0653.B3.1.03 — Describe the importance of diffusion of gases 4 Investigate the factors that influence diffusion, and solutes in living organisms limited to: past paper questions
Real questions on 0653.b3.1.03 — describe the importance of diffusion of gases 4 investigate the factors that influence diffusion, and solutes in living organisms limited to
The newest 9 of 9 written questions. Open one to see it on the real paper.
- 0653/41 · May/June 2025 · Q1b(i)[1]
Describe the trend in the number of deaths from heart disease between 1920 and 1960 shown in Fig. 1.1.
See it on the paper → - 0653/42 · February/March 2024 · Q7c[2]
A pregnant female is advised not to smoke tobacco. State one major toxic component of tobacco smoke and describe its effect on the gas exchange system. component effect
See it on the paper → - 0653/62 · May/June 2023 · Q1b(ii)[1]
Suggest why the distance between point A and point B is only an estimate of the diameter of the okra in Fig. 1.1.
See it on the paper → - 0653/61 · October/November 2022 · Q1a(ii)[2]
Fig. 1.2 shows the readings on the thermometer for the warm water and the cold water. warm water cold water °C °C 30 30 20 20 10 10 Fig. 1.2 Record in Table 1.1 the temperatures to the nearest 0.5 °C. Table 1.1 temperature / °C initial volume of gas / cm 3 final volume of gas / cm 3 volume of gas collected / cm 3 warm...
See it on the paper → - 0653/61 · October/November 2022 · Q1a(iii)[1]
As the yeast cells respire, the gas made collects in the syringe barrel. Fig. 1.3 shows the final volume of gas in the syringe barrel for the cold water experiment. 1.0 2.0 3.0 4.0 5.0 cm 3 Fig. 1.3 Record in Table 1.1 the final volume of gas in the syringe barrel.
See it on the paper → - 0653/61 · October/November 2022 · Q1a(iv)[1]
Calculate the volume of gas collected for the cold water experiment. Use the equation shown. volume of gas collected = final volume – initial volume Record this value in Table 1.1.
See it on the paper → - 0653/61 · October/November 2022 · Q1a(v)[1]
State the effect of temperature on the rate of respiration in yeast cells.
See it on the paper → - 0653/61 · October/November 2022 · Q1a(vi)[1]
The student observes that the warm water cools during the 5 minutes. Suggest what the student can do to reduce this cooling.
See it on the paper → - 0653/61 · October/November 2022 · Q1b(i)[3]
On the grid, plot a graph of volume of gas collected (y-axis) against temperature using the data in Table 1.2.
See it on the paper →
What examiners said
The trend in the graph was correctly stated by almost all candidates. A small number misinterpreted the question and wrote about causes of heart disease.
— Examiner report, May/June 2025, 0653/41 Q1(b)(i) (Cambridge)
Generally, this question was very well answered. Many candidates identified either carbon monoxide or tar as the toxic components affecting gaseous exchange. The reduced oxygen uptake by red blood cells caused by carbon monoxide was familiar to many candidates as was the damaging effect of tar on the lungs generally and the alveoli in particular. Candidates needed to specify that tar is associated...
— Examiner report, February/March 2024, 0653/42 Q7(c) (Cambridge)
This question proved to be demanding. Many candidates got the general idea, but they could not express it in a clear enough way. Descriptions needed to relate to this particular okra rather than okra in general. Many candidates suggested that the difficulty in measuring the diameter was because it was a photograph rather than an actual okra, whilst others thought the okra was still growing so the...
— Examiner report, May/June 2023, 0653/62 Q1(b)(ii) (Cambridge)
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