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A4.2.6—Causes of biodiversity crisis

The biodiversity crisis is driven by human population pressure, land-use change, overexploitation, pollution, climate change, and invasive species disrupting communities.

Syllabus
First assessment 2025
Objective
A4.2.6
Level
HL

Exam analysis

Chance of appearing1%of analysed past papers
Latest appearanceMay 2025
Most common paperPaper2
Typical marks1

Common command terms

  • Outline
  • State

Recent exam appearances

May 2025Paper2 ["HL"] · TZ26(b)[ 1 ]A4.2.6—Causes of biodiversity crisis
Practice this objective

Coverage 2025–2025 · Updated 15 Jul 2026

Concept essentials

  • Urbanization and agricultural land clearance reduce habitat and fragment ecosystems.
  • Overexploitation removes organisms faster than populations can replace them.
  • Pollution must be linked to a specific source or effect to explain biodiversity loss.
  • Invasive alien species can threaten native populations through competition, predation or ecosystem disruption.
ConceptIB Biology HL