IGCSE Sciences - Co-Ordinated (0973) — May–June 2025, Paper 22
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Which characteristic occurs in all living organisms? A egestion B excretion C photosynthesis D plasmolysis
Answer this question and get it marked →Which row shows a specialised cell type matched with its function? cell type function --- --- --- A ciliated movement of mucus B egg transport of oxygen C red blood phagocytosis D…
Answer this question and get it marked →The mass of a peeled potato is recorded. The potato is put in a salt solution with a lower water potential than the potato for two hours. The outside of the potato is then dried…
Answer this question and get it marked →Which row shows a large molecule and the small molecule it is made from? large molecule small molecule --- --- --- A glycogen glucose B glycogen amino acid C oil amino acid D oil…
Answer this question and get it marked →Six test-tubes contain amylase and starch solution. The temperatures of the test-tube contents are different. All other conditions are the same. The table shows the time taken for…
Answer this question and get it marked →Which row shows the transport and use of nitrate ions by plants? tissue used to transport nitrate ions around plant nitrate ions used to make --- --- --- A phloem amino acids B…
Answer this question and get it marked →Starch is chemically digested into maltose by the enzyme amylase. What are the properties of the maltose molecules? A large and insoluble B large and soluble C small and insoluble…
Answer this question and get it marked →Which row shows the conditions that will increase the rate of transpiration from a plant? temperature humidity --- --- --- A high low B high high C low high D low low
Answer this question and get it marked →The diagram shows a front view of a human heart. Four chambers are labelled P, Q, R and S. In the front view, Q and P are on the left side of the diagram (the patient's right…
Answer this question and get it marked →The homeostatic control of body temperature is shown as a flow sequence: 'constant internal body temperature' → 'increase in body temperature' → X → 'constant internal body…
Answer this question and get it marked →Some information about a donkey and a horse is shown. - The sperm from a donkey is able to fertilise the egg from a horse. - The nucleus of a body cell from a horse has 64…
Answer this question and get it marked →The diagram shows a flower. The flower has large feathery, branched stigmas hanging outside the flower and anthers on long filaments that also hang outside the flower, with no…
Answer this question and get it marked →Information about a lake is shown. - Aquatic plants grow in the lake. - Aquatic plants are eaten by small fish. - Small fish are eaten by large fish. - Small fish are eaten by…
Answer this question and get it marked →Which statement explains why metals conduct electricity? A There is a 'sea' of delocalised electrons. B The positive ions move over each other. C There is an electrostatic…
Answer this question and get it marked →Ammonia decomposes when heated in a sealed container in the presence of an iron catalyst. The equation for the reaction is shown. 2NH₃(g) → N₂(g) + 3H₂(g) 40.0 dm³ of ammonia is…
Answer this question and get it marked →The table shows the initial and final temperatures of four different reactions. reaction initial temperature / °C final temperature / °C --- --- --- 1 20 20 2 20 30 3 25 20 4 25…
Answer this question and get it marked →Which processes are physical changes? 1 Hydrogen gas joins with oxygen gas to form steam. 2 Liquid water turns into steam. 3 Cl₂(g) → 2Cl(g) 4 CH₄(l) → CH₄(g) A 1 and 2 B 1 and 3…
Answer this question and get it marked →Equal masses of limestone pieces are reacted with acid in two experiments. Only one change to the conditions is made between experiment 1 and experiment 2. The volume of gas…
Answer this question and get it marked →Which row describes an element on the left of the Periodic Table and its oxide? type of element type of oxide --- --- --- A metallic basic B non-metallic acidic C metallic acidic…
Answer this question and get it marked →Part of the Periodic Table is shown, with four elements labelled by their general positions: W is at the far left of the bottom period (Group I); X is in the middle (transition…
Answer this question and get it marked →Which statement describes what happens when calcium carbonate is added to the blast furnace during the extraction of iron? A It burns and provides heat. B It decomposes and…
Answer this question and get it marked →Which row shows a greenhouse gas and its environmental effect? gas environmental effect --- --- --- A methane acid rain B methane global warming C carbon monoxide acid rain D…
Answer this question and get it marked →Which statement explains how oxides of nitrogen are formed in a car engine? A Nitrogen from the air reacts with the fuel. B Oxygen and nitrogen from the air react together. C…
Answer this question and get it marked →A student prepares an insoluble salt by neutralising an acid with an alkali. Which method is used to separate the salt from the reaction mixture? A chromatography B distillation C…
Answer this question and get it marked →A molecule of methane contains one carbon atom and has the formula CH₄. A molecule of octane contains eight carbon atoms. How many hydrogen atoms are in a molecule of octane? A 11…
Answer this question and get it marked →Large alkane molecules are cracked to form smaller molecules. Which equations represent cracking reactions? 1 C₁₈H₃₈ → 2C₆H₁₄ + C₆H₁₂ 2 C₁₈H₃₈ → H₂ + 3C₆H₁₂ 3 C₁₅H₃₂ → C₅H₁₀ +…
Answer this question and get it marked →Which diagram represents the structure of nylon? Four candidate displayed structures are shown: A a saturated hydrocarbon chain (four CH₂-type carbons each with H atoms, no other…
Answer this question and get it marked →In which speed-time graph is acceleration not constant or 0? Four speed-time graphs are shown (speed on y-axis, time on x-axis): A a downward curve - speed decreasing with a…
Answer this question and get it marked →A lamp produces 760 J of wasted energy for every 1000 J of energy supplied to it. What is the efficiency of the lamp? A 0.24% B 0.76% C 24% D 76%
Answer this question and get it marked →Atmospheric pressure is 1.0 × 10⁵ Pa. A football pitch is 105 m long and 68 m wide. What is the total weight of the air above the football pitch? A 14 N B 1.7 × 10⁷ N C 3.5 × 10⁷…
Answer this question and get it marked →Which surface reflects the most thermal radiation? A a black, dull surface B a black, shiny surface C a white, dull surface D a white, shiny surface
Answer this question and get it marked →Liquid water boils at 100 °C to produce steam. The volume of the steam at 100 °C is much greater than the volume of the liquid water. Which statement explains the increase in…
Answer this question and get it marked →A wave approaches a gap in a barrier. The gap is the same size as the wavelength of the wave. The arrow shows the direction of the wave. Which diagram shows what happens to the…
Answer this question and get it marked →What is the difference between a real image and a virtual image? A A real image can be shown on a screen, but a virtual image cannot. B A real image is always formed by a…
Answer this question and get it marked →Which row shows the type of electromagnetic wave used in each application? television remote controllers satellite television --- --- --- A infrared microwaves B infrared…
Answer this question and get it marked →A student makes an electromagnet with a steel core. There is a problem with the electromagnet. Which problem with the electromagnet is caused by using a steel core? A The…
Answer this question and get it marked →There is a current of 100 mA in a circuit. How much charge flows through the circuit in 1.5 minutes? A 0.15 C B 9.0 C C 150 C D 9000 C
Answer this question and get it marked →A student connects a length of metal resistance wire to a battery. The circuit is a single loop containing a battery (cells) and the metal resistance wire, with the current…
Answer this question and get it marked →A nucleus of ²³⁸₉₂U undergoes radioactive decay to produce a nucleus of thorium (Th) and an alpha particle. Which equation shows this decay? A ²³⁸₉₂U → ²³⁸₉₃Th + ⁰₋₁α B ²³⁸₉₂U →…
Answer this question and get it marked →Which process describes how energy is released from a stable star? A fission of helium into hydrogen B fission of hydrogen into helium C fusion of helium into hydrogen D fusion of…
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