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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

  • Trace carbon dioxide through stomata, leaf air spaces and mesophyll to chloroplasts for photosynthesis.
  • 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.

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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