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Coral Reefs

18 MCQ questions with answers and explanations

Test yourself▶ Full test · 18 questions

Q1. What are corals?

  1. Aa forest timber
  2. Ba sea creature
  3. Ca herb
  4. Da terrestrial creature
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Answer: B) a sea creature

Q2. Coral reef is-

  1. Aa group formed by organisms
  2. Breefs built by marine organisms
  3. Ca trough near Australia
  4. Da grass found on the east coast of Australia
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Answer: B) reefs built by marine organisms

Q3. The most important condition for the deposition of coral is-

  1. ADeep ocean, sedimentary water, low temperature
  2. BShallow sea, sediment-laden water, moderate temperature
  3. CShallow sea, sediment-laden water, high temperature
  4. DDeep ocean, sedimentary water, moderate temperature
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Answer: B) Shallow sea, sediment-laden water, moderate temperature

Q4. Which ocean is suitable for the formation of coral reefs?

  1. Atropical ocean
  2. Bcold tropical ocean
  3. Ctemperate tropical ocean
  4. Dnone of these
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Answer: A) tropical ocean

Q5. Which temperature is suitable for the growth of coral organisms?

  1. A70 ⁰Fto 80⁰F
  2. B65⁰F to 70⁰F
  3. C50⁰F to 60⁰F
  4. D60⁰F to 80⁰F
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Answer: B) 65⁰F to 70⁰F

Q6. For the growth of corals, the average sea salinity should be-

  1. A22% to 27%
  2. B27% to 32%
  3. C32% to 37%
  4. D37% to 42%
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Answer: B) 27% to 32%

Q7. Coral reefs are mainly found in-

  1. A30 ⁰ Nbetween 10°S and 30°S latitude
  2. BBetween 20°N to 20°S latitude
  3. CBetween 15⁰ N to 30⁰ N and 15⁰ S to 30⁰ S latitude
  4. DBetween 20⁰N to 35⁰N and 20⁰S to 35⁰S latitude
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Answer: A) 30 ⁰ Nbetween 10°S and 30°S latitude

Q8. The coral reef which is formed at some distance from the sea shore is called-

  1. Aring coral reef
  2. Bbarrier reef
  3. Ccoastal coral reef
  4. Dnone of these
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Answer: B) barrier reef

Q9. Which coral reef is shaped like a horseshoe or a ring?

  1. Acoastal coral reef
  2. Bbarrier reef
  3. CAtoll
  4. Dall of which
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Answer: C) Atoll

Q10. What is the lagoon that develops between a coastal coral reef and a landmass called?

  1. AAtoll
  2. BKayal
  3. Ccaravans
  4. DBoat Channel
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Answer: D) Boat Channel

Q11. Who propounded the subsidence theory related to the origin of coral reefs?

  1. AGardiner
  2. BDarwin
  3. CMurray
  4. DDaily
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Answer: B) Darwin

Q12. Who propounded the glacial control theory related to the origin of coral reefs?

  1. ADana
  2. BDavis
  3. CDaily
  4. DJolly
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Answer: C) Daily

Q13. Where is the world's largest barrier reef system located?

  1. ASouth Australian coast
  2. BWestern Australian coast
  3. CNorth Australian coast
  4. DEast Australian coast
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Answer: D) East Australian coast

Q14. What is the length and width of the Great Barrier Reef respectively?

  1. A600 Km and 200 Km
  2. B1000 Km and 300 Km
  3. C1200 Km and 100 Km
  4. D1900 Km and 160 Km
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Answer: D) 1900 Km and 160 Km

Q15. The Great Barrier Reef located on the east coast of Australia is an example of which of the following coral reefs?

  1. Acoastal coral reef
  2. Bbarrier reef
  3. Ccoastal coral reef
  4. Dnone of these
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Answer: B) barrier reef

Q16. The world's largest coral reef is found near the coast of which one of the following countries?

  1. AAustralia
  2. BCuba
  3. CGhana
  4. Dphilippines
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Answer: A) Australia

Q17. Where are coral reefs or fossil belts usually found?

  1. AAbove 18°C in temperate climate zones
  2. BIn the coastal areas between the Tropic of Cancer and the Tropic of Capricorn
  3. Con the eastern and western coasts of continents and islands
  4. Don the cold seashores
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Answer: C) on the eastern and western coasts of continents and islands

Q18. Which one of the following statements regarding the growth of coral reefs is not correct?

  1. ACorals can grow abundantly in freshwater
  2. BIt is 23⁰Requires warm water between 25°C - 25°C
  3. CThis requires shallow saline water, no deeper than 50 metres.
  4. DIt requires abundant sunlight to aid in photosynthesis.
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Answer: A) Corals can grow abundantly in freshwater

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