In the Caribbean, coral bleaching events have become more frequent. Scientists investigating reefs near Tobago recorded sea surface temperatures 2°C above the historical average. Coral bleaching occurs because:

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Question

In the Caribbean, coral bleaching events have become more frequent. Scientists investigating reefs near Tobago recorded sea surface temperatures 2°C above the historical average. Coral bleaching occurs because:

Accepted Answer

Zooxanthellae algae are expelled due to thermal stress — Award 1 mark for identifying that elevated temperatures cause corals to expel their symbiotic algae. A is incorrect — corals do not directly absorb CO₂; ocean acidification is a separate process. C is incorrect — wave action causes physical damage, not bleaching. D is incorrect — calcium carbonate production relates to coral growth, not bleaching.

Answer

Zooxanthellae algae are expelled due to thermal stress

Answer

Corals absorb too much carbon dioxide from the water

Answer

Increased wave action damages coral tissue

Answer

Corals produce excess calcium carbonate

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