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IB Biology SL A4.2.5 Evidence for Biodiversity Crisis Questions

Practise comparing disturbed and undisturbed habitats using species-diversity measures, then judge whether evidence from surveys and studies is reliable.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Use richness, evenness and Simpson’s reciprocal index to compare disturbed and undisturbed habitats.
  • Interpret IPBES reports and repeated biodiversity surveys as evidence of a biodiversity crisis.
  • Assess reliability checks when using peer-reviewed studies and citizen-science data.

IB Biology SL A4.2.5 Evidence for Biodiversity Crisis Questions question 1

[Maximum number: 2]

The sinking of the tanker Eurobulker off the coast of Greece in September 2000 resulted in a spill of 700 tonnes of crude oil. The sands in the oil spill region were categorized according to the level of pollution and the presence of indicator species.

The graph shows the trends in richness of all species in the five ecological quality status categories in sands after the oil spill.

Figure for Question IB Biology SL A4.2.5 Evidence for Biodiversity Crisis Questions question 1 — IB Biology SL

Analyse the data to show that pollution affects biodiversity.

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