IB Biology SL D4.2.2 Requirements for Stability Questions

Explain how ecosystems depend on energy input, nutrient cycling, biodiversity and genetic diversity, and why key species persist only within suitable abiotic ranges.

Exam points

Explain how biodiversity can support ecosystem stability and resistance to change through complex food webs and alternative food sources.
Identify species adapted to the same abiotic conditions.

[Maximum number: 2]

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.

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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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IB Biology SL D4.2.2 Requirements for Stability Questions question 1