CourseCourseConceptConceptDocsDocuments

IB Biology HL D2.3 Water Potential Questions

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

Question 1

[Maximum number: 7]

Hydrogen bonds can exist both within and between molecules in living organisms and have an impact on their structure and function. Explain the importance of hydrogen bonding for living organisms.

Question 2

[Maximum number: 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

Question 3

[Maximum number: 1]

What would result from drinking large quantities of water?

Table for Question 3 — IB Biology HL
All question bank results loaded