Discussion
Which among the following is/are threats for the Great Barrier Reef in Australia ?
A. Surface water temperature rising
B. Crown-of-Thorns Starfishes
C. Oil transportation
D. Tourism
Choose the correct answer from the options given below :
Answer: D
The threats accepted are A and B, so the answer is Only A and B.
Rising sea surface temperature is the greatest threat to the Great Barrier Reef. Water that stays too warm makes corals expel the algae that feed them, causing the mass bleaching events of 2016, 2017 and 2020. Outbreaks of crown-of-thorns starfish, which eat coral polyps, are the other major direct cause of coral loss.
Shipping, including oil transport, and tourism are pressures that the Reef's managers regulate, but they are minor compared with warming and starfish outbreaks. The key therefore rejects the options built on C and D, and 'Only A' leaves out the starfish.
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