IGCSE Sciences - Co-Ordinated (0654) — October–November 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 →Which term describes the ability to detect and respond to changes in the environment? A excretion B growth C movement D sensitivity
Answer this question and get it marked →The diagram shows some cells in the gas exchange system, with labels A, B, C and D. Which label shows the part of the gas exchange system where these cells are found? A label A B…
Answer this question and get it marked →Which biological molecule contains the elements carbon, hydrogen, nitrogen and oxygen? A carbohydrate B fat C oil D protein
Answer this question and get it marked →The graph shows the effect of temperature on the rate of an enzyme-controlled reaction. Which statements are correct? 1 Enzyme molecules denature above 50 degrees C and below 20…
Answer this question and get it marked →The diagram shows a mesophyll cell with structures A, B, C and D. In which structure does photosynthesis take place? A structure A B structure B C structure C D structure D
Answer this question and get it marked →The diagram shows a villus with structures P and Q (a capillary and a lacteal). What are structures P and Q and which substances do they absorb (P / Q / substance absorbed by P /…
Answer this question and get it marked →In which weather conditions is the rate of transpiration fastest? A cold and dry B cold and wet C warm and dry D warm and wet
Answer this question and get it marked →A student breathed gently in and out of the mouthpiece of the apparatus shown, with limewater in tubes P and Q. What were the results after 10 breaths (P / Q)? A colourless /…
Answer this question and get it marked →A student looks at an object at a distance and then looks at an object close by. This ability to focus on both objects is brought about by changing the shape of the lens. What is…
Answer this question and get it marked →Which statement describes one similarity between asexual and sexual reproduction? A They both involve gametes. B They both involve parent and offspring. C They both produce…
Answer this question and get it marked →Horn development in some cattle is controlled by a pair of alleles. The allele for not developing horns is dominant to the allele for developing horns. The pedigree diagram shows…
Answer this question and get it marked →What is an example of an ecosystem? A a decomposing log and the organisms in it B a food chain C the network of burrows in which some rabbits live D the oak trees in a forest
Answer this question and get it marked →Which processes change the amount of carbon dioxide in the air (process causing increase / process causing decrease in carbon dioxide)? A burning fossil fuels / photosynthesis in…
Answer this question and get it marked →Sea water is heated in the apparatus shown (a flask of sea water heated, with vapour passing to a condenser cooled by cold water at positions X and Y). Which row describes changes…
Answer this question and get it marked →An experiment is assembled to measure the rate of reaction between limestone and hydrochloric acid. A gas is released and its volume measured every five seconds. Which piece of…
Answer this question and get it marked →What is a property of a typical covalent compound? A low electrical conductivity B high melting point C low volatility D soluble in water
Answer this question and get it marked →The formula of an ammonium ion is NH4+. The formula of a phosphate ion is PO4 3-. What is the formula of ammonium phosphate? A (NH4)3PO4 B (NH4)2PO4 C NH4PO4 D NH4(PO4)3
Answer this question and get it marked →Which statement describes what happens during electrolysis? A Covalent compounds produce more complex substances. B Covalent compounds produce simpler substances. C Ionic…
Answer this question and get it marked →When a match burns, heat and light energy are produced. Which row describes the type of change and the type of reaction taking place (type of change / type of reaction)? A…
Answer this question and get it marked →The equation for the reaction between sulfur dioxide and oxygen is: 2SO2(g) + O2(g) - 2SO3(g). Which statements explain why the rate of this reaction increases at higher…
Answer this question and get it marked →All Group I metal compounds and all Group II metal chlorides are soluble in water. All Group II metal carbonates and barium sulfate are insoluble. Which method is used to prepare…
Answer this question and get it marked →Which electronic structure belongs to a non-metallic element? A 2 B 2,2 C 2,8,2 D 2,8,8,2
Answer this question and get it marked →Tennessine is a newly discovered halogen and is below astatine in Group VII of the Periodic Table. Which row predicts the appearance of tennessine and the effect of adding aqueous…
Answer this question and get it marked →Which statement about the extraction of metals is correct? A Aluminium ore is called hematite. B Aluminium is extracted from its ore by heating with carbon. C Iron oxide is…
Answer this question and get it marked →In a test for water, water turns anhydrous copper(II) ...(1)... from ...(2)... to ...(3)... . Which words complete gaps 1, 2 and 3 (1 / 2 / 3)? A chloride / blue / white B…
Answer this question and get it marked →What is a general formula for unsaturated hydrocarbons? A CnHn+2 B C2nH2n+2 C CnH2n D CnH2n+2
Answer this question and get it marked →Poly(ethene) and nylon are two different types of polymer. Which statement about these polymers is correct? A Nylon is an addition polymer. B The linkage between monomers in nylon…
Answer this question and get it marked →A solid, rectangular metal block has the dimensions 25 cm x 5 cm x 8 cm. The mass of the block is 2700 g. What is the density of the metal? A (25 x 5) / 2700 g / cm^3 B (25 x 5 x…
Answer this question and get it marked →The length of a spring changes when a force is applied. The table shows how the length depends on the force: 0 N - 22 cm; 1.0 N - 25 cm; 2.0 N - 28 cm; 3.0 N - 31 cm; 4.0 N - 35…
Answer this question and get it marked →A see-saw rests on a pivot at its centre. A child of weight 250 N sits on one side at a distance of 1.6 m from the pivot. A second child balances the see-saw by sitting on the…
Answer this question and get it marked →The Sun is the source of energy for most energy resources. In which group of resources is energy input from the Sun the only source of energy? A coal, geothermal, gasoline B…
Answer this question and get it marked →A student observes that a substance X does not flow. Which statement about substance X is correct? A It can be either a gas or a liquid. B It can only be a gas. C It can only be a…
Answer this question and get it marked →A ray of light travels from glass into air. In which direction is the light refracted and how does the speed of the light change (direction of refracted light / speed of light)? A…
Answer this question and get it marked →Gamma rays and microwaves are both electromagnetic radiations. Which statement about their frequencies and speeds in a vacuum is correct? A Gamma rays have greater frequencies…
Answer this question and get it marked →Which statement about the core of an electromagnet is correct? A It is made of soft iron because soft iron is easy to magnetise. B It is made of soft iron because soft iron does…
Answer this question and get it marked →A wire of a certain length has a resistance of 8.0 ohms. A second wire made of the same material has double the length and double the cross-sectional area of the first wire. What…
Answer this question and get it marked →A circuit contains a cell and two resistors connected in parallel. The currents in each part of the circuit are labelled I1, I2 and I3. What is the relationship between the…
Answer this question and get it marked →The instructions for a household lamp state that the plug must be fitted with a 3 A fuse. What happens if a 13 A fuse is fitted by mistake? A The fuse blows too easily. B The lamp…
Answer this question and get it marked →A transformer with an efficiency of 100% has an input current of 10 A. The input voltage is 100 V and the output voltage is 20 V. What is the output current? A 2.0 A B 10 A C 50 A…
Answer this question and get it marked →A uranium nucleus decays into a thorium nucleus. The thorium nucleus then decays into a protactinium nucleus: uranium-238 (Z=92) - thorium-234 (Z=90) - protactinium-234 (Z=91).…
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