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IB Biology SL B3.1.7 Leaf Gas Exchange Adaptations Questions

Explore how stomata, guard cells, air spaces and mesophyll regulate photosynthetic gas exchange in leaves in IB Biology SL B3.1.7.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Outline the route of carbon dioxide from stomata through air spaces and mesophyll to chloroplasts.
  • Identify guard cells on a leaf-surface micrograph.

IB Biology SL B3.1.7 Leaf Gas Exchange Adaptations 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 B3.1.7 Leaf Gas Exchange Adaptations Questions question 1 — IB Biology SL

On the image, label a guard cell.

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