BIO 116 Lab 3: Phylum Platyhelminthes Characteristics
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Questions and Answers

What is the main advantage of the dorsoventrally flattened body plan of flatworms?

  • Reduces the surface area to volume ratio
  • Maximizes the surface area to volume ratio for efficient gas exchange (correct)
  • Provides them with a body cavity for internal organ development
  • Allows them to stay in relatively dry and hot environments

    • What type of symmetry do flatworms exhibit?

  • Spherical symmetry
  • Asymmetry
  • Bilateral symmetry (correct)
  • Radial symmetry

    • Which of the following is not a characteristic of the digestive system in flatworms?

  • Allows for the entry and exit of food and undigested waste
  • Incomplete, sac-like structure with a single opening
  • Gas exchange occurs via diffusion across the body surface
  • Consists of a true coelom (body cavity) for organ development (correct)

    • What is the function of the protonephridia (flame cells) in the excretory system of flatworms?

    <p>Excrete waste products from the organism's body (B)</p> Signup and view all the answers

    Which of the following is not a common mode of locomotion in flatworms?

    <p>Bipedal walking (C)</p> Signup and view all the answers

    What is the main function of the rhabdites in the epidermis of flatworms?

    <p>Secrete mucus for locomotion and defense (C)</p> Signup and view all the answers

    Which of the following is a characteristic of the nervous system in flatworms?

    <p>Exhibits cephalization with a concentration of sensory organs and nervous control in one end (B)</p> Signup and view all the answers

    Which of the following is not a feature of the parenchyma in flatworms?

    <p>Provides a true coelom (body cavity) for organ development (A)</p> Signup and view all the answers

    What is the primary mode of reproduction in most free-living flatworms (class Turbellaria)?

    <p>Hermaphroditic, with each individual producing both male and female gametes (B)</p> Signup and view all the answers

    What is the function of the pharynx in the digestive system of flatworms?

    <p>Serves as the primary site of extracellular digestion (B)</p> Signup and view all the answers

    Which of the following is a structure that aids in attachment for the class Monogenea?

    <p>Haptor (B)</p> Signup and view all the answers

    Which of the following statements about the class Cestoda is correct?

    <p>They obtain nutrients via diffusion. (A)</p> Signup and view all the answers

    What is the function of the scolex in the class Cestoda?

    <p>It attaches the tapeworm to the intestinal mucosa of the host. (C)</p> Signup and view all the answers

    Which of the following statements about the life cycle of the class Trematoda is correct?

    <p>They have an indirect life cycle and require two hosts. (C)</p> Signup and view all the answers

    What is the function of the oral sucker and acetabulum in the class Trematoda?

    <p>They prevent dislodgement and aid in feeding. (A)</p> Signup and view all the answers

    Which of the following is a structure found in the class Monogenea that aids in attachment to the host?

    <p>Prohaptor (A)</p> Signup and view all the answers

    What is the function of the tegument in the class Trematoda?

    <p>It protects against host digestive enzymes and facilitates gas exchange. (A)</p> Signup and view all the answers

    Which of the following statements about the reproductive strategy of the class Trematoda is correct?

    <p>Copulation and cross-fertilization are common. (D)</p> Signup and view all the answers

    What is the function of the protonephridia in the class Trematoda?

    <p>It excretes water and waste metabolites. (D)</p> Signup and view all the answers

    Which of the following statements about the life cycle of the class Trematoda is correct?

    <p>The miracidium larva is the only free-swimming larval stage. (B)</p> Signup and view all the answers

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