The newest 11 of 11 written questions. Open one to see it on the real paper.
State the name of solution Y.
See it on the paper →Explain why solution Y turns milky in test-tube B only.
See it on the paper →Suggest how a lack of haemoglobin in red blood cells would affect aerobic respiration.
See it on the paper →Calculate the difference in composition of the carbon dioxide in Table 2.1. Write your answer in Table 2.1.
See it on the paper →What were the results after 10 breaths?
See it on the paper →Calculate the difference between the percentage of gas X in inspired air compared to expired air in Table 10.1. %
See it on the paper →Describe the test for gas Y and state the positive result. test positive result
See it on the paper →Place ticks (3) to show two other diseases caused by smoking. chronic obstructive pulmonary disease (COPD) coronary heart disease kwashiorkor marasmus scurvy
See it on the paper →Comprehensive responses • Some candidates correctly described how a lack of haemoglobin affected aerobic respiration. Limited responses • Some candidates could not make the connection between lack of haemoglobin and less oxygen transport.
— Examiner report, February/March 2026, 0654/32 Q2(b)(iii) (Cambridge)
The majority of candidates could calculate the difference in carbon dioxide percentage between inspired and expired air.
— Examiner report, May/June 2025, 0654/42 Q2(c)(i) (Cambridge)
The most popular and also correct response was 5%. Incorrect answers were 23.8 and 20.96.
— Examiner report, February/March 2024, 0654/32 Q10(b)(i) (Cambridge)
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State the name of the component in tobacco smoke that causes cancer.
Exercise increases the rate of breathing. Describe one other effect of exercise on the pattern of breathing.
See it on the paper →An increase in the concentration levels of one gas in the blood causes the increase in breathing rate. Name this gas.
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