Understanding Echinoderms
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Questions and Answers

How do sand dollars and sea cucumbers contribute to the seafloor ecosystem?

  • By consuming dead animals
  • By feeding on sea stars
  • By avoiding burrowing
  • By keeping algae growth in check (correct)
  • What is the role of sea urchins in the ecosystem mentioned in the text?

  • Consuming dead animals
  • Oxygenating the seafloor
  • Feeding on sea kelp
  • Controlling algae growth (correct)
  • What negative impact can large populations of echinoderms have on the ecosystem?

  • Reducing sea kelp beds (correct)
  • Boosting biodiversity
  • Increasing algae diversity
  • Promoting coral growth
  • Why have purple sea urchins become overpopulated in the waters of the Pacific Northwest of the United States?

    <p>Loss of natural predators</p> Signup and view all the answers

    How do people help manage the overpopulation of sea urchins?

    <p>By harvesting them for food</p> Signup and view all the answers

    What is the primary diet of crown-of-thorns sea stars?

    <p>Live coral</p> Signup and view all the answers

    Which echinoderm species is known for cleaning the seafloor by consuming dead animals?

    <p>Sea stars</p> Signup and view all the answers

    What ecological role do sand dollars and sea cucumbers play in the seafloor ecosystem?

    <p>Oxygenating the seafloor</p> Signup and view all the answers

    What is primarily responsible for controlling algae growth in the seafloor ecosystem?

    <p>Sand dollars.</p> Signup and view all the answers

    Which echinoderm species is primarily responsible for oxygenating the seafloor?

    <p>Sand dollars and sea cucumbers</p> Signup and view all the answers

    Which echinoderm species is a food source for many other species?

    <p>Brittle stars, sea stars, and sea urchins</p> Signup and view all the answers

    Which echinoderm species helps control algae growth?

    <p>Sea urchins</p> Signup and view all the answers

    Which echinoderm species is known for cleaning the seafloor by consuming dead animals?

    <p>Sea stars</p> Signup and view all the answers

    What has contributed to the overpopulation of purple sea urchins in the Pacific Northwest?

    <p>Loss of natural predators and a warming climate</p> Signup and view all the answers

    How do people help manage the overpopulation of sea urchins?

    <p>By harvesting them for food and as a lime source for farmers</p> Signup and view all the answers

    Which echinoderm species causes severe damage to coral reefs if not controlled?

    <p>Crown-of-thorns sea stars</p> Signup and view all the answers

    What is the primary role of echinoderms in the ecosystem?

    <p>Maintaining ecological balance</p> Signup and view all the answers

    What negative impact can large populations of echinoderms have on the ecosystem?

    <p>Decimating sea kelp beds</p> Signup and view all the answers

    What is the primary diet of crown-of-thorns sea stars?

    <p>Live coral</p> Signup and view all the answers

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