Cambridge Assessment International Education Science Stage 7 2024 Paper 1 PDF

Science Stage 7 Paper 1 2024 45 minutes No additional materials are needed. INSTRUCTIONS Answer all questions. Write your answer to each question in the space provided. You should show all your working on the question paper....

Science Stage 7 Paper 1 2024 45 minutes No additional materials are needed. INSTRUCTIONS Answer all questions. Write your answer to each question in the space provided. You should show all your working on the question paper. INFORMATION The total mark for this paper is 50. The number of marks for each question or part question is shown in brackets [ ]. 3144_01_4RP © UCLES 2024  2 1 This question is about animal and plant cells. (a) Look at the diagram of an animal cell. Complete the labels on the diagram. Choose from the list. cell wall chloroplast cytoplasm mitochondrion nucleus cell membrane sap vacuole............................................................................................................................................................ (b) Name two cell structures that are only found in plant cells. 1 2 (c) What is the function of mitochondria in cells? © UCLES 2024 S/S7/01  3 2 Look at the particle models of some substances. The circles , and represent different types of atoms. A B C D E F (a) Which particle model represents a solid element? (b) Which particle models represent pure compounds? and Explain your answer. (c) Which particle model represents a mixture of elements? (d) Which particle model represents a mixture of compounds? © UCLES 2024 S/S7/01 [Turn over  4 (e) Mercury is a liquid at room temperature. The circle represents an atom of mercury. Draw in the box the particle model of mercury at room temperature. (f) Steel is an alloy. Explain the meaning of the word alloy. © UCLES 2024 S/S7/01  5 3 During an activity there are changes in energy. Oliver climbs up the steps, walks along the platform and jumps into the water. platform steps splash in the water (a) Complete the sentences to describe the changes in energy. Choose from the list. chemical electrical sound thermal When Oliver makes a splash in the water, some of his energy is converted into energy and some into energy. (b) Energy dissipates during an activity. What does this mean? © UCLES 2024 S/S7/01 [Turn over  6 4 Look at the diagram of a model of a tectonic plate boundary. tectonic plate magma (a) Describe three events that occur near this type of tectonic plate boundary. 1 2 3 (b) Complete the sentences about the model of plate tectonics. Choose from the list. atmosphere magma core mantle crust water The solid outer layer of the Earth consists of the and the upper part of the. The solid outer layer of the Earth has tectonic plates that move. The tectonic plates move because of flow in the mantle. © UCLES 2024 S/S7/01  7 5 Look at the diagrams of two specialised cells. cell A root hair cell NOT TO SCALE (a) What is the name of cell A? (b) Explain how the structure of the root hair cell is adapted to its function. © UCLES 2024 S/S7/01 [Turn over  8 6 Blessy wants to identify some gases. Draw a straight line to match each gas to the correct test for the gas. gas test for the gas carbon dioxide relights a glowing splint hydrogen turns limewater milky burns with a squeaky pop when oxygen ignited with a burning splint © UCLES 2024 S/S7/01  9 7 Yuri draws a diagram to show how he hears the sound made by a loudspeaker. loudspeaker Yuri The dots in the diagram represent air particles. (a) Describe what happens to air particles when the loudspeaker makes a sound. (b) Explain why sound does not travel through a vacuum. © UCLES 2024 S/S7/01 [Turn over  10 8 The diagram shows part of the water cycle. condensation water vapour precipitation evaporation A groundwater (a) Identify and describe process A. process A description (b) Draw a straight line to match each process to its correct description. process description the process of water vapour changing precipitation into liquid water the process of liquid water changing condensation into water vapour the process by which water evaporation falls from clouds © UCLES 2024 S/S7/01  11 9 Class 7 investigate growth in plants. (a) The class use secondary information sources. What is a secondary information source? (b) Class 7 investigate the growth of five different plant species. In their first experiment the teacher: fills a plant pot with soil puts 5 seeds of a plant species into the soil waters the soil leaves the seeds for 10 days to grow into seedlings. The teacher repeats the experiment four more times using different plant species. Mia and Jamila each choose different ways to measure the growth of the seedlings. Mia finds the mass of each plant pot and soil before and after the 10 days. Jamila measures the height