Q. 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:
(a) 1 only
(b) 2 only
(c) 1 and 2
(d) 3

Answer : A

Explanation:

Statement I is not correct: Reflects Vedic-era geography (~1500–1200 BCE), not Pleistocene geology. It is a literary/cultural source, not a scientific basis for ancient drainage reorganization.
Statement II is not correct: Robert Bruce Foote is renowned as the "Father of Indian Prehistory" for discovering Paleolithic stone tools in South India. His extensive geological fieldwork focused on human prehistory and stratigraphy rather than the fluvial geomorphology or river capture of the Yamuna-Sutlej system in the north.
Statement III is correct: The Ganges dolphin (Platanista gangetica) and Indus dolphin (Platanista minor) are so closely related that they are considered the same species or subspecies.

Source: https://egyankosh.ac.in/bitstream/123456789/37930/1/Unit-4.pdf
https://egyankosh.ac.in/bitstream/123456789/64774/1/Unit2.pdf