Cambridge IGCSE Sciences - Co-ordinated (Double) 0654 — 2021 Oct/Nov Paper 2 · Variant 2
0654/22/O/N/21 · 40 questions · 40 marks · ≈45 min
The question paper and its mark scheme, free to read here and free to download. This is Cambridge’s own paper, exactly as it was sat.
Question paper16 pages
Mark scheme3 pages
Answers below. Sit the paper first if you are practising.
Questions as text
Q1 · Which processes do green plants carry out?
1 Which processes do green plants carry out? 1 detect stimuli and make appropriate responses 2 break down nutrient molecules to release energy for metabolism 3 take in carbon dioxide, water and ions for energy, growth and development A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3
Mark scheme: D
Q2 · The diagram shows a plant cell as seen under a light microscope
2 The diagram shows a plant cell as seen under a light microscope. Which structure is also found in animal cells? B A C D
Mark scheme: A
Q3 · Which molecule contains carbon?
3 Which molecule contains carbon? A ammonia B fat C sulfuric acid D water
Mark scheme: B
Q4 · The graph shows the effect of temperature on an enzyme’s activity
4 The graph shows the effect of temperature on an enzyme’s activity. rate of enzyme activity temperature The three statements describe what is happening at different positions on the graph. What is the correct order for the statements as the temperature increases? 1 The maximum frequency of effective collisions is happening. 2 The enzyme is denatured. 3 Kinetic energy of the molecules increases so the rate of reaction increases. A 1 2 3 B 1 3 2 C 2 3 1 D 3 1 2
Mark scheme: D
Q5 · What will cause plant leaves to turn yellow?
5 What will cause plant leaves to turn yellow? A a lack of magnesium in the soil B a lack of starch in the leaves C a reduction in the rate of photosynthesis D a reduction in the rate of respiration
Mark scheme: A
Q6 · What is the name of the process which moves soluble food molecules through the wall of…
6 What is the name of the process which moves soluble food molecules through the wall of the small intestine into the blood? A absorption B assimilation C digestion D ingestion
Mark scheme: A
Q7 · Which statement correctly describes the opening and closing of the valves in the heart…
7 Which statement correctly describes the opening and closing of the valves in the heart during contraction of the ventricles? A The atrioventricular valves close and the semi-lunar valves close. B The atrioventricular valves close and the semi-lunar valves open. C The atrioventricular valves open and the semi-lunar valves close. D The atrioventricular valves open and the semi-lunar valves open.
Mark scheme: B
Q8 · The graph shows the changes in volume of air in the lungs at rest and during exercise
8 The graph shows the changes in volume of air in the lungs at rest and during exercise. 6 exercise 5 4 rest volume of air in 3 lungs / dm3 2 1 0 time What was the effect of exercise on the rate and depth of breathing? rate of breathing depth of breathing A decrease decrease B decrease increase C increase decrease D increase increase
Mark scheme: D
Q9 · Adrenaline increases blood glucose concentration
9 Adrenaline increases blood glucose concentration. It does this by changing the levels of glucagon and insulin. Which row is correct? adrenaline level glucagon level insulin level A decrease decrease decrease B decrease increase decrease C increase increase increase D increase increase decrease
Mark scheme: D
Q10 · Which row describes the exchange of substances between a mother and her fetus in mammals?
10 Which row describes the exchange of substances between a mother and her fetus in mammals? substances moving from substances moving from the mother to fetus the fetus to mother A glucose and carbon dioxide urea and oxygen B glucose and oxygen urea and carbon dioxide C urea and carbon dioxide glucose and oxygen D urea and oxygen glucose and carbon dioxide
Mark scheme: B
Q11 · The pedigree diagram shows inheritance of a disease caused by a dominant allele
11 The pedigree diagram shows inheritance of a disease caused by a dominant allele. 1 key affected male 2 3 unaffected male affected female 4 unaffected female Which statement is correct? A Individual 1 is homozygous dominant. B Individual 2 is homozygous dominant. C Individual 3 is homozygous recessive. D Individual 4 is heterozygous.
Mark scheme: C
Q12 · What is an ecosystem?
12 What is an ecosystem? A a chart showing the flow of energy from one organism to another B a diagram giving the energy level of an organism in its environment C a network of interconnected organisms D a unit containing all of the organisms and their environment
Mark scheme: D
Q13 · The diagram shows a simplified carbon cycle
13 The diagram shows a simplified carbon cycle. Which labelled arrow represents respiration? CO2 B C A green D animals plants fossil fuels
Mark scheme: C
Q14 · Which row correctly identifies the named changes?
