D2.3.3—Osmosis into/out of cells
Osmosis into or out of cells depends on relative osmolarity, with isotonic conditions causing no net water movement across membranes.
- Syllabus
- First assessment 2025
- Objective
- D2.3.3
- Level
- SL
Exam analysis
Chance of appearing1%of analysed past papers
Latest appearanceMay 2023
Most common paperPaper3
Typical marks3
Common command terms
- Explain
Recent exam appearances
May 2023Paper3 ["SL"] · TZ12(e)[ 3 ]D2.3.3—Osmosis into/out of cells
Practice this objective
Coverage 2023–2023 · Updated 16 Jul 2026
Concept essentials
- Hypotonic external solutions cause net water entry into cells.
- Hypertonic external solutions cause net water loss from cells.
- Isotonic conditions produce no net osmosis.
- Animal tissues are maintained in matching osmolarity to preserve cell structure.