IGCSE Sciences - Co-Ordinated (0973) — October–November 2023, 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 characteristic of a living organism releases energy for growth? A excretion B reproduction C respiration D sensitivity
Answer this question and get it marked →When a plant cell is put into a solution that has a lower water potential than the cell, the cytoplasm can pull away from the cell wall. What is the term for this? A flaccid B…
Answer this question and get it marked →Which colour does Benedict's solution change to when heated with a reducing sugar? A blue B blue-black C orange D purple
Answer this question and get it marked →The graph shows the effect of increasing temperature on the time taken for amylase to fully digest a sample of starch (the time falls to a minimum then rises again). [Graph: time…
Answer this question and get it marked →The diagram shows a cross-section through a leaf with tissues labelled A, B, C and D. Which tissue is adapted for gas exchange? [Diagram: leaf cross-section; D is the spongy…
Answer this question and get it marked →Pancreatic insufficiency is a condition that occurs when the pancreas is unable to produce enough enzymes. Which secretions are reduced due to this condition? A amylase, lipase…
Answer this question and get it marked →Which label shows the position of the xylem in the cross-section of the root of a dicotyledonous plant? [Diagram: root cross-section with labels A, B, C, D; the xylem is at the…
Answer this question and get it marked →Aerobic respiration releases energy from nutrient molecules. One molecule of glucose requires ...(1)... molecules of oxygen. The reaction releases ...(2)... molecules of carbon…
Answer this question and get it marked →During an experiment, auxin is applied to one side of a shoot just behind the tip. What will this stimulate? A decreased cell elongation in all cells B decreased cell elongation…
Answer this question and get it marked →Which part of the male reproductive system is correctly matched to its function? A prostate gland - transfers sperm to the urethra B scrotum - holds the testes outside of body C…
Answer this question and get it marked →Cats with polydactyly have an extra digit on their paw. The allele for polydactyly, P, is dominant to the allele for having five digits, p. The pedigree diagram shows a family of…
Answer this question and get it marked →Four processes that occur in mammals are listed. 1 muscle contraction 2 cell division 3 excretion 4 maintenance of a constant body temperature Which processes reduce the amount of…
Answer this question and get it marked →Forests are cut down and burnt in deforestation programmes. As a result of this, which gas in the atmosphere increases in concentration? A carbon dioxide B hydrogen C nitrogen D…
Answer this question and get it marked →Dye X is a mixture of different coloured substances. Chromatography is used to compare X with three other mixtures, P, Q and R. [Chromatogram: spots for X, P, Q, R; P contains the…
Answer this question and get it marked →What do the chemical symbols N2 and Ni represent? A N2 a compound, Ni a compound B N2 a compound, Ni an element C N2 an element, Ni a compound D N2 an element, Ni an element
Answer this question and get it marked →The nucleon number of a hydrogen atom is 1. What is present inside the nucleus of this atom? A one proton and one electron B one proton and one neutron C one proton only D one…
Answer this question and get it marked →When magnesium carbonate reacts with dilute hydrochloric acid, carbon dioxide gas is released. The equation is MgCO3 + 2HCl - MgCl2 + CO2 + H2O. Which volume of carbon dioxide,…
Answer this question and get it marked →The temperature of solution Q is 21 C. The temperature of solution P is 24 C. The two solutions are mixed. The temperature of the mixture is 31 C. Which statement is correct? A An…
Answer this question and get it marked →The rate of reaction between calcium carbonate and dilute hydrochloric acid is determined either by measuring the change in gas volume per unit time or by measuring the change in…
Answer this question and get it marked →The ionic equation for the reaction between iron(II) chloride and chlorine is 2Fe2+ + Cl2 - 2Fe3+ + 2Cl-. Which row shows the substance that is reduced and the oxidising agent? A…
Answer this question and get it marked →Substance X is mixed with aqueous sodium hydroxide. A green precipitate is produced. Which metal ion is present in X? A Cu2+ B Fe2+ C Fe3+ D Zn2+
Answer this question and get it marked →Potassium is in Group I of the Periodic Table. Which statement about potassium is correct? A It is a relatively hard metal. B It is less dense than lithium. C It has a higher…
Answer this question and get it marked →What is a use for argon? A as a catalyst B in alloys C in lamps D neutralising chemical waste
Answer this question and get it marked →Silver oxide is reduced by heating with carbon more easily than copper oxide is reduced by heating with carbon. A copper strip is placed into a solution of silver nitrate.…
Answer this question and get it marked →Catalytic converters are fitted to cars to remove some gases from exhaust emissions. Which gases are released by catalytic converters? A carbon dioxide and nitrogen B carbon…
Answer this question and get it marked →Sulfuric acid is manufactured by the Contact process. One of the reactions in this process converts sulfur dioxide to sulfur trioxide. Which statements about the conditions for…
Answer this question and get it marked →Which statements about monomers and polymers are correct? 1 Different polymers can have different linkages between monomers. 2 An addition polymerisation reaction produces more…
Answer this question and get it marked →The speed-time graph represents part of a car journey. The speed rises linearly from 10 m/s at time 0 to 18 m/s at time 5 s. [Speed-time graph: from (0, 10) to (5, 18).] How far…
Answer this question and get it marked →A rocket has a mass of 300 kg. Its motors produce a force of 12 000 N vertically upwards. The acceleration of free fall g is 10 m/s^2. What is the resultant force on the rocket…
Answer this question and get it marked →A uniform metre rule rests on a pivot at the 50 cm mark. A load L is placed at the 30 cm mark and a load of 6.0 N is placed at the 80 cm mark. The arrangement is balanced.…
Answer this question and get it marked →A hydroelectric energy storage scheme stores energy by pumping water up a mountain into a lake behind a dam. In 1.0 s, 10 000 kg of water is pumped into the lake and gains a…
Answer this question and get it marked →What is a thermocouple used to measure? A expansion B pressure C resistance D temperature
Answer this question and get it marked →A vacuum flask uses a vacuum between two shiny surfaces to keep a drink hot for a long time. [Diagram: vacuum flask with silvered glass walls, vacuum, hot drink.] How do the…
Answer this question and get it marked →When light passes from air into glass its speed decreases but its frequency remains constant. Light travelling in air enters a glass block at an angle of incidence that is greater…
Answer this question and get it marked →Which change to a sound wave makes the sound louder? A decreasing the amplitude B decreasing the wavelength C increasing the amplitude D increasing the wavelength
Answer this question and get it marked →Three charged balls P, Q and R are suspended by insulating threads. Ball P is negatively charged. Ball Q is brought close to ball P and the balls move away from each other. Ball Q…
Answer this question and get it marked →Which graph shows the current-voltage characteristics of an ohmic resistor and a filament lamp? [Graphs A-D: current vs voltage; ohmic resistor is a straight line through the…
Answer this question and get it marked →A battery is connected in a circuit to a 3.0 ohm resistor, a 6.0 ohm resistor and two ammeters P and Q. The resistors are in parallel; ammeter P reads the total current and…
Answer this question and get it marked →The current in an electric kettle used to boil water is 9.0 A. What is the most appropriate rating of fuse to use with this kettle? A 1 A B 3 A C 8 A D 13 A
Answer this question and get it marked →Three types of ionising radiation (alpha, beta and gamma) enter a magnetic field at right angles to the field. Which types of radiation are deflected? A alpha and beta only B…
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