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True/False
Indicate whether the sentence or statement is true or false.
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1. |
Planarians have a branched digestive tract with both a mouth and an anus.
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2. |
Most flatworms are not parasitic.
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3. |
Tapeworms absorb food from their host’s intestine directly through their skin.
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4. |
Humans can avoid trichinosis by wearing shoes when they walk through fields.
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5. |
Rotifers have a distinct head end with a mouth and a distinct tail end that has an opening through which substances from the digestive, reproductive, and excretory systems exit the body.
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Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
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6. |
Flatworms can reproduce asexually by
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a.
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fission.
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c.
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producing polyps.
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b.
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forming larvae.
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d.
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exchanging both sperm and eggs.
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7. |
Which of the following is not found in flatworms?
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a.
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a head
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c.
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bilateral symmetry
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b.
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a circulatory system
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d.
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a nervous system
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8. |
Flatworms have no need for circulatory and respiratory systems because
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a.
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the digestive system performs these functions.
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b.
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their cells are close to the animal’s exterior surface.
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c.
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the spherical body shape allows diffusion of materials into tissues.
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d.
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the coelom is bathed in blood and oxygen.
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9. |
Schistosomiasis is a disease caused by a
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a.
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roundworm.
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c.
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cestode.
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b.
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trematode.
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d.
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planarian.
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10. |
turbellarians : free living ::
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a.
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planaria : parasitic
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c.
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cestodes : free living
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b.
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tapeworms : free living
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d.
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flukes : parasitic
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11. |
Which of the following statements about tapeworms is false?
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a.
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They can infect a person who eats improperly cooked beef.
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b.
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They belong to the genus Schistosoma.
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c.
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They can grow to be large in human intestines.
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d.
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These flatworms do not have a digestive system.
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12. |
To which phylum do roundworms belong?
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a.
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Annelida
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c.
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Platyhelminthes
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b.
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Nematoda
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d.
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Arthropoda
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13. |
Roundworms have a fluid-filled cavity between the gut and body wall called a
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a.
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coelom.
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c.
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digestive system.
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b.
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pseudocoelom.
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d.
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None of the above
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14. |
Pseudocoelomates
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a.
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must move rapidly to enhance diffusion of nutrients.
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b.
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must be very small or have body shapes with short distances between organs and the body surface.
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c.
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must have a circulatory system.
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d.
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All of the above
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15. |
The first organisms to develop an internal body cavity were the
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a.
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flatworms.
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c.
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mollusks.
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b.
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nematodes.
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d.
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arthropods.
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16. |
All of the following groups of invertebrates are coelomates, except
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a.
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annelids.
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c.
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mollusks.
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b.
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echinoderms.
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d.
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nematodes.
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17. |
The evolution of body cavities was important because
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a.
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fluids within the body cavity aid in circulation of materials from one part of the body to another.
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b.
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fluids in the cavity make the body rigid and offer resistance to muscles, aiding in movement.
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c.
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organs are better able to function if they can move freely within the body cavity.
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d.
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All of the above
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18. |
The nematode Ascaris lumbricoides infects humans, spending most of its adult life inside the intestines of its host. To be infected, a person must
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a.
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consume the nematode’s eggs.
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c.
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sit on an infested toilet seat.
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b.
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walk barefoot on infested soil.
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d.
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All of the above
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19. |
A type of roundworm that lives a parasitic life is
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a.
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Ascaris.
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c.
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Trichinella.
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b.
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Necator.
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d.
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All of the above
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20. |
Rotifers eliminate excess water that they collect from their freshwater environment by
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a.
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diffusion.
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c.
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flame cells and excretory tubules.
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b.
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kidneys.
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d.
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a mastax.
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