1. Bell work 1.Label the regions of the diagram below: What type of symmetry to the following pictures have:

4. General Reminders If you did not pass your exam remember you must come in to AST to correct your test and retest for a higher grade. Saturday School 4/2 9:00-12:00 Test date 4/7 Journals Due 4/7 EOC Tutoring Tuesday 7:35-8:15 in Mrs. Owens’ Room 1241 Tuesday 3:50-4:30 in Mrs. Cochrane’s Room 1228 Wednesday 7:35 – 8:15 in Coach Rich’s Room 1107 Thursday 7:35-8:15 in Mrs. Schneider’s Room 1240 Thursday 3:50-4:30 in Mrs. Schneider’s Room 1240

5. QUIZ Clear your desks of everything Do NOT write on the quiz please Use CAPITAL letters please Keep your answers covered If you need to make up a quiz due to an absence… come see me Tues or Thurs during AST Flip it over when you are finished and hang on to it.

6. Today’s Objective: OBJECTIVES: Describe and Explain the characteristics of Phyla Porifera and Phylum Cnidaria

7. Phylum Porifera “Sponges”

8. Osculum Choanocyte Mesenchyme Epidermis Amoebocyte Pore Spicule Central Cavity Osculum – water leaves through this hole at the top of the sponge Choanocytes – cells that use a flagellum to move a steady current of water through the sponge; also trap food & begin digestion process Mesenchyme – jelly like middle layer where amoebocytes pick up nutrients Amoebocytes – cells that complete digestion of food particles & transfer nutrients throughout the sponge; also help make spicules Spicule – spike-shaped structure that makes up the skeletons of harder sponges; made of either chalklike calcium carbonate of glasslike silica

9. Porifera – General Characteristics Multicellular Heterotrophic – filter feeder Lack symmetry Matrix – mass of cells

10. Feeding Method 1. Brought in by choanocytes (collar cells) & digestion begins intracellular (inside cell) 2. Choanocytes release nutrients into mesenchyme 3. Amoebocytes pick up nutrients, complete digestion, deliver nutrients to the sponge, & pick up wastes 4. Waste removed by osculum

11. Reproduction Asexual – budding Gemmules – group of amoebocytes surrounded by a protective layer; these form when environmental conditions are harsh Sexual – can produce egg and sperm, but CANNOT self fertilize http://www.youtube.com/watch?v=mVavqt 4Sbyo

12. Habitat Live attached to sea floor (sessile)

13. Ecology Some photosynthetic Provide habitats for other marine animals

14. Phylum Cnidaria

15. Tentacles Tentacles Mouth G. Cavity Epidermis s Gastrodermis Basal Disk Gastrodermis Mesoglea G. Cavity Epidermis Cnideria - Structures/Functions MedusaPolyp Mouth Polyp - sessile cnidarian with mouth upBasal Disc - used to attach a polyp to rock or water plant Medusa - motile (free-swimming) cnidarian with mouth down Epidermis – outer layer of body wallMesoglea – jelly like layer between inner & outer layers of body Gastrodermis – inner layer of body wallGastrovascular Cavity - interior of hollow body Tentacles - arm-like structures around mouth, armed with cnidocytes

16. Cnidocyte - stinging cell; used to stun/ paralyze prey Nematocyst – small barbed stinging structure to capture prey Cnideria - Structures/Functions

17. Multicellular Radial symmetry Tissues – network of nerve cells Acoelomate Cnideria – General Characteristics

18. Tentacle with cnidocytes paralyze prey Tentacles move food into mouth and then gastrovascular cavitymouth then into gastrovascular cavity Cnideria – Feeding Method 

19. Enzymes digest the food Cells engulf digested food Undigested food passes out through mouth Cnideria – General Characteristics

20. Asexual – budding or regeneration Sexual Hermaphroditic - produce both egg & sperm, but CANNOT self fertilize Cnideria – Reproduction

21. Habitat Most marine; few fresh water Ecology Balance the amount of smaller living things living in water Provide cleaner water Help create coral reefs & biodiversity Cnideria – Habitat & Ecology