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Coral reefs and Great Barrier Reef

Posted on : 11 Dec 2019

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  • Coral reefs are large underwater structures composed of the skeletons of colonial marine invertebrates called coral.
  • The coral species that build reefs are known as hermatypic, or "hard," corals because they extract calcium carbonate from seawater to create a hard, durable exoskeleton that protects their soft, sac-like bodies. 
  • Hard corals rely on symbiotic algae (zooxanthellae) living within their tissues for nutrition and energy to build their skeleton.
  • Soft corals look like colourful plants or graceful trees and are not reef-building since they do not produce the hard calcified skeleton of many reef-building corals.
  • These types of corals are flexible organisms often resembling plants and trees and include species such as sea fans and sea whips
  • These types of corals are flexible organisms often resembling plants and trees and include species such as sea fans and sea whips.
  • Each individual coral is referred to as a polyp. Coral polyps live on the calcium carbonate exoskeletons of their ancestors, adding their own exoskeleton to the existing coral structure.
  • As the centuries pass, the coral reef gradually grows one tiny exoskeleton at a time, until they become massive features of the marine environment.

Article Related Questions

  1. Consider the following statements about coral reefs
    1.Coral species that build reef and look like colourful plants or graceful trees are called soft corals.
    2.The Great Barrier Reef, located off New Zealand’s East Coast is the largest coral reef in the world.
    Which of the statements given above is/are correct?

  2. 1.1 only

    2.2 only

    3.Both 1 and 2

    4.Neither 1 nor 2

    Right Ans : Neither 1 nor 2

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