- A O2 and N2, the most abundant atmospheric gases
- B CO2, CH4, N2O, and water vapour
- C O3 and H2, released mainly from industrial combustion
- D SO2 only, emitted from coal-burning power plants
Correct answer: B. CO2, CH4, N2O, and water vapour
Explanation: Main greenhouse gases: CO2 (from fossil fuels, deforestation), CH4 (from livestock, rice paddies, natural gas), N2O (from fertilizers), water vapour (most abundant), and CFCs. They trap heat by absorbing outgoing infrared radiation.
Concept context
Pollution, global warming, ozone depletion, deforestation, and sustainability. Important for NEET and general awareness.