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IB Biology HL A4.2.8 EDGE of Existence Question Bank

Practise IB Biology HL A4.2.8 by explaining how EDGE estimates lost evolutionary history and prioritises threatened species with few close relatives.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain how EDGE estimates lost evolutionary history when prioritising threatened species.
  • Use programme evidence to justify conserving species with few close relatives and high extinction risk.

A4.2.8—EDGE of Existence programme 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 A4.2.8—EDGE of Existence programme 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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