Coral reefs MCQs with Explanations

Correct Answer: (B) Between Tropic of Cancer and Tropic of Capricorn coastal areas

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Most of the world’s coral reefs are found at eastern and western coastal areas between the Tropic of Cancer and Tropic of Capricorn. Australia’s Great Barrier Reef is the world’s largest coral reef. Coral reefs cover less than 0.1% of our Oceans but they contain 25% of the world’s marine species.

Correct Answer: (A) A coral reef near Australia

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The Great Barrier Reef is the world’s largest coral reef. The reef is located in the Pacific Ocean, off the coast of Queensland in North East Australia. Total 2300 km long coral reef lies between 100 south to 240 south. There are over 1,500 species of fish, about 400 species of corals, and approximate 4,000 species of molluscs.

Correct Answer: (B) The Great Barrier Reef

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Stretching for 1,429 miles over an area of approximately 133,000 square miles , the Great Barrier Reef is the largest coral reef system in the world. The reef is located off the coast of Queensland, Australia, in the Coral Sea.

Correct Answer: (B) In shallow trophical seas

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Coral reefs flourish in ocean waters that provide few nutrients. They are most commonly found at shallow depths in tropical waters, but deep water and cold water coral reefs exist on smaller scales in other areas.

Correct Answer: (A) From small living organisms call polyps

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Most structures that we call "coral" are, in fact, made up of hundreds to thousands of tiny coral creatures called polyps. Each soft-bodied polyp—most no thicker than a nickel—secretes a hard outer skeleton of limestone (calcium carbonate) that attaches either to rock or the dead skeletons of other polyps