Phylum Cnidaria Overview
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Questions and Answers

Which organisms are known as the architects of the ocean floor in the phylum Cnidaria?

  • Horny corals (correct)
  • Sea anemones
  • Jellyfishes
  • Hydroids

    • What is the characteristic cell of the phylum Cnidaria?

  • Nematocysts
  • Chloroplasts
  • Cnidocytes (correct)
  • Flagella

    • Which group of organisms also utilize stinging structures for their own defense, similar to cnidarians?

  • Ctenophores
  • Molluscs
  • Flatworms
  • All of the above (correct)

    • What is the total number of species in the phylum Cnidaria?

    <p>Over 9000 (C)</p> Signup and view all the answers

    What are the two types of corals mentioned in the text?

    <p>horny corals and stony corals</p> Signup and view all the answers

    What is the significance of cnidocytes in the phylum Cnidaria?

    <p>Cnidocytes are characteristic cells that contain stinging organelles (cnidae) unique to the phylum Cnidaria.</p> Signup and view all the answers

    Which organisms eat hydroids bearing nematocysts and use the stinging structures for their own defense?

    <p>Some ctenophores, molluscs, and flatworms</p> Signup and view all the answers

    What are the nature’s strangest and loveliest creatures mentioned in the text?

    <p>Branching, plantlike hydroids; flowerlike sea anemones; jellyfishes</p> Signup and view all the answers

    True or false: Cnidaria includes only jellyfishes and corals, and no other types of creatures

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

    True or false: Cnidocytes are formed by cnidarians, ctenophores, molluscs, and flatworms

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

    True or false: Cnidaria is not named after the characteristic cells called cnidocytes

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

    True or false: The calcareous house-building of stony corals has produced great reefs and coral islands over hundreds of years

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

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