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Name: ________________________ Class: ___________________ Date: __________
Worms and Mullusks Test
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
1. Which is true of both flatworms and roundworms?
a. They are both acoelomates.
c. They both have bilateral symmetry.
b. They are both pseudocoelomates.
d. They both have radial symmetry.
____
2. Which structures are only found in parasitic flatworms?
a. ganglia
c. pharynx
b. eyespot
d. hooks and suckers
____
3. Which organ allows flatworms to excrete waste materials from their bodies?
a. ganglia
c. flame cell
b. pharynx
d. hooks and suckers
____
4. Schistosomiasis is a disease that humans can contract from exposure to which type of flatworm?
a. Trichinella worms
c. trematodes
b. turbellarian
d. cestodes
____
5. When cattle contract a tapeworm, what have they most likely consumed?
a. water infected by trematodes
b. grass that contains proglottid sections
c. soil particles that contain turbellarians
d. raw or undercooked pork
____
6. How do humans usually contract hookworms?
a. eating undercooked pork
c.
b. going barefoot in contaminated soil
d.
eating unwashed vegetables
not washing their hands
____
7. Heartworms are found in many cats and dogs. What type of worm is a heartworm?
a. hookworm
c. pinworm
b. ascarid worm
d. filarial worm
____
8. By which mechanism is trichinosis transmitted?
a. eating contaminated meat
c.
b. swimming in contaminated water
d.
____
drinking contaminated water
receiving a mosquito bite
9. Which characteristic makes rotifers different from roundworms?
a. have bilateral symmetry
c. have rings of cilia around the mouth
b. are pseudocoelomates
d. live in freshwater habitats
____ 10. Which phrase describes the mantle of mollusks?
a. A structure common to all mollusks that functions differently in different classes
b. A structure common to only two of the mollusk classes
c. A structure common to mollusks and other protostomes that functions differently in the
different groups
d. A structure common to all mollusks that functions in the same way throughout the
phylum
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ID: A
Name: ________________________
ID: A
____ 11. Mollusks such as the squid or the octopus move quickly by ejecting water out of which of the following
structures?
a. siphon
c. tentacle
b. nephridium
d. gill
____ 12. The tentacles of a cephalopod are part of which structure?
a. head
c. shell
b. mantle
d. foot
____ 13. How do nudibranchs protect themselves?
a. They have a hard shell.
b. They use jellyfish nematocysts.
c. They adhere to rocks with byssal threads.
d. They eject an inky toxic substance.
____ 14. Which structure secretes the coating that produces a pearl in an oyster?
a. mantle
c. nephridium
b. foot
d. shell
____ 15. Clams, oysters, and scallops are members of which class of mollusk?
a. gastropods
c. cephalopods
b. bivalves
d. nemotodes
____ 16. Which structure physically breaks down food in the earthworm digestive tract?
a. pharynx
c. gizzard
b. crop
d. clitellum
____ 17. Which structure would differentiate an aquatic annelid from a terrestrial annelid?
a. nephridia
c. segmentation
b. setae
d. gills
____ 18. Which character is unique to polychaete annelids?
a. clitellum
c. parapodia
b. cilia
d. setae
____ 19. Which character is shared by oligochaetes and hirudinea but not by polychaetes?
a. clitellum
c. parapodia
b. cilia
d. setae
____ 20. Planarians can reproduce asexually by
a. fission.
b. forming larvae.
c.
d.
producing polyps.
exchanging both sperm and eggs.
____ 21. Flatworms have no need for circulatory and respiratory systems because
a. the digestive system performs these functions.
b. their cells are close to the animal’s exterior surface.
c. the spherical body shape allows diffusion of materials into tissues.
d. the coelom is bathed in blood and oxygen.
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Name: ________________________
____ 22. To which phylum do roundworms belong?
a. Annelida
b. Nematoda
ID: A
c.
d.
____ 23. Roundworms have a fluid-filled cavity called a
a. coelom.
c.
b. pseudocoelom.
d.
Platyhelminthes
Arthropoda
digestive system.
None of the above
____ 24. Roundworms have a digestive tract with ____ opening(s).
a. three
c. one
b. two
d. no
____ 25. All of the following groups of invertebrates are coelomates except
a. annelids.
c. mollusks.
b. echinoderms.
d. nematodes.
____ 26. A roundworm’s digestive tract can be considered an advancement over a gastrovascular cavity because
a. food moves through it in only one direction.
b. different parts of the tract can carry out different functions.
c. undigested wastes do not have to leave through the same opening where food is taken in.
d. All of the above
____ 27. The nematode Ascaris lumbricoides infects humans, spending most of its adult life inside the intestines of its
host. To be infected, a person must
a. consume the nematode’s eggs.
b. walk barefoot on infested soil.
c. sit on an infested toilet seat.
d. All of the above
____ 28. Humans can avoid trichinosis by
a. avoiding undercooked meat.
b. avoiding public restrooms.
c. wearing shoes outdoors.
d. washing their hands frequently.
