Discussion Questions 2/17/15 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 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 – water leaves through this hole at the top of the sponge Choanocyte Mesenchyme Epidermis Amoebocyte Pore Spicule Central Cavity Choanocytes – cells that use a flagellum to move a steady current of water through the sponge; also trap food & begin digestion process Osculum – water leaves through this hole at the top of the sponge Amoebocytes – cells that complete digestion of food particles & transfer nutrients throughout the sponge; also help make spicules Mesenchyme – jelly like middle layer where amoebocytes pick up nutrients Spicule – spike-shaped structure that makes up the skeletons of harder sponges; made of either chalklike calcium carbonate of glasslike silica
Porifera – General Characteristics Multicellular Heterotrophic – filter feeder Lack symmetry Matrix – mass of cells
Feeding Method Brought in by choanocytes (collar cells) & digestion begins intracellular (inside cell) Choanocytes release nutrients into mesenchyme Amoebocytes pick up nutrients, complete digestion, deliver nutrients to the sponge, & pick up wastes 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=mVavqt4Sbyo
Habitat Live attached to sea floor (sessile)
Ecology Some photosynthetic Provide habitats for other marine animals
Phylum Cnidaria
Cnideria - Structures/Functions Tentacles - arm-like structures around mouth, armed with cnidocytes Medusa - motile (free-swimming) cnidarian with mouth down Basal Disc - used to attach a polyp to rock or water plant Polyp - sessile cnidarian with mouth up Epidermis – outer layer of body wall Mesoglea – jelly like layer between inner & outer layers of body Gastrovascular Cavity - interior of hollow body Gastrodermis – inner layer of body wall Epidermis Tentacles Mesoglea G. Cavity Mouth Mouth G. Cavity Tentacles Epidermiss 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
Tissues – network of nerve cells Acoelomate 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
Enzymes digest the food Cells engulf digested food Cnideria – General Characteristics Enzymes digest the food Cells engulf digested food Undigested food passes out through mouth
Asexual – budding or regeneration Sexual Cnideria – Reproduction Asexual – budding or regeneration Sexual Hermaphroditic - produce both egg & sperm, but CANNOT self fertilize
Cnideria – Habitat & Ecology 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. 22