Structure of Coral Reefs
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Questions and Answers

What are some threats faced by coral reefs mentioned in the text?

  • Higher levels of freshwater in the ocean
  • Decreased sedimentation
  • Increased levels of oxygen in seawater
  • Exposure to ultraviolet radiation and pollution (correct)

    • How do tourists sometimes negatively impact coral reefs?

  • By planting more corals
  • By participating in reef cleanup activities
  • By respecting marine life and habitat
  • By touching corals and disturbing other animals (correct)

    • What is a consequence of overharvesting fish in coral reefs?

  • Growth of fish population
  • Decrease in sedimentation levels
  • Break up of reef sections and destruction of corals (correct)
  • Increase in coral population

    • How do fishers sometimes catch reef animals, causing harm to the reefs?

    <p>Using dragnets and explosives</p> Signup and view all the answers

    What efforts are mentioned in the text to protect coral reefs?

    <p>Government programs and conservation groups working together</p> Signup and view all the answers

    What binds and cements shelly and calcareous organisms together on coral reefs?

    <p>Algae and protozoans</p> Signup and view all the answers

    What type of coral reef is formed when the reef is separated from the land by a shallow lagoon?

    <p>Barrier reef</p> Signup and view all the answers

    Which feature distinguishes a fringing reef from other types of coral reefs?

    <p>Directly attached to the land</p> Signup and view all the answers

    In what ocean can the largest island of coral formation, Kiritimati Atoll, be found?

    <p>Pacific Ocean</p> Signup and view all the answers

    What type of marine plants help trap and stabilize sediment on coral reefs?

    <p>Sea grasses and mangroves</p> Signup and view all the answers

    What characteristic do all types of coral islands share?

    <p>Low land above sea level</p> Signup and view all the answers

    What are corals?

    <p>Small marine animals</p> Signup and view all the answers

    How do corals build the main structural framework of a growing reef?

    <p>By secreting calcium carbonate to form their skeletons</p> Signup and view all the answers

    Why are coral reefs compared to rainforests?

    <p>Because they provide habitats for diverse species</p> Signup and view all the answers

    What role do coral reefs play in the economy of a region?

    <p>They provide food for millions of people</p> Signup and view all the answers

    Why are coral reefs important for marine organisms?

    <p>To create underwater habitats</p> Signup and view all the answers

    What do certain species of fish use coral reefs for?

    <p>As a refuge from predators</p> Signup and view all the answers

    What is the main function of coral reefs mentioned in the text?

    <p>Acting as barriers against storm and wave erosion</p> Signup and view all the answers

    Where are the largest coral reefs primarily found?

    <p>Pacific and Indian Oceans</p> Signup and view all the answers

    Why do reef-building corals need to live in relatively shallow ocean waters?

    <p>To allow light penetration for photosynthesis</p> Signup and view all the answers

    What is the role of zooxanthellae in coral reefs?

    <p>Converting carbon dioxide into oxygen through photosynthesis</p> Signup and view all the answers

    At what depth do reef-building corals grow best?

    <p>66 feet (20 meters)</p> Signup and view all the answers

    Why do certain corals in colder climates not form reefs?

    <p>Because they are solitary forms that do not require reefs</p> Signup and view all the answers

    What is the distinguishing feature of fringing reefs compared to barrier reefs and atolls?

    <p>They extend up to the beach at some points</p> Signup and view all the answers

    Which organism is known to decimate coral reefs by feeding on their soft tissues?

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

    What environmental event can cause corals to eject the zooxanthellae algae and turn white?

    <p>Global warming</p> Signup and view all the answers

    What is the major issue associated with coral-rock borers mentioned in the text?

    <p>They cause extensive damage by penetrating the rock</p> Signup and view all the answers

    Which type of reef has no visible relationship to any land?

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

    What is one possible consequence if the zooxanthellae algae do not return to the corals after bleaching?

    <p>The corals will die</p> Signup and view all the answers

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