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D4.1.4—Abiotic factors as selection pressures

Abiotic factors such as temperature, water availability, salinity, light and pH can act as selection pressures in evolving populations in evolving populations.

Syllabus
First assessment 2025
Objective
D4.1.4
Level
HL

Concept essentials

  • Abiotic factors are non-living parts of the environment.
  • Abiotic selection pressures can change survival and reproductive success.
  • Heritable tolerance traits can become more common under persistent abiotic pressure.
ConceptIB Biology HL