Discussion
Assertion (A) : Rejuvenation accelerates the erosive power of the rivers.
Reason (R) : Rejuvenation shortens the cycle of erosion.
Which one of the following is correct ?
Answer: C
(A) is true but (R) is false.
Rejuvenation is the renewal of a river's erosive power when its base level falls or the land is uplifted. The river cuts down again, producing knickpoints, river terraces and incised meanders, so the assertion is true.
The reason is false: rejuvenation does not shorten the cycle of erosion. It interrupts it and starts a new cycle, so the old landscape is never carried through to a peneplain and the time needed to reach that end stage is lengthened. Since (R) is false, options A, B and D fail.
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