Assertion (A): The frequency of floods in North Indian plains has increased during the last couple of decades.

Question

Assertion (A): The frequency of floods in North Indian plains has increased during the last couple of decades. Reason (R): There has been reduction in the depth of river valleys due to deposition of silt.

Accepted Answer

The correct answer is A because both statements are factually accurate and share a direct cause and effect relationship.

Assertion A is true because data shows an increasing trend in flood frequency in North India due to factors like climate change, deforestation, and land use changes.

Reason R is true because intensive soil erosion in the Himalayan catchment areas leads to heavy siltation in the riverbeds of the plains. This deposition of silt raises the riverbed and reduces the depth and carrying capacity of the river channels. When the river can no longer hold the volume of water during peak rainfall, it overflows its banks more easily, leading to frequent floods. Therefore, R directly explains why the frequency of flooding in the plains has increased.

Answer

Both A and R are true, and R is the correct explanation of A

Answer

Both A and R are true, but R is not a correct explanation of A

Answer

A is true, but R is false

Answer

A is false, but R is true

Assertion (A): The frequency of floods in North Indian plains has increased during the last couple of decades. Reason (R): There has been reduction in the depth of river valleys due to deposition of silt.

Explanation

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