1 (a) A student measures their pulse rate at rest, during and after exercise. Fig. 1.1 shows the results. 0 0 5 10 15 20 25 time / minutes 30 35 40 45 50 60 70 80 90 pulse rate / beats per minute 100 110 120 at rest during exercise after exercise at rest during exercise after exercise Fig. 1.1 (i) Calculate the difference in pulse rate between the pulse rate at rest and the maximum pulse rate of the student. pulse rate at rest … beats per minute maximum pulse rate … beats per minute difference … beats per minute [2] (ii) Calculate the length of time taken for the student’s pulse rate to return to the resting value once exercise had stopped. … min [1] (b) Fig. 1.2 is a photomicrograph of a cross section of a human vein. Fig. 1.2 (i) Name a structure present in veins but not visible in Fig. 1.2. … [1] (ii) Describe two ways in which the structure of arteries is different from the vein shown in Fig. 1.2. 1 … … 2 … … [2] (iii) Describe the function of capillaries. … … [1] (c) Table 1.1 shows some blood vessels and some organs. Place ticks (3) in the boxes to show which blood vessels transport blood to these organs. One row has been done for you. Table 1.1 organ heart kidney lung coronary artery pulmonary artery renal artery vena cava 3 [3] (d) List two of the main components of blood. 1 … 2 … [2] [Total: 12]

1(a)(i) pulse rate at rest = 72 (bpm) and maximum pulse rate = 115 (bpm) ; (115 – 72) = 43 (bpm) ; 2 1(a)(ii) 20 (mins) ; 1 1(b)(i) valves ; 1 1(b)(ii) any two from: thicker wall ; muscle / elastic fibres ; no valves ; narrower lumen ; 2 1(b)(iii) transfer of (named) substances (to / from, tissues / cells) ; 1 1(c) heart kidney lung coronary artery  pulmonary artery  renal artery  vena cava  ;;; 3 1(d) any two from: red blood cells ; white blood cells ; plasma ; platelets ; 2

4 (a) Human immunodeficiency virus (HIV) is a sexually transmitted infection. The number of new HIV infections in one country was monitored. The results are shown in Fig. 4.1. 0 1000 1999 2000 2001 2002 2003 2004 year 2005 2006 2007 2008 2009 2000 3000 4000 number of new HIV infections 5000 6000 7000 8000 Fig. 4.1 The number of new infections has decreased since 2002. (i) Calculate the difference in number of new HIV infections between 2002 and 2009. … [1] (ii) Suggest two reasons why the number of new HIV infections has decreased since 2002. 1 … … 2 … … [2] (iii) Place a tick (3) in the box to show one way HIV can be transmitted. holding hands sharing cooking utensils through breast milk genetically inherited [1] (b) HIV infects white blood cells. Fig. 4.2 shows a photomicrograph of some blood. A white blood cell can be seen in the centre. X Fig. 4.2 (i) Name the part of the white blood cell labelled X in Fig. 4.2. … [1] (ii) Name the other type of cells visible in Fig. 4.2. … [1] (iii) State two functions of white blood cells. 1 … 2 … [2] (iv) Name the part of the blood that transports hormones. … [1] [Total: 9]

4(a)(i) 7000 – 3100 = 3900 ; 1 4(a)(ii) any two from: use of condoms / femidoms ; screening blood transfusions ; education ; use of clean needles / needle exchange programmes ; regular HIV testing ; preventative medication ; AVP ; e.g. practise of abstinence 2 4(a)(iii) through breast milk ticked ; 1 4(b)(i) nucleus ; 1 4(b)(ii) red blood cell ; 1 4(b)(iii) phagocytosis ; antibody production ; 2 4(b)(iv) plasma ; 1

