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IB Biology HL A4.2.8 Edge of Existence Programme Questions

Practise IB Biology HL A4.2.8 by linking small clades, extinction risk and expected evolutionary-history loss to conservation decisions.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain how EDGE estimates expected loss of evolutionary history by combining evolutionary distinctiveness with extinction risk.
  • Use EDGE evidence about small clades and threatened populations to justify conservation priorities and actions.

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Study A4.2.8—EDGE of Existence programme conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL A4.2.8 Edge of Existence Programme Questions question 1

[Maximum number: 2]

The graph shows the change in forest area in Greater Mekong countries in Southeast Asia between 1973 and 2009. This was mainly due to deforestation.

Figure for Question IB Biology HL A4.2.8 Edge of Existence Programme Questions question 1 — IB Biology HL

The EDGE of Existence programme measures Evolutionary Distinctness (ED) and Globally Endangered status (GE).

Outline the importance of the EDGE of Existence programme.

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