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IB Biology SL D2.3.2 Water Movement Questions

Analyse osmosis conditions and water movement across concentration gradients in IB Biology SL D2.3.2.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • State that osmosis requires a partially permeable membrane and a solute or water concentration gradient.
  • Explain that water moves through the membrane toward the solution with higher solute concentration.
  • Distinguish osmosis from evaporation by identifying membrane-mediated water movement in cells or tissues.

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Study D2.3.2—Water movement conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology SL D2.3.2 Water Movement Questions question 1

[Maximum number: 1]

A study was done on the osmolarity of semen and sperm movement (motility).

Figure for Question IB Biology SL D2.3.2 Water Movement Questions question 1 — IB Biology SL

The same study showed that blood plasma has a lower osmolarity than semen. Explain how that would affect the movement of water between blood plasma and semen.

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