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STUDY GUIDE: PORIFERA 12. How do collar cells draw water through a sponge? NAME____________________________________________________ 1. Is a natural sponge a VERTEBRATE or INVERTEBRATE? 13. How do sponges get their food? 2. What type of symmetry do most sponges have? 14. How do sponges obtain oxygen? 3. What is a sessile organism? Label the following parts on the diagram and color them as indicated. NOTE: SOME WORDS ARE USED MORE THAN ONCE. : Collar cell (red); Digestive 4. Why are sponges considered to be the simplest multicellular organism? cavity (green); Epidermal cell (yellow); Flagella; Mesoglea (brown); Osculum; Pore (blue) Spicule (purple). 5. How do sponges reproduce asexually? (2 ways) 6. What is meant by hermaphroditic? 7. How do sponges get rid of their wastes? 8. What is the function of a pore cell in a sponge? 9. How are sponges classified? 10. What is a spicule? 11. What is the function of a sponge’s osculum?
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