Biology · IGCSE · Cambridge · Cambridge IGCSE (9–1) Biology 0970 (Extended) (2026–2028) · Specification point · 20.4 · Human influences on ecosystems
20.4 Conservation
| Core | Supplement |
|---|---|
1 Describe a sustainable resource as one which is produced as rapidly as it is removed from the environment so that it does not run out | |
2 State that some resources can be conserved and managed sustainably, limited to forests and fish stocks | |
3 Explain why organisms become endangered or extinct, including: climate change, habitat destruction, hunting, overharvesting, pollution and introduced species | |
4 Describe how endangered species can be conserved, limited to: (a) monitoring and protecting species and habitats (b) education (c) captive breeding programmes (d) seed banks | 5 Explain how forests can be conserved using: education, protected areas, quotas and replanting |
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6 Explain how fish stocks can be conserved using: education, closed seasons, protected areas, controlled net types and mesh size, quotas and monitoring |
7 Describe the reasons for conservation programmes, limited to: (a) maintaining or increasing biodiversity (b) reducing extinction (c) protecting vulnerable ecosystems (d) maintaining ecosystem functions, limited to nutrient cycling and resource provision, including food, drugs, fuel and genes |
8 Describe the use of artificial insemination (AI) and in vitro fertilisation (IVF) in captive breeding programmes |
9 Explain the risks to a species if its population size decreases, reducing genetic variation (knowledge of genetic drift is not required) |