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.

Exam points

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

[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 $600 \times$ .

Circular microscope field of leaf epidermis showing irregular interlocking cells, dark nuclei and several pairs of guard cells around elongated pores.

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

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IB Biology SL B3.1.10 Stomatal Density Questions question 1