Question

Q. With reference to coral reefs, consider the following statements:

Which of the above given statements is/are correct?

• A.
  1 only
• B.
  2 only
• C.
  Both 1 and 2
• D.
  Neither 1 nor 2

Answer 1

The correct option is C

Both 1 and 2
Explanation:

A coral reef is an underwater ecosystem characterized by reef-building corals.

Statement 1 is correct: Reefs are formed of colonies of coral polyps held together by calcium carbonate. Most coral reefs are built from stony corals, whose polyps cluster in groups.

Statement 2 is correct: The largest coral reef is the Great Barrier Reef, which spans 1,600 miles (2,600 km) off the east coast of Australia.