1 (a) Scientists measure the length of sperm cells from different animals. The animals are placed in size from animal A the smallest to animal F the largest. Fig. 1.1 shows the results. 0 0.02 A B C D animal E F 0.04 0.06 0.08 length of sperm cell / mm 0.10 0.12 0.16 0.18 0.20 0.14 Fig. 1.1 (i) Using Fig. 1.1, state the length of a sperm cell in animal B. … mm [1] (ii) State the animal with the shortest length of sperm. … [1] (iii) State evidence from Fig. 1.1 that shows that length of sperm does not increase with size of animal. … … [1] (b) Plant and animal cells both contain a nucleus. Name two other structures seen in both plant and animal cells. 1 … 2 … [2] (c) The boxes on the left show some of the parts of a plant cell. The boxes on the right show the functions of the parts. Draw lines to link each part with its function. part of plant cell function cell wall contains genetic material chloroplast contains cell sap and supports the cell nucleus site of photosynthesis vacuole strengthens the cell [3] (d) Substances enter and leave cells. Name the process by which substances enter the cells. … [1] (e) Explain why muscle cells need high rates of respiration. … … … … [2] [Total: 11]

1(a)(i) 0.12 (mm) ; 1 1(a)(ii) A ; 1 1(a)(iii) animal F is the biggest but does not have the longest length of sperm / animal D has the longest sperm but is not the biggest animal / avp ; 1 1(b) any two from: cell membrane ; cytoplasm ; AVP ; e.g. ribosomes / mitochondria 2 1(c) cell wall contains genetic material chloroplast contains cell sap and supports the cell nucleus site of photosynthesis vacuole strengthens the cell ;;; 3 1(d) diffusion ; 1 1(e) respiration releases energy ; (energy is required) for muscle contraction / movement ; 2

10 Fig. 10.1 is a diagram showing part of the carbon cycle. carbon dioxide in the atmosphere dead organisms fossil fuels X industry decomposition photosynthesis Fig. 10.1 (a) Name the process occurring at X in Fig. 10.1. … [1] (b) When deforestation occurs there is a build-up of carbon dioxide in the atmosphere. (i) List two other negative effects of deforestation. 1 … 2 … [2] (ii) Stopping deforestation will reduce the build-up of carbon dioxide in the atmosphere. Use the information in Fig. 10.1 to suggest two other ways we can reduce the build-up of carbon dioxide in the atmosphere. 1 … … 2 … … [2] (c) Table 10.1 shows some features of respiration and photosynthesis. Place ticks (3) in the boxes to show the features of each process. Table 10.1 process produces carbon dioxide produces oxygen requires light energy produces carbohydrates photosynthesis respiration [4] (d) Water is one of the substances required by plants and is also lost by plants during transpiration. (i) State the name of the vessels that transport water through a plant. … [1] (ii) Complete the sentences to define the term transpiration. Transpiration is loss of water vapour from plant … by evaporation of water at the surfaces of the mesophyll … followed by diffusion of water vapour through the … [3] [Total: 13]

10(a) fossilisation ; 1 10(b)(i) any two from: habitat destruction ; extinction ; loss of soil ; flooding ; AVP ; 2 10(b)(ii) replant / plant more trees ; reduce, combustion of fossil fuels / emissions by industry ; 2 10(c)     ;;;; 4 10(d)(i) xylem ; 1 10(d)(ii) leaves ; cells ; stomata ; 3 (a) This mark is awarded for correctly naming 'fossilisation' as the process occurring at X. (b)(i) You need to list any two negative effects of deforestation, such as habitat destruction, extinction, loss of soil, or flooding. (b)(ii) You must suggest two ways to reduce carbon dioxide build-up, such as replanting/planting more trees or reducing the combustion of fossil fuels/emissions by industry. (c) You earn these marks by correctly ticking all four boxes. (d)(i) This mark is awarded for correctly identifying 'xylem'. (d)(ii) You need to identify 'leaves', 'cells', and 'stomata' as the parts involved.

1 (a) Table 1.1 shows some features of aerobic and anaerobic respiration. Place ticks (3) in the boxes to show all the correct features for each type of respiration. Table 1.1 type of respiration oxygen is a reactant glucose is a reactant lactic acid is a product carbon dioxide is a product aerobic anaerobic respiration in muscles anaerobic respiration in yeast [4] (b) State one industrial use of anaerobic respiration in yeast. … [1] (c) Describe one disadvantage of anaerobic respiration in terms of energy release. … … [1] [Total: 6]

1(a) type of respiration oxygen is a reactant glucose is a reactant lactic acid is a product carbon dioxide is a product aerobic    anaerobic respiration in muscles   anaerobic respiration in yeast   ;;;; 4 1(b) bread making / AVP ; 1 1(c) less energy is released per glucose molecule than aerobic respiration ; 1

4 (a) Anaerobic respiration in yeast produces carbon dioxide. A scientist investigates the effect of using different types of sugar on the volume of carbon dioxide produced by yeast in one minute. The results are shown in Fig. 4.1. 25 20 15 10 5 0 volume of carbon dioxide produced / cm3 fructose glucose lactose type of sugar sucrose Fig. 4.1 (i) Compare the results for the different types of sugar. Include comparative data from Fig. 4.1 in your answer. … … … … … … [3] (ii) State one other product of anaerobic respiration in yeast. … [1] (iii) State the word equation for the anaerobic respiration in muscles. … [2] (b) Carbon dioxide produced by yeast causes bread to rise. The temperature used during bread-making is carefully controlled. At very high temperatures no carbon dioxide is produced. Explain why. Use ideas about enzymes in your answer. … … … … [2] [Total: 8]

4(a)(i) any two from: glucose produces the most carbon dioxide ; fructose produces the least carbon dioxide ; sucrose / lactose, produce more carbon dioxide than fructose or sucrose / lactose, produce less carbon dioxide than glucose ; plus comparative data quote with correct units / comparative data manipulation ; 3 4(a)(ii) alcohol ; 1 4(a)(iii) glucose → lactic acid ;; 2 4(b) enzymes denatured ; shape of the active site being changed / enzyme and substrate are no longer complementary / substrate can no longer fit into active site ; 2

Cambridge IGCSE Co-ordinated Sciences · 0654

IGCSE Co-ordinated Sciences (0654) Respiration past paper questions

Revise IGCSE Co-ordinated Sciences (0654) — Respiration with real Cambridge past-paper questions grouped by topic, each shown with its marking scheme. Working one topic at a time targets exactly the skill each question tests.

99 free questions from 2016–2021, each with its marking scheme. Open the full topical bank to filter by subtopic, paper, and year.

Respiration in IGCSE Co-ordinated Sciences 0654 exams, 2020–2025

Across 2020–2025, Respiration accounted for 113 questions worth 643 marks in Cambridge IGCSE Co-ordinated Sciences (0654) papers.

By year
Year	Questions	Marks
2020	15	54
2021	20	95
2022	20	128
2023	26	147
2024	15	106
2025	17	113

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B12.1 Respiration589 marks

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Paper 1 · 25 qs
Paper 2 · 29 qs
Paper 3 · 18 qs
Paper 4 · 21 qs
Paper 5 · 8 qs
Paper 6 · 12 qs

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2021 Oct/Nov · Paper 3 · Q1 · 11 marks
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2021 Oct/Nov · Paper 3 · Q10 · 13 marks
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2021 May/Jun · Paper 4 · Q1 · 6 marks
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2021 May/Jun · Paper 4 · Q4 · 8 marks
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2021 May/Jun · Paper 1 · Q1 · 1 mark
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Mark scheme — 2021 Paper 1 Q1
Answer: D
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