IB ESS HL 3.1.11 Reproductive Isolation Question Bank
Explain prezygotic and postzygotic isolation in speciation.
- Syllabus
- First assessment 2026
- Course
- ESS HL
- Level
- HL
Exam points
- identify the biodiversity or evolutionary process
- apply the correct diversity, selection or conservation concept
- justify the conclusion with evidence and ecological reasoning
3.1.11 (HL)—Reproductive isolation question 1
Figure:Proportion of New Zealand species that are endemic
Figure:Fact file on biodiversity in New Zealand
Figure: Fact file on biodiversity in New Zealand
New Zealand is a geographically isolated island system which became separated from the southern supercontinent 85 million years ago. It has many endemic species, including flightless birds such as Kiwi, Kākāpō and Takahē, which evolved in the absence of terrestrial ground predators.
Outline two factors that may have contributed to the large number of species only found within New Zealand.
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