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IB Biology HL C4.1.3 Random Quadrat Sampling Questions

Place quadrats along transects, measure quadrat area and use representative counts to evaluate abundance, density and diversity of sessile organisms in IB Biology HL C4.1.3.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

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.

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

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

[Maximum number: 1]

White sage (Salvia apiana) is a native Californian shrub. Slender oat (Avena barbata) is a grass, originally from the Mediterranean, which was introduced to California. The map shows the distribution of the two species in relation to one another in an area near Santa Ynez, California.

Figure for Question IB Biology HL C4.1.3 Random Quadrat Sampling Questions question 1 — IB Biology HL

Using the scale bar, determine the area of quadrat A1, giving the units.

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