IB Biology HL D2.3 Water Potential Question Bank
Practise IB Biology HL D2.3 by explaining osmosis, calculating water potential and interpreting plant and animal cell experiments.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- explain osmosis across a partially permeable membrane using solute concentration differences
- deduce cell changes such as plasmolysis, crenation or lysis in hypertonic and hypotonic media
- calculate water potential from solute and pressure potential or interpret zero mass-change graphs
Covered syllabus points
D2.3.1—Solvation with waterD2.3.2—Water movementD2.3.3—Osmosis into/out of cellsD2.3.4—Changes in plant tissueD2.3.5—Effects on cells without wallD2.3.6—Effects on cells with wallD2.3.7—Medical applicationsD2.3.8 (HL)—Water potentialD2.3.9 (HL)—Movement from higher to lower potentialD2.3.10 (HL)—Solute and pressure potentialD2.3.11 (HL)—Water potential in plant tissue
D2.3 Water potential question 1
Excessive irrigation can cause increased salinity in the soil. What effect does this have on water transport in the plant roots?
A
Decreases movement of water from soil into the root
B
Absorption of water with a higher solute concentration
C
Increases movement of water from soil into the root
D
Absorption of water with a lower solute concentration
D2.3 Water potential question 2
What would result from drinking large quantities of water?
D2.3 Water potential question 3
Data was collected on rabbit red blood cells that were exposed to sodium chloride (NaCl) and scorpion venom. Under some osmotic conditions red blood cells swell and burst, releasing hemoglobin (hemolysis). The graph shows the response of red blood cells to different concentrations of sodium chloride, with and without scorpion venom.
Question (a)
(a)
Outline the effect of the venom on the hemolysis of red blood cells.
[ 2 ]
Question (b)
(b)
Describe how the variables would be controlled in an experiment to estimate the osmolarity of plant tissue.
[ 3 ]
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