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Mollusks

Mollusks. 6 th Grade Notes pgs. 506-508 Mini Lab: modeling Cephalopod Propulsions. Review Now…. Get out foldable from last week about flatworms/round worms. Characteristics Flatworms Roundworms Body Shape Body Openings Body Construction Digestive System Picture. Objectives.

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Mollusks

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  1. Mollusks 6th Grade Notes pgs. 506-508 Mini Lab: modeling Cephalopod Propulsions

  2. Review Now… • Get out foldable from last week about flatworms/round worms. • CharacteristicsFlatwormsRoundworms • Body Shape • Body Openings • Body Construction • Digestive System • Picture

  3. Objectives • Students will… • Identify characteristics of mollusks • Compare the similarities and differences between an open and a closed circulatory system

  4. 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

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

  6. Mollusks (Conchs, Scallops, Snails, Octopus, Mussels) Characteristics of Mollusks • Gills for water dwelling and lungs for land dwelling • Radula- scratchy tongue like organ that has rows of fine, teeth-like projections that are used to scrape off small bits of food. • Mantle- a thin layer of tissue that covers the mollusk’s soft body • Shell for protection • Foot is used for moving or for anchoring the animal • Open circulatory system-do not have vessels to contain their blood. Blood washes over organs instead.

  7. Mollusks pgs. 507-508

  8. Cephalopods • Most complex type of mollusks (Nautilus, Octopus, Squid, Cuttlefish) • Internal plate instead of shell • Well-developed head and a “foot” that is divided into tentacles with strong suckers • Closed circulatory system-in which blood is carried through blood vessels instead of surrounding organs Adapted for quick movement

  9. For Next Time… • What are the six main characteristics of mollusks? • For Next time…. • Read pgs. 508-511 • Define open circulatory system and closed circulatory system on index cards.

  10. Segmented Worms 6th Grade Pgs. 508-511

  11. Do Now… • Name the 3 types of mollusks. • Give an example of each type.

  12. Objectives • Students will… • Describe the characteristics of segmented worms • Explain the digestive process of an earthworm

  13. Mini Lab- Modeling Cephalopod Propulsion • Purpose: To model cephalopod movement using balloons • Lab Procedures/Directions • Safety Precautions • Answer lab questions in complete sentences

  14. Segmented Worms • Other name: Annelids • Include: earthworms, leeches and marine worms • Four Characteristics • 1) Bodies are made of segments or rings • 2) Coelom or internal body cavity (separates the internal organs from body wall)\ • 3) Closed circulatory system • 4) Complete digestive system with 2 body openings (pg. 509)

  15. Earthworm Digestion

  16. Types of Segmented Worms

  17. Videos • Annelids • Leeches

  18. For Next Time… • Complete Self Check questions #1-4 pg. 511 in science notebook • Read pgs. 512-516

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