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IB Biology SL D2.3.5 Effects on Cells Without Wall Questions

Predict how wall-less animal cells respond to hypotonic and hypertonic solutions, and explain freshwater-protist contractile-vacuole control in IB Biology SL D2.3.5.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Predict water entry, swelling and lysis when a wall-less animal cell is placed in a hypotonic or distilled-water solution.
  • Infer hypertonic or hypotonic exposure from animal-cell morphology and explain water loss, shrinkage or crenation.
  • Explain how freshwater protists use contractile vacuoles to expel osmotic water and maintain internal water balance.

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Study D2.3.5—Effects on cells without wall conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology SL D2.3.5 Effects on Cells Without Wall Questions question 1

[Maximum number: 1]

Explain a change that would take place in sperm placed in a hypotonic solution.

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