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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.