1. Sponges and Cnidarian Review

2. Sponges Which Phylum do Sponges belong to? What does Porifera mean?
Pore-bearing
For many years sponges were classed as plants. Why?

3. 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

4. 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

5. Sponges
What is the name for the large opening at the top of the sponge where the waste and new sponges exit?
Osculum

6. Sponges

7. Sponges What gives the sponge support? How do they reproduce?
Spicules or the spikes
How do they reproduce?
Sexual reproduction
Asexual reproduction
Do their “young” stay next to them? No

8. Sponges What is the advantage of having their young swim away? Facts!
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

10. Cnidarians Includes jellyfish, coral, and sea anemones
How do they move?
Slow swimming or don’t move at all
Do they chase their prey?
No, they move slowly they eat what they “bump” into

11. Cnidarians What do their use to kill or stun their prey?
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

12. Cnidarians http://www.aloha.com/~lifeguards/portjell.gif
Cnidarians

13. Cnidarians

14. Cnidarians – Sea Anemone

15. Cnidarians - Coral

16. Cnidarians What are the two body types that they can have?
Cnidarians
What are the two body types that they can have?
Polyp (sessile) Asexual
Medusa (swimming or free-floating)Sexual

17. 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.