IB Biology SL D4.2.2 Requirements for Stability Questions
Relate biodiversity and compatible abiotic tolerance ranges to ecosystem stability and resilience.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Explain how biodiversity provides complex food webs and alternative food sources that improve ecosystem stability, adaptability and resistance to damage.
- Identify key species that can persist together when their tolerance ranges match the same abiotic conditions.
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IB Biology SL D4.2.2 Requirements for Stability Questions question 1
Beavers (Castor fiber) have been reintroduced into many European countries. They cut down trees and use them as a source of food as well as for building their homes and dams.
Studies show that species richness of large invertebrates increases in the presence of beavers. Suggest reasons why biodiversity is important in an ecosystem.
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