With reference to the evolution of the Himalayan drainage, consider the following statements: 1. The Indo-Brahma river flowed from east to west. 2. The dismemberment of the Indo-Brahma river was likely due to the Pleistocene upheaval in the western Himalayas. 3. The down-thrusting of the Malda gap diverted the Ganga and Brahmaputra systems to flow towards the Arabian Sea. Which of the statements given above is/are correct?

Correct Option The correct option is 1 and 2 only. Explanation The Himalayan drainage system evolved through tectonic uplift, river dismemberment, and diversion of earlier longitudinal drainage. The ancient Indo-Brahma river is considered to have flowed along the longitudinal extent of the Himalayas from the Assam region towards the Punjab and Sind region, indicating an east-to-west course. Its later dismemberment produced separate drainage systems such as the Indus, Ganga, and Brahmaputra systems. - Statement 1: Correct. The Indo-Brahma river is described as an ancient longitudinal river flowing from east to west along the Himalayan foreland. - Statement 2: Correct. Its dismemberment is linked to tectonic disturbances, including the Pleistocene upheaval in the western Himalayas, which affected the drainage pattern. - Statement 3: Incorrect. The down-thrusting of the Malda gap helped divert the Ganga and Brahmaputra systems towards the Bay of Bengal, not the Arabian Sea. Therefore, statements 1 and 2 are correct. Key Takeaway: The Indo-Brahma river flowed east to west, but tectonic changes dismembered it and diverted the Ganga-Brahmaputra drainage towards the Bay of Bengal.

With reference to the evolution of the Himalayan drainage,… - NCERT Class 11 Geography MCQ

NCERT Class 11 Geography — Chapter 4: Drainage systems

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With reference to the evolution of the Himalayan drainage, consider the following statements:

The Indo-Brahma river flowed from east to west.
The dismemberment of the Indo-Brahma river was likely due to the Pleistocene upheaval in the western Himalayas.
The down-thrusting of the Malda gap diverted the Ganga and Brahmaputra systems to flow towards the Arabian Sea.

Which of the statements given above is/are correct?

NCERT textbook question

From NCERT India – Physical Environment · Page 20

Options

A1 and 2 only
B2 only
C2 and 3 only
D1, 2 and 3

Did you get this right?

Solution

Correct Option

The correct option is 1 and 2 only.

Explanation

The Himalayan drainage system evolved through tectonic uplift, river dismemberment, and diversion of earlier longitudinal drainage.

The ancient Indo-Brahma river is considered to have flowed along the longitudinal extent of the Himalayas from the Assam region towards the Punjab and Sind region, indicating an east-to-west course. Its later dismemberment produced separate drainage systems such as the Indus, Ganga, and Brahmaputra systems.

Statement 1: Correct. The Indo-Brahma river is described as an ancient longitudinal river flowing from east to west along the Himalayan foreland.
Statement 2: Correct. Its dismemberment is linked to tectonic disturbances, including the Pleistocene upheaval in the western Himalayas, which affected the drainage pattern.
Statement 3: Incorrect. The down-thrusting of the Malda gap helped divert the Ganga and Brahmaputra systems towards the Bay of Bengal, not the Arabian Sea.

Therefore, statements 1 and 2 are correct.

Key Takeaway: The Indo-Brahma river flowed east to west, but tectonic changes dismembered it and diverted the Ganga-Brahmaputra drainage towards the Bay of Bengal.

Your note

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