University:
Davenport University
Course:
BIOL 100 | Introduction to Biology
Academic year:

2020
Views:

318

Pages:

8
Author:

Caroline Mcfarland

Chapter 27 Worms and Mollusks Section Review 27-1 Reviewing Key Concepts Completion On the lines provided, complete the following sentences. Tissues and internal organ systems are characteristics of all flatworms. Flatworms are the simplest animals to have three embryonic germ layers. Flatworms exhibit bilateral symmetry. Most flatworms exhibit enough cephalization to have what is called a head. Completion On the lines provided, complete the following sentences with the appropriate group of flatworms. Turbellarians are free-living marine or freshwater flatworms. Flukes are parasitic flatworms that usually infect the internal organs of their host. Tapeworms are long, flat, parasitic worms that are adapted to life inside the intestines of their hosts. Reviewing Key Skills Applying Concepts How does the shape of its body allow a flatworm to rely on diffusion for its respiration and excretion?1 The thin shape of a flatworm's body places most cells close to the external environment. Therefore, materials can diffuse easily between the worm's body and the external environment. Inferring How does going barefoot affect a person's chance of becoming infected with Schistosoma? Explain. If people go barefoot, the skin on the lower parts of their feet is exposed, making it more likely that Schistosoma larvae will be able to penetrate the skin. Applying Concepts Explain the process by which a human could become infected with tapeworms. Chapter 27 Worms and Mollusks Section Review 27-2 **Reviewing Key Concepts** Completion On the lines provided, complete the following sentences. 1. Roundworms are unsegmented worms. 2. The body cavity of a roundworm is described as a pseudocoelom. 3. The mouth is the opening of the roundworm's digestive system. 4. The anus is the posterior opening of the digestive tract of roundworms. Matching On the lines provided, write the letter of the definition that best matches each term on the right. 5. trichinosis-causing worms c. complete their life cycle only when another animal eats muscle tissue containing their cysts 6. filarial worms b. are transmitted from host to host through biting insects, especially mosquitoes 7. ascarid worms d. cause malnutrition and are spread by eating foods that are not washed properly 8. hookworms a. use sharp teethlike structures to enter the unprotected feet of a host **Reviewing Key Skills** 9. Applying Concepts How can the life cycle, and therefore the transmission, of Trichinella be most easily interrupted? Explain your answer. The best way to interrupt the life cycle and stop the transmission of Trichinella is to avoid contaminated meat and cook all meat thoroughly. Interpreting Graphics Observe the illustration. Fill in the missing words to describe each of the six steps in the sequence of events in an Ascaris infection of a human being. 10. Human ingests food or water containing Ascaris eggs. 11. The eggs travel to the small intestine and develop into larvae. 12. Larvae enter blood vessels and are carried to the lungs. 13. The larvae are coughed up and swallowed. 14. Larvae develop to maturity in the small intestine. 15. Eggs are released and leave the host in feces.

Worms and Mollusks Answer Key

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