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Name ____________________________ Date: _____________ Hr.________ Reading Study Guide Answer Key Chapter 11 Mollusks, Arthropods, and Echinoderms 11-1 Mollusks (pp.340-345) Page 340 1. From the shells of clams Native Americans made wampum belts. 2. Name one use for a wampum belt. Wampum belts are used for recording a group’s history, honoring a new chief and exchanged when warring group’s make peace. Characteristics of Mollusks (p.340-341) 3. What is a MOLLUSK? A mollusk is an invertebrate with a soft, unsegmented body; most are protected by hard outer shells. 4. The thin layer of tissue that covers a snail's internal organs is called the mantle. Name the 3 functions of a mollusks foot. 5. Crawling 6. Digging 7. Catching Prey 8. Mollusks have a digestive system with a single opening(s). 9. Mollusks have bilateral symmetry? 10. Most mollusks have a/an open circulatory system. 11. Which organs of a mollusk obtain oxygen from the water? gills Snails and Slugs (p.342) Name the 3 Groups of Mollusks 12. Gastropods 13. Bivalves 14. Cephalopods 15. The gastropods are the largest group of mollusks. 16. How many shells do gastropods have? Single or no shell 17. Animals that eat only other animals are called carnivores. 18. Animals that eat only plants are called herbivores. 19. Describe a RADULA. A radula is a flexible ribbon of teeth that act like sandpaper. 20. The oyster drill uses it radula to bore a hole through an oyster's shell. 21. How does a gastropod move? The gastropod uses their broad foot to move. 22. A gastropod's foot oozes mucus which makes it easier to move. Two-Shelled Mollusks (p.342) 23. What are BIVALVES? Bivalves are a type of mollusk that has two shells held together by hinges and strong muscles. Name 4 bivalves. 24. clams 25. oysters 26. scallops 27. mussels 28. Bivalves do not have radulas, instead, most are filter feeders. 29. Most bivalves are omnivores; they eat both plants and animals. 30. Name the bivalve in Figure 2. Giant clam 31. Name the bivalve that makes a pearl. Oysters Octopuses and Their Relatives (p.344-345) 32. What is a CEPHALOPOD? Mollusks whose feet are adapted to form tentacles around their mouth. 33. Name a cephalopod with an external shell. Nautiluses 34. Name a cephalopod with a shell inside their body. Squids, cuttlefish 35. Name a cephalopod that does not have a shell. Octopus Circle all the correct answers about cephalopods. 36. Cephalopod circulatory system: Closed circulatory system Open circulatory system 37. Obtaining food: Herbivore Carnivore Omnivore 38. Cephalopod suckers: Touch Taste Smell 39. Cephalopod eyes: Small Large 40. Cephalopod Vision: Poor Good Excellent 41. Cephalopod brains: Small Large 42. Describe how a cephalopod moves. They squeeze a current of water out of a cavity through a tube; the tube steers direction. Cephalopods use jet propulsion. It's About You 43. Check the mollusks you have eaten. Circle the check mark if you liked it! Clams _______ Oysters ______ Scallops ______ Snails (Escargot) ______ Squid (Calamari) ______ Mussels ________ Extra Credit There are approximately 150,000 species of mollusks. 27 percent are gastropods. About how many species of gastropods are there? 40,500 To solve: 150,000 X .27 = 40,500 gastropods.