Q BankQuestion BankDocsDocuments

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
SL

Exam analysis

Chance of appearing2%of analysed past papers
Latest appearanceNovember 2025
Most common paperPaper1A
Typical marks1–3

Common command terms

  • Outline
  • State

Recent exam appearances

November 2025Paper2 ["SL"] · TZ36(b)[ 3 ]A4.2.6—Causes of biodiversity crisis
May 2025Paper1A ["SL"] · TZ223[ 1 ]A4.2.6—Causes of biodiversity crisis
May 2019Paper3 ["SL"] · TZ113[ 3 ]A4.2.6—Causes of biodiversity crisis
Practice this objective

Coverage 2019–2025 · 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 SL