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Q. Which of the following is/are responsible for Coral Bleaching?
  1. Overexposure to high solar irradiance.
  2. Extreme low tides.
  3. Increase in the amount of Phytoplankton.
Select the correct answer using the code given below:

  1. 1, 2 and 3

  2. 1 and 2 only

  3. 2 and 3 only

  4. 1 and 3 only


Solution

The correct option is B
1 and 2 only
Explanation:

Statement 1 is correct:
High solar irradiation causes bleaching of the photosynthetic pigments even when the algae are not expelled.

Statement 2 is correct: Exposure to the air during extreme low tides can cause bleaching in shallow corals.

Statement 3 is incorrect: Phytoplankton causes coral polyps to grow, as an increase in phytoplankton increases the amount of zooplankton available for the corals to feed on.

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