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Sponges and Cnidarians

Sponges and Cnidarians. 6 th 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.

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Sponges and Cnidarians

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

  2. 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!*

  3. 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

  4. 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?

  5. 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.

  6. 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

  7. 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

  8. 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

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

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

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

  12. 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.

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

  14. Flatworm/Roundworm Foldable • Create foldable according to teacher instructions

  15. Review Foldable

  16. 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

  17. Videos • Why parasites might not be all that bad • Flatworms • Roundworms

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

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