IB Biology SL 3.1.10 Stomatal Density Question Bank

Practise IB Biology SL 3.1.10 using the exact SL evidence on counting stomata, field-of-view area and density estimation.

Exam points

Estimate stomatal density by counting stomata in a known field of view and dividing by its area.
Use image scale or field-of-view evidence to compare stomatal density between leaf samples.
Relate stomatal density measurements to potential gas exchange and water loss.

[Maximum number: 1]

The image shows a cast of the lower surface of a leaf from a busy Lizzie (Impatiens walleriana) plant as seen under a light microscope with a magnification of $600 \times$ .

Figure for Question B3.1.10—Stomatal density question 1 — IB Biology SL

Outline how stomatal density in busy Lizzie leaves can be estimated within a known field of view.

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B3.1.10—Stomatal density question 1