sponges What is the advantage of having their young swim away? –They will not be competing for resources with them Facts! Sponges are sessile – fused to the ground Larval stage is free swimming Radial symmetry helps them detect things all around themselves
Cnidarians Includes jellyfish, coral, and sea anemones How do they move? –Slow swimming or dont move at all Do they chase their prey? –No, they move slowly they eat what they bump into
Cnidarians What do their use to kill or stun their prey? –Stinging cells –Cnidocytes – cell name –Nematocysts – harpoon like structure that they fire once to stun the prey
Cnidarians What are the two body types that they can have? –Polyp (sessile) Asexual –Medusa (swimming or free-floating)Sexual
Cnidarians What type of symmetry do they have? –Radial They have a nerve net which they use to detect and sense what is around them Where does the undigested food go? –Back through their mouth because they have only 1 opening.