____ 29. Which of the following is not true about the planarian nervous system?
a. It includes a ladderlike arrangement of nerves.
b. It provides the ability to sense light intensity.
c. It includes one ventral nerve cord.
d. It provides the ability to learn.
____ 30. Which of the following has a true coelom?
a. flatworm
b. roundworm
c.
d.
rotifer
mollusk
____ 31. The evolution of a coelom was significant because
a. more food could be stored within it.
b. more wastes could be stored before excretion.
c. it enabled development of more complex organ systems.
d. it eliminated the need for a circulatory system.
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Name: ________________________
ID: A
____ 32. A characteristic structure found in many mollusks is the radula, which is involved in
a. jet propulsion.
c. eating.
b. opening and closing of the shell.
d. reproduction.
____ 33. Which of the following is a correct pairing?
a. phylum Platyhelminthes—hydra
b. phylum Nematoda—planaria
c. phylum Mollusca—octopus
d. phylum Annelida—roundworm
____ 34. All of the following are classes of the phylum Mollusca except
a. bivalves.
c. gastropods.
b. cephalopods.
d. pseudopods.
____ 35. Which of the following mollusks have a closed circulatory system?
a. snails
c. slugs
b. cephalopods
d. gastropods
____ 36.
Refer to the illustration above. Which two organisms have mantles?
a. 1 and 3
c. 1 and 4
b. 2 and 3
d. 2 and 4
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Name: ________________________
ID: A
____ 37. Refer to the illustration above. This organism is a
a. bivalve.
c.
b. cephalopod.
d.
trochophore.
gastropod.
____ 38. Refer to the illustration above. Movement of this organism is dependent upon structure
a. 1.
c. 3.
b. 2.
d. None of the above
____ 39. Shells of mollusks
a. may consist of one or more pieces.
b. provide protection.
c. allow for the attachment of muscles.
d. All of the above
____ 40. Adductor muscles are responsible for
a. moving the valves of bivalves.
b. extending the feet of mollusks.
c. pumping the hearts of mollusks.
d. fanning the gills of aquatic mollusks.
____ 41. In an open circulatory system,
a. water is drawn into the mantle cavity to provide oxygen to body tissues.
b. lungs branch into small tubules to provide oxygen to tissues.
c. wastes are eliminated directly to the environment from the tissues.
d. blood is released directly into spaces in the body tissues.
____ 42. Twisting of the visceral mass of gastropods is called
a. extension.
c. torsion.
b. inversion.
d. conversion.
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Name: ________________________
ID: A
____ 43. All of the cephalopods
a. have eight tentacles.
b. are predators.
c. possess protective shells.
d. are filter feeders.
____ 44. Jet propulsion in a squid is the result of
a. rapid closing of the organism’s shell.
b. strong contractions of the tentacles.
c. high-pressure discharge of fluid from the organism’s mouth.
d. the pumping of water through the siphon.
____ 45. The only cephalopod that has retained its external shell is the
a. cuttlefish.
c. octopus.
b. chambered nautilus.
d. squid.
____ 46. Segmented worms are known as
a. nematodes.
b. annelids.
c.
d.
planarians.
arthropods.
____ 47. Each segment of an annelid
a. is capable of reproduction.
b. has a well-developed brain that allows the annelid to learn simple tasks.
c. has a pseudocoelom.
d. may contain some organ systems that duplicate systems in other segments.
____ 48. An example of segmentation in humans is the
a. digestive system.
c.
b. skin.
d.
vertebral column.
brain.
____ 49. The most significant evolutionary advancement of annelids over mollusks is believed to be
a. the ability to burrow.
c. segmentation.
b. the existence of a true coelom.
d. cephalization.
____ 50. Small tubules that collect wastes from the coelom of annelids and discharge the wastes from the body are
called
a. nephridia.
c. bivalves.
b. radulae.
d. spicules.
____ 51. The digestive tube of the earthworm is divided into three regions. Which of the following is not among these
regions?
a. crop
c. radula
b. intestine
d. gizzard
____ 52. The advantage of a closed circulatory system over an open circulatory system is that
a. blood moves more efficiently through the tubes of a closed circulatory system.
b. a closed circulatory system prevents blood from leaking out of the body.
c. blood is able to be pumped by a muscular heart in a closed circulatory system.
d. lungs are able to function in animals with a closed circulatory system.
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Name: ________________________
ID: A
____ 53. The clitellum of an earthworm
a. contains the heart.
b. is associated with reproduction.
c. acts as a primitive respiratory system.
d. is necessary for movement.
____ 54. Leeches
a. use suckers to aid in movement.
b. may be parasitic.
c.
d.
are segmented.
All of the above
Completion
Complete each statement.
1. Flatworms are ____________________ because they produce both eggs and sperm.
2. Roundworms have ____________________ symmetry.
3. Herbivorous mollusks use ____________________ to scrape algae off rocks.
4. Most annelids have a(n) ____________________ circulatory system.
5. Some marine polychaetes have parapodia modified to act as ____________________, like the respiratory
organs in fish.
6.
Refer to the illustration above. Structure X is the ventral ____________________ cord.
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