Consider the following assertion :
In the Pleistocene period either the Yamuna once flowed into the Indus, or the Sutlej flowed into the Yamuna and one major tributary of either had shifted from the Ganga to the Indus or vice versa.
Which of the following is/are the basis of the above assertion ?
- 1. The Nadi-Sukta of the Rigveda
- 2. The explorations of the Sutlej and the Yamuna by Robert Bruce Foote
- 3. The presence of the same species of dolphins in both the Indus and the Ganga river systems
Select the answer using the code given below :
Answer (d) & explanation
Only the dolphin evidence is a basis (d). Item 3 is right: the Indus and Ganga river dolphins are so close that they were long treated as one species, which only makes sense if the two river systems were once joined. Item 1 is wrong: the Pleistocene ended about 12,000 years ago, long before the Rigveda, so the Nadi-Sukta cannot be evidence for it. Item 2 is wrong: Robert Bruce Foote worked on the stone ages of South India, not these rivers.
Notice the Ganges river dolphin is India's national aquatic animal, and is nearly blind, using echolocation. Project Dolphin (2020) protects it. The Indus dolphin lives mainly in Pakistan, with a small group in the Beas in Punjab.
Answer as per the official UPSC answer key.
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