Presentation on theme: "Sponges and Cnidarians"— Presentation transcript:
1Sponges and Cnidarians 6th GradeChapter 17 Section 2Notes pg
2Do Now… Write down all of the letters in the Alphabet (use uppercase). Circle the letters that have radial symmetry in red.Circle the letters that have bilateral symmetry in blue.Circle the letters that are asymmetrical in yellow.*Some letters may have more than 1 type of symmetry!*
3Objectives Students will… Describe the structures that make up sponges and cnidarians.Compare how sponges and cnidarians get food and reproduce.Review Self Check Homework
4Sponges (pg. 501-502) Characteristics of Sponges A. Filter Feeders - Sponges filter food from the water that flows through their bodies.-Do not make own food!B. Body Support and Defenses- spicules and spongin protect sponges from predatorsWhat are spicules and spongin?
5Sponges C. Sponge Reproduction - sponges can reproduces sexually and asexuallyThere are not male/female sponges!See chart on pg. 502 for more details.D. Sponges are Sessile-Adult sponges do not move from place to place.
6Cnidarians Characteristics of Cnidarians Include Jellyfish, Sea Anemones, Hydra and CoralHave radial symmetryAre hollow bodied animals with 2 cell layers that are organized into tissues.Have tentacles around their mouth to help catch food
7Cnidarians-Body Forms 2 different body formsPolyp-vase shaped body (sea anemone or hydra)Medusa-free swimming bell shaped (jelly fish)Some cnidarians go through both stages during their life cycle
8Cnidarian Reproduction (Pg. 503) Main Stages of Reproduction1. Larva attaches to a surface2. Polyp grows3. Young medusa buds off (asexual reproduction)4. Sexual reproduction-male medusa releases sperm and female releases eggs5. New larve are produced
12Do Now… How do sponges and cnidarians get their food? Sponges-filter food out of the water as it comes to themCnidarians-actively capture prey with their tentacles that have stinging cells.
13Objectives Students will Differentiate between flatworms and roundworms through the creation of a foldable
14Flatworm/Roundworm Foldable Create foldable according to teacher instructionsCharacteristicsFlatwormsRoundwormsBody ShapeBody OpeningsBody ConstructionDigestive SystemPicture
15Review Foldable Characteristics Flatworms Roundworms Body Shape Long and FlatLong and roundBody OpeningsOneTwoBody ConstructionThree LayersFluid-filled cavity between 2 tubesDigestive SystemMost do not have their own digestive systemHave a digestive systemPicture
16Tapeworms Type of parasitic flatworm To survive, it lives in the intestines of its host (including humans!)Since it does not have a digestive system, it absorbs nutrients from digested material in the host’s intestine.How do tapeworms get into humans?Tapeworm length activity
17VideosWhy parasites might not be all that badFlatwormsRoundworms
18For Next Time… Read pgs. 506-508 Define organ, mollusks, mantle, gills and radula on index cards.Due on Friday, 11/1.