| True/False Indicate whether the sentence or statement is true or false. |
| 1. | Planarians have a branched digestive tract with both a mouth and an anus. |
| 2. | Most flatworms are not parasitic. |
| 3. | Tapeworms absorb food from their host’s intestine directly through their skin. |
| 4. | Humans can avoid trichinosis by wearing shoes when they walk through fields. |
| 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. |
| Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. |
| 6. | Flatworms can reproduce asexually by a. | fission. | c. | producing polyps. | b. | forming larvae. | d. | exchanging both sperm and eggs. | | | | |
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| 7. | Which of the following is not found in flatworms? a. | a head | c. | bilateral symmetry | b. | a circulatory system | d. | a nervous system | | | | |
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| 8. | 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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| 9. | Schistosomiasis is a disease caused by a a. | roundworm. | c. | cestode. | b. | trematode. | d. | planarian. | | | | |
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| 10. | turbellarians : free living :: a. | planaria : parasitic | c. | cestodes : free living | b. | tapeworms : free living | d. | flukes : parasitic | | | | |
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| 11. | Which of the following statements about tapeworms is false? a. | They can infect a person who eats improperly cooked beef. | b. | They belong to the genus Schistosoma. | c. | They can grow to be large in human intestines. | d. | These flatworms do not have a digestive system. | | |
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| 12. | To which phylum do roundworms belong? a. | Annelida | c. | Platyhelminthes | b. | Nematoda | d. | Arthropoda | | | | |
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| 13. | Roundworms have a fluid-filled cavity between the gut and body wall called a a. | coelom. | c. | digestive system. | b. | pseudocoelom. | d. | None of the above | | | | |
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| 14. | Pseudocoelomates a. | must move rapidly to enhance diffusion of nutrients. | b. | must be very small or have body shapes with short distances between organs and the body surface. | c. | must have a circulatory system. | d. | All of the above | | |
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| 15. | The first organisms to develop an internal body cavity were the a. | flatworms. | c. | mollusks. | b. | nematodes. | d. | arthropods. | | | | |
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| 16. | All of the following groups of invertebrates are coelomates, except a. | annelids. | c. | mollusks. | b. | echinoderms. | d. | nematodes. | | | | |
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| 17. | The evolution of body cavities was important because a. | fluids within the body cavity aid in circulation of materials from one part of the body to another. | b. | fluids in the cavity make the body rigid and offer resistance to muscles, aiding in movement. | c. | organs are better able to function if they can move freely within the body cavity. | d. | 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 a. | consume the nematode’s eggs. | c. | sit on an infested toilet seat. | b. | walk barefoot on infested soil. | d. | All of the above | | | | |
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| 19. | A type of roundworm that lives a parasitic life is a. | Ascaris. | c. | Trichinella. | b. | Necator. | d. | All of the above | | | | |
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| 20. | Rotifers eliminate excess water that they collect from their freshwater environment by a. | diffusion. | c. | flame cells and excretory tubules. | b. | kidneys. | d. | a mastax. | | | | |
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