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IB Biology SL 2.4.2 Osmosis and water potential Question Bank

Practise IB Biology SL 2.4.2 by explaining how solute concentration drives osmosis across membranes.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • State the conditions needed for osmosis.
  • Explain the direction of water movement using solute concentration or osmolarity.

D2.3.2—Water movement question 1

[Maximum number: 1]

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

Figure for Question D2.3.2—Water movement 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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