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IB Biology SL C4.1.3 Random Quadrat Sampling Questions

Use random or transect-based quadrats to identify species, record counts and calculate abundance, density or diversity in IB Biology SL C4.1.3.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Place quadrats randomly or at defined intervals along a transect to sample sessile organisms, identify species and record abundance, density or frequency within each quadrat.
  • Use quadrat area and representative counts to calculate population density, total population estimates or diversity measures for the sampled habitat.

Learn this topic

Study C4.1.3—Random quadrat sampling conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology SL C4.1.3 Random Quadrat Sampling Questions question 1

[Maximum number: 2]

A school football field has plantain plants (Plantago media) growing on it as well as grass. Each plantain plant has a short stem with a circle of wide leaves. Outline how the size of the plantain population could be estimated using a quadrat method.

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