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IB Biology SL A4.2.4 Ecosystem Loss Causes Questions

Explain how deforestation, fragmentation and climate or acidification pressures remove habitat and reduce ecosystem biodiversity.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Explain how deforestation and habitat conversion reduce species richness by removing food, shelter and breeding sites.
  • Explain how forest fragmentation changes biodiversity through edge effects, isolation, species movement and turnover.
  • Link rising sea temperature or ocean acidification to coral bleaching, skeleton loss and biodiversity decline on coral reefs.

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Study A4.2.4—Ecosystem loss causes conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology SL A4.2.4 Ecosystem Loss Causes Questions question 1

[Maximum number: 1]

Data from the International Union for Conservation of Nature (IUCN) indicates that the population numbers of many mammal species are decreasing. The chart shows reasons for the decrease and the number of species in each category of danger.

Figure for Question IB Biology SL A4.2.4 Ecosystem Loss Causes Questions question 1 — IB Biology SL

Outline how deforestation can affect the richness of biodiversity in an ecosystem.

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