O-LevelBiologyRespiration5090/11 · May/June 2014 · Q171 Mark

The diagram shows an alveolus and an associated blood capillary. At which point will the greatest rate of diffusion of carbon dioxide occur? [Figure 17.1]

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

APoint A, indicating blood flow into the capillary

BPoint B, indicating air in the alveolus

CPoint C, indicating a red blood cell

DPoint D, indicating the thin wall between capillary and alveolus where gas exchange happens

✓ Correct answer

D: Point D, indicating the thin wall between capillary and alveolus where gas exchange happens

Oracle Prep sorts past-paper questions by topic, so you can drill Respiration and see which topics are most likely to come up next.

Topic: Respiration, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2014 Paper 1 Variant 1, question 17.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content