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IB Biology SL B3.1.10 Stomatal Density Questions

Explore how leaf casts or micrographs allow stomata to be counted per unit area and compared between samples in IB Biology SL B3.1.10.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Estimate stomatal density by counting stomata in a known field of view and dividing by its area.

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Study B3.1.10—Stomatal density conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology SL B3.1.10 Stomatal Density Questions question 1

[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 600×600 \times.

Figure for Question IB Biology SL B3.1.10 Stomatal Density Questions 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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