Cnidarian Body Plan in Biology 108 Winter 2024
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Questions and Answers

What is the central cavity of the cnidarian body plan?

  • Digestive compartment
  • Ectoderm
  • Gastrovascular cavity (correct)
  • Mesoglea

    • What is the function of cnidocytes in cnidarians?

  • Gas exchange
  • Prey capture and defence (correct)
  • Movement
  • Digestion

    • What is the name of the gelatinous matrix that separates the epidermis and gastrodermis?

  • Mesoglea (correct)
  • Mesoderm
  • Ectoderm
  • Gastrodermis

    • What is the main difference between the polyp and medusa forms of cnidarians?

    <p>Mode of movement</p> Signup and view all the answers

    What is the function of the tentacles in cnidarians?

    <p>Capture and defence</p> Signup and view all the answers

    How do cnidarians exchange gases?

    <p>Via diffusion across the epidermis</p> Signup and view all the answers

    What type of symmetry is exhibited by most basal Eumetazoans?

    <p>Radial symmetry</p> Signup and view all the answers

    What tissues are present in most basal Eumetazoans?

    <p>Muscle and nerve tissues</p> Signup and view all the answers

    Which phylum includes jellyfish, sea anemones, and corals?

    <p>Cnidaria</p> Signup and view all the answers

    What limits the distribution of soft sponges with spongin to the photic zone?

    <p>Toxic chemicals</p> Signup and view all the answers

    What distinguishes medusozoan cnidarians from anthozoan cnidarians?

    <p>Sessile lifestyle in medusozoans</p> Signup and view all the answers

    Why are most sponges unpalatable to predators?

    <p>Production of toxic chemicals</p> Signup and view all the answers

    Which cell type in sponges generates water currents by beating their flagella and captures suspended food particles?

    <p>Choanocytes</p> Signup and view all the answers

    What is the structural support provided by the tiny needles or rods of silica or calcium carbonate in sponges?

    <p>Spicules</p> Signup and view all the answers

    What characterizes Phylum Porifera in terms of true tissues and specialized cell types?

    <p>They lack true tissues but possess a wide range of specialized cell types</p> Signup and view all the answers

    Which Phylum is informally known as 'sponges'?

    <p>Porifera</p> Signup and view all the answers

    What is the function of porocytes in sponges?

    <p>Allow water to flow through the sponge</p> Signup and view all the answers

    Which material provides structural support in a bath sponge?

    <p>Spongin</p> Signup and view all the answers

    What is a distinguishing characteristic of most basal Eumetazoans?

    <p>Radial symmetry and diploblastic body plan</p> Signup and view all the answers

    Among the following, which is a defining feature of Phylum Cnidaria?

    <p>Radially symmetrical, diploblastic body plan</p> Signup and view all the answers

    What differentiates medusozoan cnidarians from anthozoan cnidarians?

    <p>Mobility</p> Signup and view all the answers

    What feature is shared by most sponges that makes them unattractive to predators?

    <p>Production of toxic chemicals</p> Signup and view all the answers

    Which body plan characteristic limits the distribution of soft sponges to the photic zone?

    <p>Radial symmetry</p> Signup and view all the answers

    What is the distinguishing feature of Eumetazoa compared to sponges?

    <p>Possession of true tissues</p> Signup and view all the answers

    How are the epidermis and gastrodermis separated in the body plan of cnidarians?

    <p>By the mesoglea, a gelatinous matrix</p> Signup and view all the answers

    What is the main function of the tentacles equipped with cnidocytes in cnidarians?

    <p>Prey capture and defence</p> Signup and view all the answers

    Which variation of the cnidarian body plan attaches to a substrate with its oral end upwards?

    <p>Polyp</p> Signup and view all the answers

    What allows the bell-shaped medusa form of cnidarians to move freely through the water?

    <p>A hydrostatic skeleton</p> Signup and view all the answers

    In cnidarians, what type of cells surround the single opening to the gastrovascular cavity?

    <p>Cnidocytes</p> Signup and view all the answers

    What is the role of the mesoglea in the cnidarian body plan?

    <p>Separation of tissues</p> Signup and view all the answers

    What is unique about the larvae of Phylum Porifera?

    <p>They are motile</p> Signup and view all the answers

    What is the primary function of choanocytes in sponges?

    <p>To capture suspended food particles</p> Signup and view all the answers

    Which of the following is NOT a characteristic of Phylum Porifera?

    <p>Presence of a nervous system</p> Signup and view all the answers

    What is the primary function of porocytes in sponges?

    <p>To allow water to flow through the sponge</p> Signup and view all the answers

    What is the main difference between medusozoan and anthozoan cnidarians?

    <p>Their body structure</p> Signup and view all the answers

    What is the function of the central cavity in cnidarians?

    <p>To exchange gases</p> Signup and view all the answers

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