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Lecture 63

Lecture 63. Mr. Sover 16-17 February 2010. Collect Homework. Pass back homework? Go over homework. Animal Adaptations. Groups. Invertebrates. What are they? What percentage of animals are they?. Body Symmetry. Asymmetrical Radial symmetry Cnidarians (picture a bike)

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Lecture 63

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  1. Lecture 63 Mr. Sover 16-17 February 2010

  2. Collect Homework • Pass back homework? • Go over homework

  3. Animal Adaptations • Groups

  4. Invertebrates • What are they? • What percentage of animals are they?

  5. Body Symmetry • Asymmetrical • Radial symmetry • Cnidarians (picture a bike) • Bilateral Symmetry • Anterior vs. posterior • Dorsal vs. ventral

  6. Sponge • Least complex invertebrate • Composition • Two layers of cells • Central Cavity • How do they obtain oxygen/food?

  7. Reproduction • Asexual/sexual • Asexual – fragments • Sexual – hermaphroditic (sperm/eggs)

  8. Sponges!

  9. Cnidarians • Jellyfish, corals, sea anemones • No longer just two cell layers, but two tissue layers • Outer is called the ectoderm • Inner is called the endoderm

  10. Portuguese Man o' War • Box Jellyfish Lion’s Mane

  11. Reproduction • Sexually • Jellyfish which are hermaphrodites • Asexually • Polyps - buds

  12. Homework • Read pp. 456-462 and do 1-3 and 5 on page 462.

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