Wells and tube-wells are the dominant source of irrigation in Rajasthan, accounting for nearly 70% of the total irrigated area.

• Canals: Irrigate about 27-30% of total irrigated area (predominantly in the north and northwest).
• Pond: Irrigate less than 1% of total irrigated area.
• Wells & Tube-wells: Account for roughly 68-70% of net irrigated area across eastern, central, and southern Rajasthan.
• None of the above: Incorrect.

In water footprint terminology, green water refers to precipitation stored in soil root zones, incorporated into plant biomass, and consumed via evapotranspiration.

• Blue water: Refers to fresh surface and groundwater found in rivers, lakes, reservoirs, and aquifers.
• Grey water: Volume of freshwater required to assimilate pollutant loads to meet water quality standards.
• Green water: Represents soil moisture originating from rainfall that is absorbed by plants and utilized in photosynthesis and transpiration.
• Yellow water: Specific sanitation term for separated urine, not an agro-hydrological water footprint category.

• According to the official Agricultural Statistics of Rajasthan published by the Directorate of Economics and Statistics (DES):
  • Net Irrigated Area in the state is approximately 8.8 to 9.0 million hectares.

• Gross Irrigated Area in the state stands at approximately 11.5 to 12.0 million hectares (historically ~10.5 to 11.8 m ha).

• In this RPSC examination, Option 3 (designated around 10.5–11.5 million hectares) was officially keyed as the closest statistical bracket for gross irrigated area.

The endless circulation of water as it evaporates from oceans/land, condenses in the atmosphere, and precipitates back to Earth is termed the hydrological cycle.

• Geohydrological cycle: Focuses specifically on underground water flow and aquifer systems.
• Hydrological cycle: Defined as the continuous movement of water on, above, and below the surface of the Earth across hydrosphere, atmosphere, and lithosphere.
• Rainfall cycle: Refers merely to precipitation patterns or monsoonal seasonality.
• None of the above: Incorrect.