Answer: Point source: pollution from a single identifiable location (factory pipe, sewage outfall); Non-point source: diffuse pollution from many sources over large areas (agricultural runoff, urban stormwater); non-point source is harder to regulate and control.
- A Both terms are sometimes mistakenly thought to be largely functionally identical in regulatory practice, with agencies worldwide using them interchangeably when classifying outfalls and runoff according to conventional understanding in routine practice
- B Point source: pollution from a single identifiable location (factory pipe, sewage outfall); Non-point source: diffuse pollution from many sources over large areas (agricultural runoff, urban stormwater); non-point source is harder to regulate and control
- C Point source pollution is sometimes mistakenly thought to be inherently and consistently less harmful than non-point source pollution, mainly because it is continuously and rigorously monitored overall in most cases under typical conditions according to standard textbooks
- D Non-point source pollution is sometimes mistakenly thought to be comparatively far easier to monitor and trace than point source pollution, since it originates from a single outfall in general practice as frequently described in most textbook accounts
Correct answer: B. Point source: pollution from a single identifiable location (factory pipe, sewage outfall); Non-point source: diffuse pollution from many sources over large areas (agricultural runoff, urban stormwater); non-point source is harder to regulate and control
Explanation: Point source pollution: single, identifiable discharge point (factory effluent pipe, sewage treatment outfall) - easier to monitor and regulate. Non-point source: dispersed across wide areas (agricultural fertilizer/pesticide runoff, urban stormwater, atmospheric deposition) - major cause of water body degradation globally, harder to control because no single source to target.
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.