Answer: 1974.
- A 1986
- B 1974
- C 2000
- D 1950
Correct answer: B. 1974
Explanation: The Water (Prevention and Control of Pollution) Act was enacted in 1974, while the Air Act came in 1981 and the broader Environment Protection Act in 1986.
Sunlight passes through the atmosphere and warms the surface; the surface re-radiates this energy as infrared heat, which greenhouse gases (CO₂, CH₄, water vapour) absorb and trap - a naturally beneficial process that intensifies into global warming as gas concentrations rise from human activity.
Concept context
Pollution, global warming, ozone depletion, deforestation, and sustainability. Important for NEET and general awareness.