D2.3.4—Changes in plant tissue
Plant tissue changes mass in sucrose or salt solutions, allowing isotonic concentration to be estimated from zero percent change in experiments.
- Syllabus
- First assessment 2025
- Objective
- D2.3.4
- Level
- HL
Exam analysis
Chance of appearing3%of analysed past papers
Latest appearanceMay 2024
Most common paperPaper3
Typical marks1–3
Common command terms
- Identify
- Describe
- Explain
- Suggest
- Evaluate
- Outline
Scoring notes
- Common mistake
- Using raw mass change instead of percentage change when initial masses differ.
Recent exam appearances
May 2024Paper3 ["HL"] · TZ22(c)[ 2 ]D2.3.4—Changes in plant tissue
November 2019Paper3 ["HL"] · TZ03(c)[ 2 ]D2.3.4—Changes in plant tissue
November 2019Paper3 ["HL"] · TZ03(a)[ 1 ]D2.3.4—Changes in plant tissue
May 2018Paper3 ["HL"] · TZ11(b)[ 3 ]D2.3.4—Changes in plant tissue
Practice this objective
Coverage 2018–2024 · Updated 16 Jul 2026
Concept essentials
- Percentage change in mass shows relative water gain or loss.
- The isotonic concentration is where mass change is zero.
- Hypotonic solutions cause plant tissue to gain water.
- Controlled variables make osmolarity estimates more reliable.