AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
'Palar pani' is the local term for rainwater in Rajasthan. It is considered the purest form of natural water and is stored in underground tanks called tankas for drinking purposes.
Source: Rainwater Harvesting, Chapter 3
The passage directly states: "Rainwater, or palar pani, as commonly referred to in these parts, is considered the purest form of natural water." For a 1-mark answer, mention (1) what it means — rainwater, and (2) why it is special — purest natural water. No extra detail needed.