B3.1.10—Stomatal density
Stomatal density measures stomata per unit leaf area and helps compare potential gas exchange and water loss between leaf surfaces.
- Syllabus
- First assessment 2025
- Objective
- B3.1.10
- Level
- SL
Exam analysis
Chance of appearing1%of analysed past papers
Latest appearanceMay 2025
Most common paperPaper1B
Typical marks1
Common command terms
- Outline
Recent exam appearances
May 2025Paper1B ["SL"] · TZ11(c)(i)[ 1 ]B3.1.10—Stomatal density
Practice this objective
Coverage 2025–2025 · Updated 15 Jul 2026
Concept essentials
- Stomatal density is calculated as the number of stomata divided by leaf area observed.
- More stomata on a surface can indicate greater potential transpiration from that surface.
- A known field of view or calibrated image is needed for a valid density estimate.
- Density comparisons are meaningful only when the same area basis is used.