With reference to India, which one the following statements is correct?
A
About one-third of the area of the country records more than 750 millimetres of annual rainfall
B
The dominant source of irrigation in the country is wells
C
Alluvial soil is the predominant type of soil in the northern plans of the country
D
The mountain areas accounts for about thirty percent of the surface area of the country
Correct Answer: Option B
Explanation
1. Statement A is correct. While rainfall varies significantly across India, regions receiving over 750 mm annually (including the Western Ghats, Northeast India, and parts of the Himalayas and coastal plains) constitute roughly one-third of the country's area.
2. Statement B is incorrect. While wells (including tubewells) are a major source, canals are also a dominant source of irrigation, especially in the northern plains.
3. Statement C is incorrect. Alluvial soil is predominant in the northern plains, but not necessarily the predominant type for the entire country, which includes large areas of black soil, red soil, laterite soil etc.
4. Statement D is incorrect. Mountain areas account for a significant portion, but closer to 10-15% of the total surface area, not thirty percent.