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IB ESS SL 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 SL
Level
SL

Exam points

  • identify sources of water pollution including agricultural runoff, sewage, industry, plastics, oil, deforestation and urban development
  • explain how pollutants alter water chemistry, turbidity, oxygen, habitats, biodiversity and human health
  • interpret comparative water-quality data to deduce likely pollution sources and support the conclusion with evidence

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Study 4.4.1—Water pollution sources conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB ESS SL 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:

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