IB ESS HL 4.4.1 Water Pollution Sources Questions
Identify point and non-point sources and trace pollutants into water systems.
- Syllabus
- First assessment 2026
- Course
- ESS HL
- Level
- HL
Exam points
- identify water-pollution sources including deforestation, flooding, sewage, agriculture, industry, plastics, oil and urban runoff
- explain how these sources alter water flow, habitats, chemistry, turbidity, oxygen, biodiversity and human communities
- deduce likely pollution sources from biological, abiotic and comparative data and justify the conclusion with evidence
IB ESS HL 4.4.1 Water Pollution Sources Questions question 1
[Maximum number: 2]
A small lake is going through the process of eutrophication. State one possible point source and one possible non-point source of nutrient pollution in the lake.
Point source:
Non-point source:
point source: sewage outfall/effluent pipe;
non-point source: agricultural/erosion/run-off/leaching of fertilizers in a large area;
Marking guidance:
Do not accept acid rain.
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