Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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Planarians can reproduce asexually by
a. | fission. | c. | producing polyps. | b. | forming larvae. | d. | exchanging both sperm and
eggs. |
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2.
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Which of the following is not found in flatworms?
a. | an anterior end | c. | bilateral symmetry | b. | a circulatory system | d. | a nervous
system |
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3.
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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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4.
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Schistosomiasis is a disease caused by a
a. | roundworm. | c. | cestode. | b. | trematode. | d. | planarian. |
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5.
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turbellarians : free-living ::
a. | planaria : parasitic | c. | cestodes : free-living | b. | tapeworms :
free-living | d. | flukes :
parasitic |
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6.
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Which of the following statements about tapeworms is false?
a. | They can infect a person who eats undercooked food. | b. | They belong to the
genus Schistosoma. | c. | They can grow to be large in human
intestines. | d. | They do not have a digestive system. |
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7.
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To which phylum do roundworms belong?
a. | Annelida | c. | Platyhelminthes | b. | Nematoda | d. | Arthropoda |
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8.
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Roundworms have a fluid-filled cavity called a
a. | coelom. | c. | digestive system. | b. | pseudocoelom. | d. | None of the
above |
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9.
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Roundworms have a digestive tract with ____ opening(s).
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10.
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All of the following groups of invertebrates are coelomates except
a. | annelids. | c. | mollusks. | b. | echinoderms. | d. | nematodes. |
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11.
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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 |
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12.
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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 |
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13.
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A type of roundworm that lives a parasitic life is
a. | Ascaris. | c. | Trichinella. | b. | Enterobius. | d. | All of the
above |
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14.
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A rotifer uses ____ to collect excess water in order to remove the water from
the body.
a. | diffusion | b. | kidneys | c. | flame cells and
excretory tubules | d. | a mastax |
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15.
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Which of the following statements is not true?
a. | Most tapeworms are hermaphrodites. | b. | Planarians reproduce both sexually and
asexually. | c. | Some rotifers reproduce by parthenogenesis. | d. | Because they are all
parasitic, roundworms reproduce asexually. |
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16.
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Tapeworms absorb food from the host through their
a. | scolex. | c. | suckers. | b. | tegument. | d. | None of the
above |
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17.
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Humans can avoid trichinosis by
a. | avoiding undercooked meat. | b. | avoiding public restrooms. | c. | wearing shoes
outdoors. | d. | washing their hands frequently. |
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18.
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Which of the following has a cloaca?
a. | a fluke | c. | a rotifer | b. | a nematode | d. | a tapeworm |
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19.
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Parasitic flatworms
a. | probably evolved from free-living organisms. | b. | gave rise to
free-living flatworms. | c. | have a gut with two
openings. | d. | are found mostly in the class Turbellaria. |
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20.
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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. |
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Completion
Complete each
statement.
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21.
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A schistosome is a member of the phylum ____________________.
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22.
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The ability of some animals, such as flatworms, to regrow lost parts of their
bodies is called ____________________.
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23.
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Flatworms take up oxygen and release carbon dioxide by the process of
____________________, which occurs across the body surface of the animals.
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24.
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The ____________________ is a protective cellular covering of the bodies of
endoparasitic flukes that prevents them from being digested by their hosts.
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25.
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____________________ are rectangular body sections of tapeworms.
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26.
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Roundworms are members of the phylum ____________________.
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27.
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Roundworms take in food through the mouth and eliminate wastes through an
opening at the other end of the digestive tract called the ____________________.
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28.
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Organisms that feed by using cilia to sweep food into their mouths are called
____________________.
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29.
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____________________ are the simplest animals with bilateral symmetry.
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30.
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Concentration of sense organs at the anterior end can be observed in flatworms
and is called ____________________.
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31.
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A planarian takes in food through the ____________________.
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32.
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The ____________________ is a noncellular layer that protects a
roundworm.
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33.
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Being infected with ____________________ worms can cause a condition known as
elephantiasis.
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Essay
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34.
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A planarian cannot eat when food is already in its gut. Why? Write your answer
in the space below.
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