Statement I : Most of the east flowing rivers over the Deccan plateau have deltas at their mouth. Statement II : These rivers have courses through soft rocks of the Deccan . plateau.

Statement I is true as major east-flowing rivers like the Mahanadi, Godavari, Krishna, and Kaveri form extensive deltas at their mouths along the East Coast [3]. These deltas are formed because the rivers carry significant sediment loads over long courses and deposit them in the relatively calm, shallow waters of the Bay of Bengal [t3][t5]. However, Statement II is false. The Deccan Plateau is primarily composed of hard, resistant igneous rocks like basalt (Deccan Traps) and ancient metamorphic rocks, rather than soft rocks [t4][t7]. These hard rocks actually provide less material for erosion compared to Himalayan rivers [t4]. The formation of deltas is attributed to the gentle gradient of the eastern slope, the long distance traveled by the rivers, and the low-energy environment of the East Coast, rather than the presence of soft rocks [t2][t5].

Sources

1. [1] Exploring Society:India and Beyond ,Social Science-Class VII . NCERT(Revised ed 2025) > Chapter 1: Geographical Diversity of India > The East Coast > p. 20
2. [2] CONTEMPORARY INDIA-I ,Geography, Class IX . NCERT(Revised ed 2025) > Chapter 2: Physical Features of India > The Coastal Plains > p. 13
3. [3] CONTEMPORARY INDIA-I ,Geography, Class IX . NCERT(Revised ed 2025) > Chapter 3: Drainage > The Peninsular Rivers > p. 21