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C4.1.9—Competition vs. cooperation

Competition versus cooperation explains how ecological evidence links organisms, resources and interactions to population size, distribution or community structure in a habitat.

Syllabus
First assessment 2025
Objective
C4.1.9
Level
SL

Exam analysis

Chance of appearing1%of analysed past papers
Latest appearanceNovember 2024
Most common paperPaper2
Typical marks1–2

Common command terms

  • Discuss
  • State
  • Describe
  • Outline
  • Suggest
  • Compare
  • Contrast

Scoring notes

Common mistake
Describing overlapping niches without explaining that one competitor is displaced or restricted.

Recent exam appearances

November 2024Paper2 ["SL"] · TZ11(f)[ 1 ]C4.1.9—Competition vs. cooperation
November 2024Paper2 ["SL"] · TZ11(e)[ 2 ]C4.1.9—Competition vs. cooperation
November 2024Paper2 ["SL"] · TZ11(c)[ 1 ]C4.1.9—Competition vs. cooperation
November 2024Paper2 ["SL"] · TZ11(b)[ 1 ]C4.1.9—Competition vs. cooperation
November 2024Paper2 ["SL"] · TZ11(a)[ 2 ]C4.1.9—Competition vs. cooperation
Practice this objective

Coverage 2024–2024 · Updated 16 Jul 2026

Concept essentials

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