Q. Consider the following:

1. On the basis of discharge of water, Indian drainage system can be grouped into three categories.
2. The Delhi ridge, the Aravallis and the Sahyadris separate the Arabian Sea and the Bay of Bengal drainage.
3. More percentage of drainage area is orientated towards Arabian Sea.

Which of the above is / are correct?
Answer: Only 2
Notes: On the basis of discharge of water (orientation to the sea), Indian drainage system may be grouped into: the Arabian Sea drainage; and the Bay of Bengal drainage. They are separated from each other through the Delhi ridge, the Aravallis and the Sahyadris. Nearly 77 per cent of the drainage area consisting of the Ganga, the Brahmaputra, the Mahanadi, the Krishna, etc. is oriented towards the Bay of Bengal while 23 per cent comprising the Indus, the Narmada, the Tapi, the Mahi and the Periyar systems discharge their waters in the Arabian Sea.