UPSC Prelims 2014 – Question 41

Q: Which of the following have coral reefs?

a) Andaman and Nicobar Islands

b) Gulf of Kachchh

c) Gulf of Mannar

d) Sunderbans

The Correct Answer is 1, 2 and 3 only.

Coral Reefs

• Most of the world’s coral reefs are located within the tropical zone between 30º N and 30º S latitude.
• The most favourable temperature for the growth of the coral reefs is between 23°C to 25°C.
• The Coral reefs in India are mainly restricted to the Andaman and Nicobar Islands, Gulf of Mannar, Gulf of Kutch, Palk Strait and the Lakshadweep islands. Hence, Option 1 is correct.
• All of these reefs are Fringing reefs, except Lakshadweep which are Atolls. While Sundarbans do not have coral reef.
• Corals can survive only under saline conditions with an average salinity between 27% to 40%.

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