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

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

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.

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

Phylum Porifera “Sponges”

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

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 osculum

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 4Sbyo

Habitat Live attached to sea floor (sessile)

Ecology Some photosynthetic Provide habitats for other marine animals

Phylum Cnidaria

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

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

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

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

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

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

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