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2/17/15 Discussion Questions Using your textbook, journal, handouts, or smart phone please complete the following: 1. Please compare and contrast Phylum Porifera and Phylum Cnidaria Reminders Animal Exam 3-11-15 Root word quiz 3-10-15 Phyla Books due the day of the test - 3-11-15 Zoo Trip 3-4-15 Go to room 1135 Tues or Thurs for Science Peer Tutoring during PLC 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 PLC Flip it over when you are finished and hang on to it Today’s Objective: OBJECTIVES: Describe and Explain the characteristics of Phyla Porifera and Phylum Cnidaria Phylum Porifera “Sponges” Osculum Choanocytes – cells leaves that usethrough a flagellum to hole moveat a Osculum – water this steady current of water through the sponge; also toplike ofmiddle the sponge trap food &the digestion process Amoebocytes Mesenchyme ––begin cells jelly that complete layer digestion where of food Choanocyte Mesenchyme particles & transfer nutrients throughout the sponge; amoebocytes pick upEpidermis nutrients also help make spicules Spicule – spike-shaped structure that makes up the skeletons of harder sponges; made of either chalklike Amoebocyte calcium carbonate of glasslike silica Pore Spicule Central Cavity Porifera – General Characteristics Multicellular Heterotrophic – filter feeder Lack symmetry Matrix – mass of cells 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 pores 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 Habitat Live attached to sea floor (sessile) Ecology Some photosynthetic Provide habitats for other marine animals Phylum Cnidaria Cnideria - Structures/Functions Tentacles Polyp Disc Basal Medusa Epidermis Mesoglea Gastrodermis Gastrovascular - sessile - –-motile –-arm-like jelly outer used – Cavity cnidarian inner like (free-swimming) layer tostructures layer attach layer -ofinterior with body between ofa body polyp mouth around wall of wall toup Tentacles cnidarian inner mouth, rock &orouter armed with water hollow mouth layers plant with body down of body cnidocytes Mouth G. Cavity Epidermis Mesoglea G. Cavity Mouth Tentacles Epidermis s Gastrodermis Gastrodermis Basal Disk Polyp Medusa Cnideria - Structures/Functions Cnidocyte - stinging cell; used to stun/ paralyze prey Nematocyst – small barbed stinging structure to capture prey Cnideria – General Characteristics Multicellular Radial symmetry Tissues – network of nerve cells Acoelomate Cnideria – Feeding Method Tentacle with cnidocytes paralyze prey Tentacles move food into mouth then into gastrovascular cavity Cnideria – General Characteristics Enzymes digest the food Cells engulf digested food Undigested food passes out through mouth Cnideria – Reproduction Asexual – budding or regeneration Sexual Hermaphroditic - produce both egg & sperm, but CANNOT self fertilize Cnideria – Habitat & Ecology 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 Power Point Analysis for Animals New Groups Work on the animal handouts you picked up at the door today and those from Fri. Work on your Animal Phyla Booklet (booklet will not go in your journal)….everything else will as usual.