Cambridge IGCSE Biology
20.3Pollution
Pollution in Cambridge IGCSE Biology: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic42 practice questions2 lessons
Overview
Eutrophication is Supplement.
Learning objectives
What the syllabus expects you to be able to do.
- 20.3.1Describe the effects of untreated sewage and excess fertiliser on aquatic ecosystems and of non-biodegradable plastics on aquatic and terrestrial ecosystems.
- 20.3.2Describe the sources and effects of air pollution by methane and carbon dioxide, limited to the enhanced greenhouse effect and climate change.
- 20.3.3Supplement: explain the sequence of events in eutrophication, from extra nitrate to the death of organisms that need dissolved oxygen.
Lessons
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Pollution of water and land
18 min
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The enhanced greenhouse effect and climate change
18 min
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Sample question
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