IGCSE Science - Combined (0653) — May–June 2025, Paper 23
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Which structure is not found in animal cells? A cell wall B cytoplasm C nucleus D cell membrane
Answer this question and get it marked →Palisade mesophyll cells are specialised cells. What is the function of these specialised cells? A photosynthesis B transport C reproduction D immunity
Answer this question and get it marked →A human egg cell is 0.12 mm in diameter. How is this converted to a measurement in micrometres, μm? A multiply by 100 B multiply by 1000 C divide by 100 D divide by 1000
Answer this question and get it marked →Which row about osmosis is correct? molecules that move details of movement type of permeable membrane --- --- --- --- A water from a dilute solution to a concentrated solution…
Answer this question and get it marked →The graph shows the activity of an enzyme at different temperatures. The curve of enzyme activity (vertical axis) against temperature/°C (horizontal axis, 0 to 60) rises from a…
Answer this question and get it marked →An aquatic plant is in a test-tube of water. The test-tube is sealed and placed in the dark. The diagram shows a sealed test-tube containing water with an aquatic plant submerged…
Answer this question and get it marked →A pregnant woman is told she is deficient in iron. Which food increases the iron content in her diet? A cheese B rice C milk D red meat
Answer this question and get it marked →Chemical digestion and physical digestion happen in various parts of the alimentary canal and associated organs. In which organ do both processes happen? A liver B mouth C…
Answer this question and get it marked →A test-tube is used to model the effect of protease on a protein suspension in the stomach. The diagram shows a test-tube containing protease and protein suspension at 37 °C. What…
Answer this question and get it marked →Water moves through the stomata of leaves during transpiration. Which row shows the direction of water movement and the form of the water? direction form --- --- --- A into the…
Answer this question and get it marked →The diagrams show cross-sections of two different blood vessels. Vessel P is shown as a circular cross-section with a relatively thick wall and a small central lumen. Vessel Q is…
Answer this question and get it marked →Which types of consumer describe the cat in this food web? 1 primary consumer 2 secondary consumer 3 tertiary consumer The food web shows: plant is eaten by sparrow, slug and…
Answer this question and get it marked →What is an ecosystem? A a network of inter-connected food chains B a specific area in which a plant or an animal lives C all the plants and animals that live within a specific…
Answer this question and get it marked →Which diagram represents molecules of a single compound? Each option shows a box containing particles drawn as open (white) circles and filled (black) circles bonded together. A…
Answer this question and get it marked →Which statement about ions is correct? A Atoms lose or gain electrons to form ions. B Ions are held together by strong attraction between negative ions. C Ions form when atoms…
Answer this question and get it marked →Which formula does not represent an acid? A H₂SO₄ B HCl C HNO₃ D NH₃
Answer this question and get it marked →Apparatus used to electrolyse molten lead(II) bromide is shown. The diagram shows a d.c. power supply connected to two electrodes dipping into a container of molten liquid. The…
Answer this question and get it marked →The reaction pathway diagram for a reaction is shown. The vertical axis is energy and the horizontal axis is progress of reaction. Three energy levels are marked X (lowest, the…
Answer this question and get it marked →Calcium carbonate pieces react with dilute hydrochloric acid. Which change decreases the rate of the reaction? A Add a catalyst. B Decrease the temperature. C Increase the…
Answer this question and get it marked →Barium sulfate is an insoluble salt. It is made when aqueous barium chloride reacts with compound W. Which row identifies compound W and the method used to obtain barium sulfate…
Answer this question and get it marked →Aqueous chlorine is added to colourless aqueous potassium bromide. The diagram shows a dropper adding aqueous chlorine into a test-tube containing aqueous potassium bromide. Which…
Answer this question and get it marked →Which diagram represents the structure of an alloy? A shows a regular lattice of alternating positive (+) and negative (–) ions (an ionic compound). B shows a close-packed…
Answer this question and get it marked →Which graph explains why scientists are concerned about climate change? Each option plots concentration of carbon dioxide in the atmosphere (vertical axis) against year…
Answer this question and get it marked →Methane, ethane and propane are all members of the same homologous series. Which statement about these compounds is correct? A They contain double carbon–carbon covalent bonds. B…
Answer this question and get it marked →The diagram shows a chromatogram for a brown ink. The chromatography paper has a baseline at 0 cm where the brown ink spot was placed, and the solvent front is at 14 cm. Three…
Answer this question and get it marked →Which row describes the properties of fractions obtained from petroleum, from the bottom of the fractionating column to the top? chain lengths boiling points --- --- --- A…
Answer this question and get it marked →Iron is extracted from hematite in the blast furnace. Which row shows the substance that reduces iron(III) oxide and the source of this substance in the blast furnace? substance…
Answer this question and get it marked →On planet R, there is no atmosphere and the acceleration of free fall g is 4.5 m/s². A rock of mass 2.0 kg falls from rest on planet R and hits the ground 4.0 m below. What is the…
Answer this question and get it marked →The diagram shows a speed–time graph for the motion of a car. The graph plots speed (vertical axis) against time (horizontal axis). The line starts at the origin and rises with a…
Answer this question and get it marked →A boy runs up some stairs to get to the top. Which two quantities on their own are used to calculate the useful power transferred? A his weight and the height of the stairs B his…
Answer this question and get it marked →The diagram shows equipment used to demonstrate convection in air. Point X is labelled. A box with two chimneys on top sits over a base chamber. A burning candle is placed at the…
Answer this question and get it marked →Which states of matter contain particles that are close together? A solids, liquids and gases B liquids and gases only C solids and gases only D solids and liquids only
Answer this question and get it marked →Which two factors both increase the rate at which a shallow pool of water evaporates? A greater surface area and higher temperature B greater surface area and lower temperature C…
Answer this question and get it marked →The diagram shows a section of a rope. Four wave crests pass a point on the rope every second. Each wave crest travels 80 cm in one second. The diagram shows a transverse wave on…
Answer this question and get it marked →Which statement about waves is correct? A In a longitudinal wave, the vibration of the particles is at right angles to the direction of the wave. B In a sound wave, the vibration…
Answer this question and get it marked →A student measures the time taken for sound to travel a distance of 1.0 m in air, in water and in steel. The student puts the three materials in order of time taken, from shortest…
Answer this question and get it marked →The diagram shows the scale of an analogue voltmeter. The scale runs from 0 to 0.5 V with major divisions marked at 0, 0.1, 0.2, 0.3, 0.4 and 0.5 V, each major division subdivided…
Answer this question and get it marked →What is the relationship between the current in a resistor, the potential difference (p.d.) across it and its resistance? A current = p.d. / resistance B current = (p.d.)² /…
Answer this question and get it marked →The diagram shows two resistors connected to a battery. Two resistors are connected in parallel. The total current from the battery in the main circuit is 6.0 A. The current in…
Answer this question and get it marked →The life cycle of a star depends on whether it has a small mass, a large mass or a very large mass. Which stars have a supernova as one of the later stages in their life cycles? A…
Answer this question and get it marked →