|1. Barrier reefs are separated from the mainland by a lagoon.|
|2. Landward slope of a barrier reef is steeper than its seaward slope.|
|3. Barrier reefs are always found as continuous chain.|
|4. The surface of barrier reef is composed of boulders, coral debris and sand deposits|
A) 1 and 2
B) 2 and 3
C) 3 and 4
D) 1 and 4
Correct Answer: D
Solution :Usually the seaward slope of a barrier reef is steeper than the landward slope. Barrier reefs are seldom found as continuous chain, rather they are often broken at several places and gaps are found between different parts of such reefs. Sometimes these passages are so wide that even ships can pass through them.
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