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C4.1.3—Random quadrat sampling

Random quadrat sampling explains how ecological evidence links organisms, resources and interactions to population size, distribution or community structure in a habitat.

Syllabus
First assessment 2025
Objective
C4.1.3
Level
SL

Exam analysis

Chance of appearing2%of analysed past papers
Latest appearanceMay 2023
Most common paperPaper3
Typical marks2–3

Common command terms

  • Outline
  • Distinguish
  • Determine
  • Describe

Scoring notes

Common mistake
Confusing a population with a community or with all organisms in an ecosystem.

Recent exam appearances

May 2023Paper3 ["SL"] · TZ113(c)[ 3 ]C4.1.3—Random quadrat sampling
May 2014Paper3 ["SL"] · TZ220(c)[ 2 ]C4.1.3—Random quadrat sampling
May 2014Paper3 ["SL"] · TZ120[ 2 ]C4.1.3—Random quadrat sampling
Practice this objective

Coverage 2014–2023 · Updated 16 Jul 2026

Concept essentials

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