IB Biology SL 3.1.7 Leaf Gas Exchange and Stomata Question Bank

Practise IB Biology SL 3.1.7 using exact SL questions tracing carbon dioxide through stomata, leaf air spaces and mesophyll to chloroplasts.

Exam points

Trace carbon dioxide through stomata, leaf air spaces and mesophyll to chloroplasts.
Identify guard cells and relate stomatal pores to controlled gas entry and exit.
Use a leaf diagram to connect stomata, air spaces and photosynthetic gas exchange.

[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 B3.1.7—Leaf gas exchange adaptations question 1 — IB Biology SL

On the image, label a guard cell.

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B3.1.7—Leaf gas exchange adaptations question 1