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Question 13

Biology SL Paper 3 (November 2024, TZ2)

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  1. High-temperature tolerance experiments were performed on Pocillopora damicornis, a coral in the tropical eastern Pacific, in the Gulf of Panama. The scattergraph shows the zooxanthellae densities at three temperature treatments over a 10-week period.
Scattergraph showing the number of zooxanthellae per coral surface area (logarithmic scale) over time (weeks) for three temperature treatments: 28 °C, 30 °C, and 32 °C.
Scattergraph showing the number of zooxanthellae per coral surface area (logarithmic scale) over time (weeks) for three temperature treatments: 28 °C, 30 °C, and 32 °C.

Using the data, explain the effect of temperature on coral bleaching in the Gulf of Panama. [2]