AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(C) The purest form of natural water
Rainwater, referred to as palar pani in arid Rajasthan, is considered the purest form of natural water and is collected in underground tankas for drinking.
Source: Water Resources, Chapter 3 (Rainwater Harvesting section)
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The passage directly states: "Rainwater, or palar pani, as commonly referred to in these parts, is considered the purest form of natural water." The tankas store this rainwater — they are not groundwater sources, so option B is wrong. Option D (Indira Gandhi Canal) is actually mentioned as the reason the practice is declining, not as a definition of palar pani. Examiners expect you to quote or closely paraphrase the textbook definition.