1. Flatworms Roundworms Mollusks Segmented Worms
Chapter 22
Flatworms
Roundworms
Mollusks
Segmented Worms

2. Which is a true statement about a bilaterally symmetrical animal?
(a) it has sense organs on the anterior end
(b) it has sense organs on it’s posterior end
(c) it does not display any type of movement
(d) it is lacking a posterior

3. a

4. The excretory system of planarians is composed primarily of bulblike structures called
(a) pharynxes (b) trematoda (c) bladders (d) flame cells

5. D. flame cells

6. One difference between nematodes and flatworms is that nematodes have a digestive system with
(a) no posterior end (b) one opening (c) two openings (d) a mouth

7. C. two openings

8. The proglottids of a tapeworm has a complete
(a) circulatory system (b) digestive system (c) reproductive system (d) respiratory system

9. C. reproductive system

10. Uncooked or poorly cooked pork may contain
(a) pinworms (b) trichina worms (c) hookworms (d) free-living roundworms

11. B. Trichinia Worms

12. A ______ has a muscular tube called the pharynx, which can be extended outside the body to suck in food
(a) ascaris (b) tapeworm (c) planaria (d) jellyfish

13. C. Planaria

14. Ascaris, hookworm, and trichina are all examples of
(a) free-living roundworms (b) free-living flatworms (c) parasitic flatworms (d) parasitic roundworms

15. D. Parasitic Roundworm

16. This flatworm lives in the liver of sheep and can cause Schistosomiasis in humans
(a) tapeworms (b) fluke (c) planaria (d) hookworm

17. B. Fluke

18. Phylum of flatworms
(a) Platyhelminthes (b) Nematoda (c) Coelenterata
(d) Rotifera

19. A. Platyhelminthes

20. Only worms in this section that have separate sexes
(a) Roundworms (b) Tapeworms (c) Planaria (d) Flatworms

21. A. Roundworm

22. Which of the following is not a roundworm?
(a) Ascaris (b) Hookworm (c) Planaria (d) Trichina

23. C. Planaria

24. This flatworm which belongs to the class Turbellaria has eyespots that detect light
(a) hookworm (b) fluke (c) tapeworm (d) planaria

25. D. Planaria

26. Members of the phylum Annelida include earthworms, leeches, and
(a) chitons (b) some mollusks (c) cephalopods (d) many segmented marine worms

27. D.

28. How do earthworms increase the nutrients available to plants?
(a) by destroying harmful bacteria
(b) by breaking down large pieces of organic matter
(c) by organizing soil into larger clumps
(d) leaving parts of their prey to decay in the soil

29. B.

30. In bivalves, particles of food are trapped by mucus that coats the
(a) stomach (b) radula (c) pharynx (d) gills

31. D. gills

32. Earthworms have four small setae on each segment
Earthworms have four small setae on each segment. How many parapodia do they have on each segment?
(a) two (b) four (c) eight (d) zero

33. D. zero

34. The snail, clam, and squid all have a common feature. What is it?
(a) flame cells (b) a foot (c) tentacles (d) stinging cells

35. B. a Foot

36. What food obtaining adaptation makes filter feeding unnecessary for a squid?
(a) mantle cavity (b) beaklike jaws (c) foot (d) visceral mass

37. B. beaklike jaws

38. The hard shell like structure you removed from the squid was called the
(a) mantle (b) armor (c) pen (d) pencil

39. C. Pen

40. Which of the following is not in the phylum Mollusca
(a) snails (b) earthworms (c) squid (d) clams

41. B. Earthworms

42. Snails are adapted to live on land, but they need moisture to survive
Snails are adapted to live on land, but they need moisture to survive. They are most active during
(a) afternoon (b) dry periods (c) early morning (d) I don’t know, mark it wrong

43. C. Early Mornings

44. Univalves have a
(a) single shell (b) double shell (c) bombshell (d) no shell

45. A. Single shell

46. Which organ of the earthworm functions to store food?
(a) gizzard (b) crop (c) intestine (d) stomach

47. B. Crop

48. This class of Annelids has no bristles and is an external parasite
(a) Oligochaeta (b) Polychaeta (c) Hirudinea (d) Cephalopoda

49. C. Hirudinea

50. A tapeworm has its reproductive organs in segments called

51. Proglottid

52. Organism that has both male and female parts

53. Hermaphrodite

54. Organism that has no coelom

55. acoelomate

56. The knob shaped head of a parasitic tapeworm

57. scolex

58. Concentration of receptors and nerves at the anterior end

59. ganglia

60. Obtain nourishment from living in another organism

61. parasite

62. Being able to cut into equal left and right halves

63. Bilateral symmetry

64. Organism that has a “false” body cavity

65. pseudocoelomate

66. Performs like a kidney in annelids

67. nephridia

68. Distinct swelling on earthworm involved in reproduction

69. clitellum

70. Tongue-like scraping structure in snails

71. radula

72. Thick membrane that secretes the shell in mollusks

73. mantle

74. Pairs of tubes that pump blood

75. Aortic arches

76. Sacs which store sperm

77. Seminal vesicles

78. Mollusks with two shells

79. bivalves

80. Final Question

81. Organs specialized for the exchange of gases in water

82. gills

83. What is the difference between free-living and parasitic organisms?

84. Free living gets all of its own resources on its own, parasites rely on a host to supply its resources

85. Describe the path by Ascaris through the human body
Describe the path by Ascaris through the human body. Make sure you name all of the structures or organs it goes thru.

86. a. Eggs or larvae enter body in contaminated food or water.
b. Hatch in small intestine and bore through the intestinal wall.
c. Enter bloodstream and travel to the lungs.
d. Travel up the air passages to the throat.
e. Person coughs, swallows them, and they travel to the intestines.
f. Develop into adults and reproduce.

87. Name three structural differences between flatworms and roundworms.

88. 1. Flatworms are acoelomates so they have no body cavity and appear flat, roundworms have a coelomate and appear round.
2. Flatworms have one digestive opening, roundworms have two.
3. Flatworms move use cilia, roundworms move my muscle contractions
4. Round worms are covered with a cuticle, flatworms have cilia

89. Name two organs that the squid had that the earthworm did not
Name two organs that the squid had that the earthworm did not. Why does the earthworm not have these structures?

90. Heart, Gonad and Stomach

91. What are the three body parts common to all mollusks?

92. Mantle
Foot
Visceral mass

93. Explain why the skin of a snail and an earthworm is moist

94. It breaths through its skin and it must remain moist for respiration to take place.

95. What features suggest that the squid is adapted to be a predator?

96. Beak and Tenticles