IGCSE Biology - Conservation (20.4)

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Cambridge IGCSE Biology (0610/0970)
Chapter 20 - Human influences on ecosystems
Topic 20.4 - Conservation
For exams in 2023, 2024 & 2025 (core and extended)

As always this video follows the Cambridge syllabus exactly and contains absolutely everything you need to know for your final exam!

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Timestamps:
0:00 Contents
0:43 Sustainable resources
1:15 Reasons for extinction
2:16 How endangered species are conserved
3:06 Conservation of forests (extended)
3:38 Conservation of fish stocks (extended)
4:32 Reasons for conservation programmes (extended)
5:19 Artificial insemination (extended)
5:36 In vitro fertilisation (extended)
5:58 Risks to a species if its population size decreases (extended)

Core content:
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.
State that some resources can be conserved and managed sustainably, limited to forests and fish stocks.
Explain why organisms become endangered or extinct, including: climate change, habitat destruction, hunting, overharvesting, pollution and introduced species.
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.

Extended content:
Explain how forests can be conserved using: education, protected areas, quotas and replanting.
Explain how fish stocks can be conserved using: education, closed seasons, protected areas, controlled net types and mesh size, quotas and monitoring.
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.
Describe the use of artificial insemination (AI) and in vitro fertilisation (IVF) in captive breeding programmes.
Explain the risks to a species if its population size decreases, reducing genetic variation (knowledge of genetic drift is not required).