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
- HL
Exam analysis
Chance of appearing1%of analysed past papers
Latest appearanceNovember 2017
Most common paperPaper1
Typical marks1
Common command terms
- Outline
Recent exam appearances
November 2017Paper1 ["HL"] · TZ034[ 1 ]B3.1.10—Stomatal density
Practice this objective
Coverage 2017–2017 · 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.