C4.1.5—Carrying capacity
Carrying capacity explains how ecological evidence links organisms, resources and interactions to population size, distribution or community structure in a habitat.
- Syllabus
- First assessment 2025
- Objective
- C4.1.5
- Level
- HL
Exam analysis
Chance of appearing4%of analysed past papers
Latest appearanceNovember 2025
Most common paperPaper2
Typical marks2
Common command terms
- Identify
- Describe
- Explain
- Outline
- State
Scoring notes
- Common mistake
- Confusing a population with a community or with all organisms in an ecosystem.
Recent exam appearances
November 2025Paper2 ["HL"] · TZ15(a)[ 2 ]C4.1.5—Carrying capacity
November 2023Paper3 ["HL"] · TZ218(c)[ 2 ]C4.1.5—Carrying capacity
May 2019Paper3 ["HL"] · TZ216(b)[ 2 ]C4.1.5—Carrying capacity
May 2014Paper1 ["HL"] · TZ217[ 1 ]C4.1.5—Carrying capacity
May 2012Paper2 ["HL"] · TZ27(c)[ 6 ]C4.1.5—Carrying capacity
Practice this objective
Coverage 2012–2025 · Updated 16 Jul 2026
Concept essentials
- Carrying capacity must be linked to the correct ecological unit, method or species interaction.
- The evidence for carrying capacity depends on measurable abundance, distribution, survival or resource patterns.
- Carrying capacity is clearest when cause, ecological process and population outcome are kept distinct.
- Field or graph evidence for carrying capacity needs biological interpretation, not values alone.