IB Biology HL C4.1.3 Random Quadrat Sampling Questions

Place quadrats at randomly selected coordinates, record the target sessile organisms within each known-area sample, and use the counts to describe abundance or estimate population size across a habitat.

Exam points

Choose quadrat locations using random coordinates, then count the target sessile organisms in a known quadrat area.
Use counts from known-area quadrats and the total habitat area to estimate organism abundance or population size.

[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.

$9.0 \mathrm{~m}^{2} / 9 \mathrm{~m}^{2}$

Units required for the mark.

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