Classes of Cnidaria: Hydrozoa
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Questions and Answers

What is the main characteristic of the Coelenteron in the Class Hydrozoa?

  • It has a complex stomodeum (gullet)
  • It is filled with specialized cells
  • It is divided into multiple chambers
  • It serves as both a digestive chamber and a hydrostatic skeleton (correct)
  • What is the primary function of the cnidocytes (stinging cells) found in the tentacles of Hydrozoa?

  • For filtering food particles
  • For locomotion
  • For capturing prey and defense (correct)
  • For reproduction
  • Which of the following is a characteristic of the medusa form in the Class Hydrozoa?

  • It has a complex stomodeum (gullet)
  • It is conspicuous and free-swimming
  • It is the dominant life stage (correct)
  • It has a divided coelenteron
  • How do Hydrozoa typically reproduce sexually?

    <p>Through separate sexes with external fertilization</p> Signup and view all the answers

    What type of environment do Hydrozoa commonly inhabit?

    <p>Shallow saltwater habitats, including coastal areas, estuaries, and coral reefs</p> Signup and view all the answers

    What is the primary food source for Hydrozoa?

    <p>Minute crustaceans, insect larvae, zooplankton, and other small organisms</p> Signup and view all the answers

    What is the distinguishing feature of the medusa form of some jellyfish discussed in the text?

    <p>Flattened bell lacking typical swimming capability</p> Signup and view all the answers

    What is the role of zooxanthellae in the symbiotic relationship with certain jellyfish?

    <p>Provide energy through photosynthesis</p> Signup and view all the answers

    In the class Anthozoa, what is the function of cnidocytes on the hollow tentacles surrounding the central mouth?

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

    What aids in directing food particles into the gastrovascular cavity for digestion in Anthozoa?

    <p>Stomodeum leading from the mouth</p> Signup and view all the answers

    How do polyps typically reproduce in Anthozoa?

    <p>Release gametes externally for fertilization</p> Signup and view all the answers

    What is a characteristic of planula larvae in the life cycle of Anthozoa?

    <p>Settling onto a substrate after formation</p> Signup and view all the answers

    What is a distinguishing feature of Physalia, a member of Class Hydrozoa?

    <p>Gas-filled float and cluster of polyps</p> Signup and view all the answers

    Which structure in Physalia helps it achieve buoyancy in the water?

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

    What is the role of Dactylozoids in Class Hydrozoa?

    <p>Long tentacles with venomous cnidocytes</p> Signup and view all the answers

    How do Physalia colonies reproduce?

    <p>Through the production of gametes by Gonozoids</p> Signup and view all the answers

    What is the primary function of Gonozoids in Class Hydrozoa?

    <p>Producing gametes</p> Signup and view all the answers

    Which feature distinguishes Class Scyphozoa from Class Hydrozoa based on the text?

    <p>Free-swimming medusa dominant life cycle</p> Signup and view all the answers

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