Q. With reference to Himalayan rivers, which of the following statements is/are correct?
Select the correct answer using the codes given below:
Q. With reference to Himalayan rivers, which of the following statements is/are correct?
Select the correct answer using the codes given below:
The correct option is A 1 and 2 only
Explanation:
Himalayan drainage has evolved through a long geological history. They are fed by both melting of snow and precipitation making rivers of this system perennial. It mainly includes the Ganga, the Indus, and the Brahmaputra river basins.
Statement 1 is correct: The down thrusting of the Malda gap area between the Rajmahal hills and the Meghalaya plateau during the mid-Pleistocene period diverted the Ganga and the Brahmaputra systems to flow towards the Bay of Bengal.
Statement 2 is correct: Less number of Himalayan rivers flow into the ocean because most of the rivers are tributaries of one or the other large river. For example, Son, Ramganga, Gomati, Ghaghara, Gandak, Kosi are all different tributaries of the Ganga river but only Ganga drains into the ocean.
Statement 3 is incorrect: In the Himalayan reaches, the course of these rivers is highly tortuous. But they display a strong meandering tendency in the plains and shift their courses frequently. The meandering of a river is associated with the Mature stage. At Himalayan reaches, the river has not fully lost its youth stage. So they develop a strong meandering tendency in the lower reaches of the Himalayas (in the piedmont/plains).
Explanation:
Himalayan drainage has evolved through a long geological history. They are fed by both melting of snow and precipitation making rivers of this system perennial. It mainly includes the Ganga, the Indus, and the Brahmaputra river basins.
Statement 1 is correct: The down thrusting of the Malda gap area between the Rajmahal hills and the Meghalaya plateau during the mid-Pleistocene period diverted the Ganga and the Brahmaputra systems to flow towards the Bay of Bengal.
Statement 2 is correct: Less number of Himalayan rivers flow into the ocean because most of the rivers are tributaries of one or the other large river. For example, Son, Ramganga, Gomati, Ghaghara, Gandak, Kosi are all different tributaries of the Ganga river but only Ganga drains into the ocean.
Statement 3 is incorrect: In the Himalayan reaches, the course of these rivers is highly tortuous. But they display a strong meandering tendency in the plains and shift their courses frequently. The meandering of a river is associated with the Mature stage. At Himalayan reaches, the river has not fully lost its youth stage. So they develop a strong meandering tendency in the lower reaches of the Himalayas (in the piedmont/plains).
