Question

Q. Consider the following pairs:

	River Stage	Characteristic
1.	Old	Rapids
2.	Youth	V-shaped Valleys
3.	Mature	Meanders

Which of the above given pairs is/are correctly matched?

• A.
  1 only
• B.
  2 and 3 only
• C.
  1 and 3 only
• D.
  1, 2 and 3

Answer 1

The correct option is B

2 and 3 only
Explanation:

Pair 1 is incorrectly matched: In the old stage, smaller tributaries are few with gentle gradients. Streams meander freely over vast flood plains showing natural levees and oxbow lakes etc. Most of the landscape is at or slightly above sea level. Waterfalls and rapids disappear in the mature stage itself.

Pair 2 is correctly matched: In the youth stage, streams are few with poor integration and flow over original slopes showing shallow V-shaped valleys with no floodplains or with very narrow floodplains along trunk streams.

Pair 3 is correctly matched: A meander is a winding curve or bends in a river. They are typical of the mature and old stage of a river.