The correct option is (c) 1 and 3 only.
Explanation
The Deccan Plateau is a large triangular landmass that forms the majority of the southern part of the Peninsular Plateau of India. It is bounded by the Western Ghats in the west, the Eastern Ghats in the east, and the Satpura, Maikal, and Mahadeo hills in the north.
Statement-wise Analysis
- Statement 1 is Correct: The Deccan Plateau is a triangular landmass located to the south of the river Narmada. This river divides the Peninsular Plateau into two broad divisions: the Central Highlands to the north and the Deccan Plateau to the south.
- Statement 2 is Incorrect: The plateau is higher in the west and slopes gently eastwards. This general slope is evidenced by the direction of flow of major peninsular rivers such as the Mahanadi, Godavari, Krishna, and Kaveri, which originate in the Western Ghats and flow towards the Bay of Bengal.
- Statement 3 is Correct: The Satpura range flanks the broad base of the triangular plateau in the north. While the Satpura range forms the northern boundary, the Mahadev, Kaimur hills, and Maikal range form its eastern extensions.
Key Takeaway: The Deccan Plateau is a triangular landmass south of the Narmada river, characterized by a general slope from west to east, causing most peninsular rivers to drain into the Bay of Bengal.