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Q92
(CDS-I/2011)
Environment & Ecology › Pollution & Conservation › Water conservation measures
Answer Verified
Rainwater collected after 30 to 40 minutes of raining is not suitable for drinking because it
Result
Your answer:
—
·
Correct:
C
Explanation
The correct answer is Option 3: is deficient in minerals.
While rainwater is a pure form of natural water, its primary drawback for long-term human consumption is its lack of essential minerals. Here is why Option 3 is the most accurate explanation:
- Mineral Deficiency: Rainwater is essentially distilled water. It lacks vital minerals like calcium, magnesium, and potassium that are naturally found in groundwater. Consuming mineral-deficient water can lead to electrolyte imbalances in the body.
- Atmospheric Cleaning: After 30 to 40 minutes of continuous rain, the atmosphere is effectively "washed." Most suspended particulate matter (dirt), bacteria (Option 1), and dissolved gases (Option 4) are removed during the initial minutes of a downpour.
- Acidity and Toxins: While initial rain can be slightly acidic due to dissolved CO2 or industrial pollutants, this acidity levels off as the rain continues. Therefore, after 40 minutes, the primary concern is not toxicity or acidity, but the absence of nutritional minerals required for health.
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