IGCSE Science - Combined (0653) — May–June 2024, Paper 21
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →The diagram shows a plant cell and an animal cell as seen under a light microscope. P plant cell animal cell What is structure P and what is one of its functions? structure P…
Answer this question and get it marked →The diagram represents the enzyme amylase and the products of digestion by amylase. amylase X Y What are products X and Y? X Y A amino acid amino acid B fatty acid glycerol C…
Answer this question and get it marked →Which type of cell needs a supply of magnesium ions to carry out its main function? A a ciliated cell B palisade mesophyll cell C a red blood cell D a root hair cell
Answer this question and get it marked →Which process produces food molecules that are small enough to be absorbed? A chemical digestion B egestion C ingestion D mechanical digestion
Answer this question and get it marked →Which statement about the structure and function of blood vessels is correct? A Arteries have valves and always carry oxygenated blood. B Arteries have a thick muscular wall to…
Answer this question and get it marked →Which processes use the energy released by respiration? protein diffusion growth osmosis synthesis A key B = yes C = no D
Answer this question and get it marked →Molecules from the balanced chemical equation for aerobic respiration are listed. 1 C6H12O6 2 6CO2 3 6H2O 4 6O2 What represents the correct equation for aerobic respiration using…
Answer this question and get it marked →Which statement about adrenaline is correct? A It is produced by a gland. B It is transported in the red blood cells. C It only has one target organ. D It reduces the size of the…
Answer this question and get it marked →Auxin stimulates cell elongation. If a light shines onto a shoot, why does it grow towards the direction of the light? A Auxin spreads evenly through the shoot. B Auxin stays in…
Answer this question and get it marked →Which statement about sexual reproduction is always correct? A It involves only one parent. B It involves the fusion of nuclei. C It produces genetically identical offspring. D It…
Answer this question and get it marked →Which row describes adaptations of a wind-pollinated flower? anthers stigma large petals inside flower outside flower A B C D
Answer this question and get it marked →The list shows the adaptive features of some gametes. 1 a flagellum 2 a jelly coat 3 a sac of enzymes at one end 4 a store of energy Which features are present in a human male…
Answer this question and get it marked →The diagram shows a food web. python eagle wolf thrush rat dragonfly frog grasshopper fruit fly butterfly corn mangoes flowering lavenders plant How many of the food chains in…
Answer this question and get it marked →50 g of a liquid alkane at 20 C is left in an open, insulated beaker for 30 minutes. After this time, the mass of the liquid is 42 g and its temperature is 18 C. Which statement…
Answer this question and get it marked →What is an example of a physical change? A carbon dioxide turning limewater milky B the crystallisation of copper(II) sulfate from solution C the electrolysis of molten lead(II)…
Answer this question and get it marked →Which statement defines the nucleon number of an atom? A It is the total number of neutrons and protons in the atom. B It is the total number of neutrons and electrons in the…
Answer this question and get it marked →The formula of magnesium nitrate is Mg(NO3)2. Which symbols represent the ions in magnesium nitrate? magnesium nitrate A Mg+ NO3– B Mg+ NO32– C Mg2+ NO32– D Mg2+ NO3–
Answer this question and get it marked →Which rows identify the electrode products for the named electrolyte? product product electrolyte at anode at cathode 1 dilute sulfuric acid oxygen hydrogen 2 dilute sulfuric acid…
Answer this question and get it marked →Hydrogen reacts with oxygen to produce water as shown. 2H–H + O=O o 2H–O–H The reaction causes the surroundings to heat up. Which row identifies the type of reaction and explains…
Answer this question and get it marked →An experiment is set up to investigate the rate of reaction between calcium carbonate and dilute hydrochloric acid. A fixed mass of solid calcium carbonate is placed in a conical…
Answer this question and get it marked →Which aqueous substances form a white precipitate when they are mixed? A barium chloride and hydrochloric acid B barium chloride and nitric acid C silver nitrate and nitric acid D…
Answer this question and get it marked →All sodium compounds are soluble. Magnesium hydroxide is insoluble. An excess of a solid is added to dilute nitric acid, mixed, filtered and then the filtrate is left to…
Answer this question and get it marked →Astatine is an element near the bottom of Group VII in the Periodic Table. Which row shows properties of astatine? physical state at reacts with room temperature iodide ions A gas…
Answer this question and get it marked →Which statement about the properties of the elements in Period 3 of the Periodic Table is correct? A The elements on the left lose electrons more readily. B The elements on the…
Answer this question and get it marked →Iron is extracted from its ore in a blast furnace. Which statement about this process is correct? A Carbon dioxide reduces iron(III) oxide. B Iron(III) oxide reduces carbon…
Answer this question and get it marked →A water supply contains small insoluble impurities. It also contains bacteria. Which statement describes how the insoluble impurities are removed and how the bacteria are killed?…
Answer this question and get it marked →Which products are obtained by the cracking of larger alkane molecules? A smaller alkane molecules, smaller alkene molecules and hydrogen B smaller alkane molecules only C smaller…
Answer this question and get it marked →Five identical solid spheres are placed in a measuring cylinder containing a liquid. The diagrams show the measuring cylinder before and after the spheres are placed inside. 200…
Answer this question and get it marked →A book rests on a table. Which two quantities are needed to calculate the pressure exerted by the book on the table? A the density of the book and the volume of the book B the…
Answer this question and get it marked →Which row shows the expressions for the gravitational potential energy (GPE) and the kinetic energy (KE) of an object? GPE KE mg 1 2 A 2 mv h mg 2 2 (mv) 1 B h 2 C mgh 1 2 mv 2 D…
Answer this question and get it marked →Which row compares the distances between the molecules and the forces between the molecules in a solid and in a gas? distances between forces between the molecules the molecules A…
Answer this question and get it marked →Which statement is correct for evaporation? A Evaporation occurs only at the boiling point of the liquid. B Evaporation occurs only at the surface of a liquid. C Evaporation…
Answer this question and get it marked →A sea wave reaches the shore at a rate of three wavelengths every 60 s. What is the frequency of the wave? A 0.050 Hz B 1.0 Hz C 3.0 Hz D 20 Hz
Answer this question and get it marked →A sound wave moves from a solid into a liquid. The frequency of the sound does not change. What happens to the speed and what happens to the wavelength of the sound wave? speed…
Answer this question and get it marked →A thin converging lens has a focal length of 5.0 cm. The lens is placed at different distances from the object. At which distance does the lens act as a magnifying glass? A 15 cm…
Answer this question and get it marked →A plastic rod becomes negatively charged when rubbed with a cloth. The cloth becomes positively charged. Which statement describes the charging process? A The rod and the cloth…
Answer this question and get it marked →Which list contains a material that prevents electrical charge from flowing through it? A aluminium, copper, mercury B brass, nickel, steel C glass, gold, zinc D silver, iron, lead
Answer this question and get it marked →Which expression is equal to current? A charge time charge B time C resistance potential difference (p.d.) resistance D potential difference (p.d.)
Answer this question and get it marked →The diagrams show four circuits, each containing an ammeter and two lamps of different resistances. Which circuit shows an ammeter with a reading equal to the current in each…
Answer this question and get it marked →There is a current of 20 mA in an electrical component when there is a potential difference (p.d.) of 10 V across it. How much energy is transferred by the component in 30…
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