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IB Biology HL 4.1.3 Transects, quadrats and population estimates Question Bank

Practise IB Biology HL 4.1.3 by evaluating transect and quadrat evidence to estimate abundance and distribution.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Calculate quadrat area or population estimates from field measurements.
  • Evaluate how transects and quadrats affect reliability of ecological sampling.

C4.1.3—Random quadrat sampling 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 C4.1.3—Random quadrat sampling question 1 — IB Biology HL

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

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