Q. With reference to corals, consider the following statements:
1. Corals are found only in tropical water.
2. Among the hard and soft corals, only hard corals can build reefs.
Which of the above statements is/are correct?

[A] 1 only

[B] 2 only

[C] Both 1 and 2

[D] Neither 1 nor 2

Answer: B
Notes:

Statement 1 is incorrect: While the majority of coral reefs are found in tropical and sub-tropical waters, there are also deep-water corals in colder regions. According to the United Nations Environment Programme, there are more cold-water coral reefs worldwide than tropical reefs. The largest cold-water coral reef is the Rost Reef off Norway. 

Statement 2 is correct: There are two major types of corals: hard corals and soft corals, such as sea fans and gorgonians. Only hard corals build reefs. 

Source: DTE