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IB Biology HL A4.1.9 Hl Adaptive Radiation Questions

Practise explaining how species from one ancestor adapt to different ecological niches, using Darwin's finches and their beaks as an example.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain how adaptive radiation produces related species from one ancestor as populations diverge into different ecological niches.
  • Use Darwin’s finch beak adaptations to illustrate how populations adapt to different feeding niches.

IB Biology HL A4.1.9 Hl Adaptive Radiation Questions question 1

[Maximum number: 3]

Evolution occurs when heritable characteristics of a species change. The diagram shows an evolutionary chart of elephants.

Figure for Question IB Biology HL A4.1.9 Hl Adaptive Radiation Questions question 1 — IB Biology HL

Charles Darwin observed differences in the beaks of several finch species on the Galapagos Islands.

1. G. magnirostris

1. G. magnirostris

3. G. parvula

3. G. parvula

2. G. fortis

2. G. fortis

4. C. olivacea

4. C. olivacea

Outline the development of beak differences in these finches.

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