The Narmada river in the Peninsular plateau flows westward with a remarkably straight channel. It is because the:

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Q: 53 (NDA-I/2011)
The Narmada river in the Peninsular plateau flows westward with a remarkably straight channel. It is because the:

question_subject: 

Geography

question_exam: 

NDA-I

stats: 

0,104,26,13,3,10,104

keywords: 

{'narmada river': [0, 0, 1, 2], 'peninsular plateau': [0, 0, 0, 1], 'river channel pattern': [0, 0, 0, 1], 'deccan plateau': [4, 0, 4, 0], 'river forms': [0, 0, 0, 1], 'river': [4, 0, 1, 2], 'trough': [0, 0, 0, 2], 'rift valley': [3, 1, 1, 0], 'straight channel': [0, 0, 0, 1], 'central highlands': [1, 0, 0, 0], 'slope gradient': [0, 0, 0, 1], 'straight channel course': [0, 0, 0, 1], 'boundary': [1, 0, 3, 6]}

The correct answer is option 4 - the Narmada river flows through the trough of a rift valley inclined westward.

The Narmada river is known for its remarkably straight channel that flows westward in the Peninsular plateau. This straight channel is a result of the geology of the region. Option 4 explains that the river flows through the trough of a rift valley that is inclined westward.

A rift valley is a linear depression that forms when the Earth`s crust stretches and breaks apart. In this case, the Narmada river flows through the trough of such a rift valley. The westward inclination of the rift valley influences the flow of the river, causing it to follow a straight course in that direction.

Options 1, 2, and 3 do not accurately explain the reason for the remarkably straight channel of the Narmada river. Option 1 suggests that the slope gradient controls the river channel pattern, but it does not provide an explanation for the straightness of the channel. Option 2 suggests that the amount of water carried by the river has created a straight channel, which is not supported by evidence. Option 3 states that the river forms the boundary between the Central Highlands and the Deccan Plateau, but