environment medium mcq

Which of the following is a major threat to coral reefs globally?

  1. Increased ocean alkalinity
  2. Coral bleaching due to rising sea temperatures
  3. Decreased salinity
  4. Overfishing of herbivorous fish only

Answer: Coral bleaching due to rising sea temperatures

Warmer waters cause corals to expel symbiotic algae (zooxanthellae), leading to bleaching, reduced growth, and potential mortality.

Topic Marine and Coastal Environment
Exam Relevance UPSC, SSC

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