4 (a) Fig. 4.1 is a diagram of the heart. A B C E D Fig. 4.1 (i) Identify the parts labelled B, C and D in Fig. 4.1. B … C … D … [3] (ii) Describe the function of the structure labelled E. … … [1] (iii) The blood vessel labelled A is an artery. Describe the role of arteries in the circulatory system. … … [1] (b) Name two of the main components of blood. 1 … 2 … [2] (c) A student measures their heart rate over a 24‑hour period. Fig. 4.2 shows a graph of the results. 00:00 02:00 04:00 06:00 08:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 24:00 midnight midday time of day / hours midnight 60 80 100 120 140 160 180 200 heart rate / bpm Fig. 4.2 (i) Calculate the difference in heart rate between the minimum and maximum heart rate seen in Fig. 4.2. …bpm [1] (ii) At 10:00 hours the student attends a fitness class. Estimate the length of time of the fitness class. …hours [1] (iii) At 18:00 hours the student was scared by a snake. Describe and explain the result seen at 18:00 hours in Fig. 4.2. Use ideas about hormones in your answer. … … … … [2] [Total: 11]

4(a)(i) septum ; muscle / muscle wall ; ventricles ; 3 4(a)(ii) ensure one-way flow of blood ; 1 4(a)(iii) transport blood away from the heart ; 1 4(b) any two from red (blood) cells ; white (blood) cells ; platelets ; plasma ; max 2 2 4(c)(i) 110 (bpm) ; 1 4(c)(ii) 4 (hours) ; 1 4(c)(iii) (rapid) increase of heart rate / increase by 70 bpm / increase to 140 bpm ; ref to adrenaline ; 2

4 (a) Fig. 4.1 is a diagram of the heart. A B C E D Fig. 4.1 (i) Identify the parts labelled B, C and D in Fig. 4.1. B … C … D … [3] (ii) Describe the function of the structure labelled E. … … [1] (iii) The blood vessel labelled A is an artery. Describe the role of arteries in the circulatory system. … … [1] (b) Name two of the main components of blood. 1 … 2 … [2] (c) A student measures their heart rate over a 24‑hour period. Fig. 4.2 shows a graph of the results. 00:00 02:00 04:00 06:00 08:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 24:00 midnight midday time of day / hours midnight 60 80 100 120 140 160 180 200 heart rate / bpm Fig. 4.2 (i) Calculate the difference in heart rate between the minimum and maximum heart rate seen in Fig. 4.2. …bpm [1] (ii) At 10:00 hours the student attends a fitness class. Estimate the length of time of the fitness class. …hours [1] (iii) At 18:00 hours the student was scared by a snake. Describe and explain the result seen at 18:00 hours in Fig. 4.2. Use ideas about hormones in your answer. … … … … [2] [Total: 11]

4(a)(i) septum ; muscle / muscle wall ; ventricles ; 3 4(a)(ii) ensure one-way flow of blood ; 1 4(a)(iii) transport blood away from the heart ; 1 4(b) any two from red (blood) cells ; white (blood) cells ; platelets ; plasma ; max 2 2 4(c)(i) 110 (bpm) ; 1 4(c)(ii) 4 (hours) ; 1 4(c)(iii) (rapid) increase of heart rate / increase by 70 bpm / increase to 140 bpm ; ref to adrenaline ; 2

Cambridge IGCSE Co-ordinated Sciences · 0654

IGCSE Co-ordinated Sciences (0654) Transport in animals past paper questions

Revise IGCSE Co-ordinated Sciences (0654) — Transport in animals 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.

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

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

Across 2020–2025, Transport in animals accounted for 98 questions worth 639 marks in Cambridge IGCSE Co-ordinated Sciences (0654) papers.

By year
Year	Questions	Marks
2020	11	65
2021	14	95
2022	17	149
2023	14	96
2024	18	126
2025	24	108

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Paper 2 · 21 qs
Paper 3 · 29 qs
Paper 4 · 27 qs
Paper 6 · 2 qs

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2021 Oct/Nov · Paper 3 · Q1 · 12 marks
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2021 Feb/Mar · Paper 3 · Q4 · 9 marks
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2021 May/Jun · Paper 3 · Q4 · 11 marks
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2021 May/Jun · Paper 3 · Q4 · 11 marks
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2021 Oct/Nov · Paper 1 · Q7 · 1 mark
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Mark scheme — 2021 Paper 1 Q7
Answer: D
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