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IB Biology HL 2.4.5 Osmosis, haemolysis and cell damage Question Bank

Practise IB Biology HL 2.4.5 by analysing osmotic effects on red blood cells and other animal cells.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Interpret red-cell images and salt-concentration data to identify osmotic damage.
  • Explain haemolysis and cell responses in hypotonic solutions.

D2.3.5—Effects on cells without wall question 1

[Maximum number: 2]

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.

Figure for Question D2.3.5—Effects on cells without wall question 1 — IB Biology HL

Outline the effect of the venom on the hemolysis of red blood cells.

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