Civil Services Prep

Prelims MCQ · Geography

Consider the following Assertion and Reason:

Assertion (A): A fall in sea level or an uplift of land may renew vertical erosion by a river and produce terraces and a knickpoint.

Reason (R): Such a negative movement lowers the river’s base level and steepens its gradient, increasing its capacity for down-cutting.

Which one of the following is correct?

  1. Both A and R are true, and R is the correct explanation of A.
  2. Both A and R are true, but R is not the correct explanation of A.
  3. A is true, but R is false.
  4. A is false, but R is true.
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