Discussion
Arrange the following steps in the process of coral bleaching.
1. Corals expel their symbiotic algae.
2. Increased water temperature.
3. Corals loose their colour and become stressed.
4. Reduced photosynthetic activity.
Answer: C
The sequence is 2, 1, 4, 3.
- Water temperature rises above the corals' tolerance (2).
- Stressed, the corals expel the symbiotic algae, zooxanthellae, that live in their tissues (1).
- With the algae gone, photosynthesis falls, and so does the food it supplies (4).
- The corals lose their colour, the white skeleton showing through, and are left starved and stressed (3).
The trigger has to come first, which rules out options starting with expulsion or reduced photosynthesis. The loss of colour is the visible end result, which is why it comes last.
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