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C4.1.8—Modelling sigmoid growth

Modelling sigmoid growth explains how ecological evidence links organisms, resources and interactions to population size, distribution or community structure in a habitat.

Syllabus
First assessment 2025
Objective
C4.1.8
Level
SL

Concept essentials

  • Modelling sigmoid growth must be linked to the correct ecological unit, method or species interaction.
  • The evidence for modelling sigmoid growth depends on measurable abundance, distribution, survival or resource patterns.
  • Modelling sigmoid growth is clearest when cause, ecological process and population outcome are kept distinct.
  • Field or graph evidence for modelling sigmoid growth needs biological interpretation, not values alone.
ConceptIB Biology SL