Which of the following can be a trigger for Coral Bleaching 1 Addition of fresh...........

Environment and Ecology Sustainable Development

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Which of the following can be a trigger for Coral Bleaching?

1. Addition of fresh water from rivers and glaciers.

2. High sea surface temperatures due to climate change.

3. A massive El Niño event.

Select the correct answer using codes given below

1 and 2 only

2 and 3 only

All of the above

1 only

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Explanation:

All of the statements are correct. Coral bleaching occurs when coral polyps expel algae that lives inside their tissues. Normally, coral polyps live in an endosymbiotic relationship with the algae and that relationship is crucial for the coral and hence for the health of the whole reef.

All of the above are correct.
When corals are stressed by changes in conditions such as temperature, light, or nutrients, they expel the symbiotic algae living in their tissues, causing them to turn completely white.