Answer: organic pollutant.
- A organic pollutant
- B oxygen content
- C mineral content
- D water content
Correct answer: A. organic pollutant
Explanation: Treatment lowers the organic (polluting) load of sewage before discharge.
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.