14 Which row correctly identifies the named changes? physical changes chemical changes A condensation and combustion evaporation and neutralisation B evaporation and neutralisation condensation and combustion C condensation and evaporation combustion and neutralisation D combustion and neutralisation condensation and evaporation
Mark scheme: C
Q15 · Which statements explain why graphite conducts electricity and why it can act as a…
15 Which statements explain why graphite conducts electricity and why it can act as a lubricant? 1 It is a macromolecule. 2 It has mobile electrons. 3 It has strong covalent bonds. 4 It has weak forces between its layers. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4
Mark scheme: D
Q16 · When aqueous chlorine is added to aqueous potassium bromide, bromine is produced
16 When aqueous chlorine is added to aqueous potassium bromide, bromine is produced. What is the ionic equation for this reaction? A Cl 2 + Br – 2Cl – + Br B Cl 2 + 2Br – 2Cl – + Br2 C Cl 2 + 2Br – Cl – + Br2 D Cl 2 + 2KBr 2KCl + Br2
Mark scheme: B
Q17 · The diagram shows the electrolysis of a compound
17 The diagram shows the electrolysis of a compound. switch + – P Q electrolyte When the switch is closed, the solution around electrode P turns orange because a halogen is formed. The positive electrode P is called the ……1……, and the halogen is ……2…… . Which words complete gaps 1 and 2? 1 2 A anode bromine B anode chlorine C cathode bromine D cathode chlorine
Mark scheme: A
Q18 · Calcium carbonate reacts with dilute hydrochloric acid
18 Calcium carbonate reacts with dilute hydrochloric acid. The equation for this reaction is shown. CaCO3 + 2HCl CaCl 2 + H2O + CO2 Three methods for investigating rates of reaction are listed. 1 observing a colour change 2 measuring gas volume 3 measuring mass Which methods are suitable for investigating the rate of this reaction? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only
Mark scheme: D
Q19 · Which equation shows a reaction in which a metal is reduced?
19 Which equation shows a reaction in which a metal is reduced? A CuCO3 CuO + CO2 B 2Li + 2H2O 2LiOH + H2 C 2Fe3+ + 2I – Fe2+ + I2 D Mg + 2H+ Mg2+ + H2
Mark scheme: C
Q20 · Zinc oxide reacts with both dilute sulfuric acid and aqueous sodium hydroxide
20 Zinc oxide reacts with both dilute sulfuric acid and aqueous sodium hydroxide. Which type of oxide is zinc oxide? A acidic B amphoteric C basic D neutral
Mark scheme: B
Q21 · Some properties of different metals are shown
21 Some properties of different metals are shown. density colour of compound melting point / C g / cm3 formed by the metal 1 1.54 851 white 2 8.91 1455 green 3 5.80 1890 lilac 4 11.3 328 white Which metals are transition elements? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4
Mark scheme: C
Q22 · Why does the steel used to make a drill contain manganese?
22 Why does the steel used to make a drill contain manganese? A to increase the density of the steel B to increase the hardness of the steel C to increase the malleability of the steel D to increase the melting point of the steel
Mark scheme: B
Q23 · A block of zinc is attached to an underground steel pipe as shown
23 A block of zinc is attached to an underground steel pipe as shown. zinc block steel pipe The zinc stops the steel rusting by sacrificial protection. Which statement is not correct? A Zinc is more reactive than the iron in steel. B Zinc is oxidised in preference to the iron in steel. C Zinc prevents oxygen from reaching the steel. D Zinc transfers electrons to the iron in the steel.
Mark scheme: C
Q24 · Ammonia is manufactured by the Haber process from nitrogen and hydrogen
24 Ammonia is manufactured by the Haber process from nitrogen and hydrogen. What is the source of hydrogen for this process? A the electrolysis of dilute sulfuric acid B the fractional distillation of liquid air C the reaction of an acid with a reactive metal D the reaction of steam with natural gas
Mark scheme: D
Q25 · Sulfuric acid is manufactured by the Contact process
25 Sulfuric acid is manufactured by the Contact process. Which reaction in this process uses a catalyst? A S + O2 SO2 B 2SO2 + O2 2SO3 C SO3 + H2SO4 H2S2O7 D H2S2O7 + H2O 2H2SO4
Mark scheme: B
Q26 · Which compound is used to neutralise acidic gases?
26 Which compound is used to neutralise acidic gases? A calcium carbonate B calcium chloride C calcium phosphate D calcium sulfate
Mark scheme: A
More questions on The characteristic properties of acids and bases
Q27 · Four molecules are shown
27 Four molecules are shown. Which structure represents ethanol? A B C D H H H H H H H H H H C C OH H C C C OH C C H C C H H H H H H H OH H H
Mark scheme: A
Q28 · A rubber band and a copper wire are each stretched by hanging a load on one end
28 A rubber band and a copper wire are each stretched by hanging a load on one end. At first, both obey Hooke’s Law. When the rubber band reaches its limit of proportionality it becomes more difficult to stretch. When the copper wire reaches its limit of proportionality it becomes easier to stretch. Which two graphs are the extension–load graphs for the rubber band and the copper wire? extension extension 0 0 0 load 0 load graph 1 graph 2 extension extension 0 0 0 load 0 load graph 3 graph 4 rubber band copper wire A graph 1 graph 3 B graph 2 graph 4 C graph 3 graph 1 D graph 4 graph 2
Mark scheme: B
Q29 · What is meant by the moment of a force?
