Consider the following statements regarding the evolution of India’s major drainage systems:
1. The ancient Indo-Brahma river is believed to have split into three major drainage systems over time.
2. The Ganga and its Himalayan tributaries represent the central drainage system.
3. The western drainage system consists of the Brahmaputra and its tributaries.
Which of the above statements is/are correct?

Correct option is D

The correct answer is: (d) Only 1 and 2
Explanation:
· Statement 1: Correct – The ancient Indo-Brahma River (also called Shiwalik or Siwalik river) is believed to have gradually split into three major drainage systems: Indus, Ganga, and Brahmaputra.
· Statement 2: Correct – The Ganga and its Himalayan tributaries represent the central drainage system.
· Statement 3: Incorrect – The western drainage system consists of the Indus and its tributaries, not the Brahmaputra. The eastern system consists of the Brahmaputra and its tributaries.
Information Booster:
· The Indo-Brahma River flowed parallel to the Himalayas before disintegration.
· Tectonic activities and the rise of the Himalayas redirected rivers into present drainage systems.
· India has three major drainage systems: Indus (west), Ganga (central), Brahmaputra (east).
· Himalayan rivers are perennial, fed by glaciers and rainfall.
· Peninsular rivers are older, with fixed courses and seasonal flow.