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IB Biology HL 3.1.12 Bohr Shift Question Bank

Practise IB Biology HL 3.1.12 by interpreting oxygen dissociation curves and explaining how carbon dioxide and lower pH promote oxygen unloading.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Interpret Bohr-shift graphs: higher carbon dioxide lowers pH and moves the oxygen curve right.
  • Explain how reduced haemoglobin affinity increases oxygen unloading in respiring tissues during exercise.
  • Use curve data to link carbon dioxide, pH, affinity and oxygen delivery to tissues.

B3.1.12 (HL)—Bohr shift question 1

[Maximum number: 3]

Question (a)

(a)

The graph shows the oxygen dissociation curve for adult hemoglobin.

Figure for Question (a) — IB Biology HL
[ 3 ]

Question (i)

(i)

Using the graph, draw a line to show how the oxygen dissociation curve changes with the Bohr shift.

[ 1 ]

Question (ii)

(ii)

Explain the role of the Bohr shift during vigorous exercise.

[ 2 ]
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