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Edexcel GCSE Combined Science Topic 9 Ecosystems and Material Cycles – Learn Guide

Course Content

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1.1 Levels of organisation

1.2 Interdependence

1.3 Practice: Ecosystems and interdependence

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2.1 Abiotic factors

2.2 Biotic factors

2.3 Practice: Abiotic and biotic factors

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3.3 Practice: Parasitism and mutualism

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4.1 Quadrats and population size

4.2 Belt transects and the core practical

4.3 Practice: Field-work: quadrats and transects

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5.1 Fish farming and introduced species

5.2 Eutrophication

5.3 Practice: Human impact on biodiversity

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6.1 Why biodiversity matters

6.2 Conservation and reforestation

6.3 Practice: Protecting biodiversity

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7.1 Cycling materials and decomposers

7.2 The carbon cycle

7.3 Practice: Material cycles and the carbon cycle

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8.1 The water cycle

8.2 The nitrogen cycle

8.3 Practice: The water and nitrogen cycles

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9.1 Mixed retrieval

9.2 Exam practice