29 What is meant by the moment of a force? A the speed of an object moved by a force B the time taken for a force to move an object C the turning effect of a force D the work done by a force
Mark scheme: C
Q30 · What cannot be used as a unit for pressure?
30 What cannot be used as a unit for pressure? A N / m2 B N / cm2 C Pa D Pa / m2
Mark scheme: D
Q31 · A stone falls from a bench
31 A stone falls from a bench. Which row describes how the gravitational potential energy and the kinetic energy of the stone change as it falls? gravitational kinetic energy potential energy A decreases increases B decreases stays the same C increases decreases D increases stays the same
Mark scheme: A
Q32 · A lamp transfers 20 J of electrical energy into 12 J of useful light energy
32 A lamp transfers 20 J of electrical energy into 12 J of useful light energy. What is the efficiency of the lamp? A 33% B 40% C 60% D 66%
Mark scheme: C
Q33 · Which labelled arrow on the diagram represents condensation?
33 Which labelled arrow on the diagram represents condensation? A liquid gas B C D solid
Mark scheme: A
Q34 · The diagrams show four liquid-in-glass thermometers, all drawn to the same scale
34 The diagrams show four liquid-in-glass thermometers, all drawn to the same scale. Which thermometer has the greatest sensitivity? A B C D
Mark scheme: B
Q35 · The diagram shows a ray of light striking a plane mirror
35 The diagram shows a ray of light striking a plane mirror. ray of light 20° plane mirror What is the angle of reflection? A 20 B 40 C 70 D 90
Mark scheme: C
Q36 · Light is travelling in a glass block
36 Light is travelling in a glass block. The light reaches the edge of the block. The angle of incidence at the edge is much less than the critical angle. What happens to the light? A All of the light emerges into the air. B All of the light is reflected back into the block. C Some of the light emerges into the air and some is reflected back into the block. D Some of the light is reflected back into the block and some travels along the edge of the block.
Mark scheme: C
Q37 · The diagram represents a wave in air
37 The diagram represents a wave in air. Molecules are closer together in region P than they are in region Q. region P region Q wave direction Which type of wave is represented, and in which direction do the molecules vibrate? direction type of wave of vibration A longitudinal B longitudinal C transverse D transverse
Mark scheme: A
Q38 · A rod is rubbed with a dry piece of cloth
38 A rod is rubbed with a dry piece of cloth. A scientist holds the rod in her hand and brings it close to a negatively charged plastic strip. The strip is suspended by an insulating thread. As the rod approaches the plastic strip, the strip moves towards the rod. insulating thread charged plastic – – – – – –– strip – – – – – – – – – – – – strip moves – towards rod hand rod Which statement is correct? A The rod is a negatively charged electrical conductor. B The rod is a negatively charged electrical insulator. C The rod is a positively charged electrical conductor. D The rod is a positively charged electrical insulator.
Mark scheme: D
Q39 · The diagram shows a wire carrying an electric current in the direction shown
39 The diagram shows a wire carrying an electric current in the direction shown. The wire is at right angles to a magnetic field that is directed into the page. A force acts on the wire because of the current and the magnetic field. In which labelled direction does this force act? wire carrying current A D B C magnetic field into page
Mark scheme: B
Q40 · The nuclide 14 6C decays into the nuclide 14 7N by emitting a -particle
40 The nuclide 14 6C decays into the nuclide 14 7N by emitting a -particle. Which equation shows this decay? A 14 6C 14 7N + 0 1 B 14 6C 14 7N + 0 1 C 14 6C 14 7N + 4 2 D 14 6C 14 7N + 4 2
Mark scheme: A
What was in this paper
The subtopics covered by these 40 questions, and how many questions each got. Open one in a new tab to see every Cambridge question on it.
2Forces2Light2Rate of reaction2Redox2Alcohols1Alloys and their properties1Biological molecules1Carbon cycle1Cell structure1Characteristics of living organisms1Corrosion of metals1Digestion1Electrolysis1Electromagnetic effects1Energy flow1Enzymes1Fuels1Gas exchange in humans1General properties of waves1Giant covalent structures1Heart1Hormones1Kinetic particle model of matter1Monohybrid inheritance1Oxides1Photosynthesis1Physical and chemical changes1Pressure1Radioactivity1Sexual reproduction in humans1Simple phenomena of magnetism1The characteristic properties of acids and bases1Thermal properties and temperature1Transition elements1What you needed in this session
Cambridge’s own grade thresholds for 2021 Oct/Nov, Paper 2 · Variant 2. A higher threshold means an easier paper — the bar moves with how the cohort did.