Sponges and Cnidarians 6th Grade Chapter 17 Section 2 Notes pg. 501-503

Do 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!*

Objectives Students will… Describe the structures that make up sponges and cnidarians. Compare how sponges and cnidarians get food and reproduce. Review Self Check Homework

Sponges (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 predators What are spicules and spongin?

Sponges C. Sponge Reproduction - sponges can reproduces sexually and asexually There 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.

Cnidarians Characteristics of Cnidarians Include Jellyfish, Sea Anemones, Hydra and Coral Have radial symmetry Are hollow bodied animals with 2 cell layers that are organized into tissues. Have tentacles around their mouth to help catch food

Cnidarians-Body Forms 2 different body forms Polyp-vase shaped body (sea anemone or hydra) Medusa-free swimming bell shaped (jelly fish) Some cnidarians go through both stages during their life cycle

Cnidarian Reproduction (Pg. 503) Main Stages of Reproduction 1. Larva attaches to a surface 2. Polyp grows 3. Young medusa buds off (asexual reproduction) 4. Sexual reproduction-male medusa releases sperm and female releases eggs 5. New larve are produced

Sponges and Cnidarians http://www.ck12.org/user:kay.teehan@polk-fl.net/section/Sponges-and-Cnidarians/

To Review Name one difference between sponges and cnidarians. For Next Time…. Read pgs. 504-505 Define polyp and medusa on index cards

Flatworms and Roundworms 6th Grade Notes pg. 504-505

Do Now… How do sponges and cnidarians get their food? Sponges-filter food out of the water as it comes to them Cnidarians-actively capture prey with their tentacles that have stinging cells.

Objectives Students will Differentiate between flatworms and roundworms through the creation of a foldable

Flatworm/Roundworm Foldable Create foldable according to teacher instructions Characteristics Flatworms Roundworms Body Shape Body Openings Body Construction Digestive System Picture

Review Foldable Characteristics Flatworms Roundworms Body Shape Long and Flat Long and round Body Openings One Two Body Construction Three Layers Fluid-filled cavity between 2 tubes Digestive System Most do not have their own digestive system Have a digestive system Picture

Tapeworms 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

Videos Why parasites might not be all that bad Flatworms Roundworms

For Next Time… Read pgs. 506-508 Define organ, mollusks, mantle, gills and radula on index cards. Due on Friday, 11/1.