of the seedlings after 10 days and calculates the average height. (i) Explain why Mia’s method of measuring the growth does not give accurate results. (ii) Explain why Jamila’s results are reliable. (iii) Describe and explain one safety precaution the teacher takes in this investigation. safety precaution explanation © UCLES 2024 S/S7/01 [Turn over  12 10 Mike investigates three substances, milk, vinegar and bleach. He wants to know the pH of each of the three liquids. Write down how Mike does this investigation. Include: the names of any chemicals he uses the method how Mike is able to make a conclusion from his results. © UCLES 2024 S/S7/01  13 11 Lily investigates how the number of lamps in an electrical circuit affects the current. She uses this electrical circuit. battery of cells 1.20 meter lamp (a) The battery of cells has hazard symbols. hazard symbol A hazard symbol B Write down the meaning of each of these hazard symbols. hazard symbol A hazard symbol B (b) The meter is used to measure current. Write down the name of the meter used to measure current. © UCLES 2024 S/S7/01 [Turn over  14 (c) Lily increases the number of lamps in the electrical circuit and records the current. She repeats the experiment three times and calculates the average current. Here are her results. number current current current average current of lamps in A in A in A in A 1 1.22 1.20 1.18 1.20 2 0.60 0.61 0.59 0.60 3 0.42 0.38 1.30 0.40 4 0.30 0.30 0.30 0.30 5 0.25 0.27 0.20 (i) Write down the anomalous current reading. current A (ii) Calculate the average current for 5 lamps. average current A (iii) Complete the sentence. As the number of lamps is doubled the current. © UCLES 2024 S/S7/01  15 12 Complete the sentence about tidal forces on Earth. Tidal forces on Earth are due to the force of attraction between the Earth, and. 13 Describe the difference between electrical conductors and electrical insulators. Use the idea of electrons in your answer. Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity. To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge Assessment International Education Copyright Acknowledgements Booklet. This is produced annually and is available to download at https://lowersecondary.cambridgeinternational.org/ Cambridge Assessment International Education is part of Cambridge Assessment. Cambridge Assessment is the brand name of the University of Cambridge Local Examinations Syndicate (UCLES), which is a department of the University of Cambridge. © UCLES 2024 S/S7/01 [Turn over © UCLES 2024 The Periodic Table of Elements Group 1 2 3 4 5 6 7 8 1 2 H He hydrogen helium Key 1 4 3 4 atomic number 5 6 7 8 9 10 Li Be atomic symbol B C N O F Ne lithium beryllium name boron carbon nitrogen oxygen fluorine neon 7 9 relative atomic mass 11 12 14 16 19 20 11 12 13 14 15 16 17 18 Na Mg Al Si P S Cl Ar sodium magnesium aluminium silicon phosphorus sulfur chlorine argon 23 24 27 28 31 32 35.5 40 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr potassium calcium scandium titanium vanadium chromium manganese iron cobalt nickel copper zinc gallium germanium arsenic selenium bromine krypton 39 40 45 48 51 52 55 56 59 59 64 65 70 73 75 79 80 84 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 16 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe S/S7/01 rubidium strontium yttrium zirconium niobium molybdenum technetium ruthenium rhodium palladium silver cadmium indium tin antimony tellurium iodine xenon 85 88 89 91 93 96 – 101 103 106 108 112 115 119 122 128 127 131 55 56 57–71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 lanthanoids Cs Ba Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn caesium barium hafnium tantalum tungsten rhenium osmium iridium platinum gold mercury thallium lead bismuth polonium astatine radon 133 137 178 181 184 186 190 192 195 197 201 204 207 209 – – – 87 88 89–103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 actinoids Fr Ra Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og francium radium rutherfordium dubnium seaborgium bohrium hassium meitnerium darmstadtium roentgenium copernicium nihonium flerovium moscovium livermorium tennessine oganesson – – – – – – – – – – – – – – – – – 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 lanthanoids La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu lanthanum cerium praseodymium neodymium promethium samarium europium gadolinium terbium dysprosium holmium erbium thulium ytterbium lutetium 139 140 141 144 – 150 152 157 159 163 165 167 169 173 175 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 actinoids Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr actinium thorium protactinium uranium neptunium plutonium americium curium berkelium californium einsteinium fermium mendelevium nobelium lawrencium – 232 231 238 – – – – – – – – – – –