Science Stage 7 Paper 1 Cambridge Lower Secondary Progression Test Mark Scheme 3144_01_MS_3RP © UCLES 2023 2023 3144/01 Science Stage 7 Paper 1 Mark Scheme 2023 General guidelines on marking Many descriptive answers can be expressed in a variety of ways. Professional judgement can be used in these cases, providing it matches the marking points and further information in the mark scheme. Answers may have words spelt incorrectly. Credit is normally given for phonetically correct answers, unless the word has a scientifically different meaning. For example, where the answer should be antennae, credit will be given for antena but not for anthen (too close to anther). Only the science is being assessed, so answers do not need to be grammatically correct. Significant figures will be indicated in the question or in the mark scheme. Unless specified all marking points are independent. Annotations and abbreviations / or alternate responses for the same marking point ( ) brackets the words or units in brackets do not need to be stated, for example, (recycles or releases or provides) minerals = minerals scores the mark underline exact word is required Accept an acceptable response Do not accept indicates an incorrect response that would contradict another otherwise correct alternative Ignore indicates an irrelevant answer that is not creditworthy. Full marks can still be achieved even with answers that are ignored. Note provides extra information when necessary ecf error carried forward; marks are awarded if an incorrect response has been carried forward from earlier working provided the subsequent working is correct ora or reverse argument; for example, as mass increases, volume increases could be written as mass decreases, volume decreases © UCLES 2023 Page 2 of 12 © UCLES 2023 1(b) 1(a) Question 3144/01 large vacuole (idea that) column-shaped Page 3 of 12 where most respiration reactions happen jelly-like substance, where chemical reactions happen contains genetic information and controls what happens inside the cell controls the movement of substances into and out of the cell (are packed with many) chloroplasts any two from mitochondria cytoplasm cell membrane Answer Marks Science Stage 7 Paper 1 Mark Scheme Ignore chlorophyll Accept (idea that) large vacuole so chloroplasts are towards the edge of the cell or close to the cell membrane or closer to the light = 2 marks Accept (idea that) column-shaped so they can be arranged closely together = 2 marks Accept (are packed with many) chloroplasts so they can absorb light (energy) = 2 marks 2 each correct answer = 1 mark if two lines from a part of a cell drawn and one is incorrect = 0 marks for that part of a cell one or two lines correct = 1 mark 2 three lines correct = 2 marks Further Information 2023 Question © UCLES 2023 2 1(c) Question 3144/01 element compound alloy Page 4 of 12 a substance containing atoms that are free to move an impure substance containing the same type of atom a mixture containing two different types of metal atoms a pure substance containing different types of atoms bonded together a pure substance containing the same type of atom Answer has (plant) chloroplasts but no cell wall Answer Marks Marks Science Stage 7 Paper 1 Mark Scheme if two lines from a material drawn and one is incorrect = 0 marks for that material 3 each correct line = 1 mark Further Information 1 Accept has (animal) flagella or eye spot instead of no cell wall Further Information 2023 © UCLES 2023 Page 5 of 12 (distance travelled by sound wave =) time x 1500 or 4 x 1500 or 6000 (m) 3(b) 3000 (m) echo Answer Marks Science Stage 7 Paper 1 Mark Scheme 3(a) Question 3144/01 2 1 Accept ecf from distance travelled by sound wave for second marking point Accept correct answer with or without working = 2 marks Further Information 2023 © UCLES 2023 4(c) 4(b) 4(a) Question 3144/01 Page 6 of 12 it is not a moving model or (idea that) it does not show the speed of movement shows the different layers of the Earth shows what happens deep under the Earth’s surface shows volcanoes or mountains forming shows the plates moving shows the magma (in the mantle) moving any two from Accept volcano volcanic eruption 2023 Accept shows plates move in the same direction as the magma (in the mantle) = 2 marks 2 each correct answer = 1 mark Accept rift valleys Accept sea floor spreading Accept (idea of) subduction Accept tsunami earthquake 3 each correct answer = 1 mark Accept lithosphere = 2 marks 2 each correct answer = 1 mark Further Information Accept fold mountains Marks (idea of fold) mountain building (uppermost part of) mantle crust Answer Science Stage 7 Paper 1 Mark Scheme © UCLES 2023 5 Question 3144/01 no fur no feathers Answer moist skin Page 7 of 12 fish ....................................... scales reptile ....................................... dry scaly skin bird ....................................... feathers mammal ....................................... fur vertebrate does not show earthquakes (idea that) it does not show how long the mountains take to form (idea that) there are no labels, e.g. no temperature, no depth amphibian ....................................... no scales Science Stage 7 Paper 1 Mark Scheme Further Information one or two correct = 1 mark three or four correct = 2 marks 3 all five correct = 3 marks Marks 2023 lemon juice 6(d) Page 8 of 12 it dissipates or it is transferred to the environment or surroundings 7(b)(ii) © UCLES 2023 20 (J) light (energy) sound (energy) thermal (energy) Answer Answer Marks Marks Science Stage 7 Paper 1 Mark Scheme 7(b)(i) electrical (energy) 7 or seven 6(c) 7(a) purple 6(b) Question 4 or four 6(a) Question 3144/01 Further Information Ignore it is wasted or it is lost Accept any reasonable energy transfer process involving sound or thermal energy, e.g. thermal energy makes molecules move faster 1 Accept it spreads out 1 Accept light, sound and thermal in any order Accept heat (energy) for thermal 1 all four correct = 1 mark 1 1 Ignore green 1 1 Further Information 2023 © UCLES 2023 Page 9 of 12 acid is being neutralised (by the alkali) / ora increases or rises or gets bigger 10(b) Answer species produce fertile offspring / ora donkey and horse 21 (oxygen) Answer (78) nitrogen precipitation Question Question percentage by volume gas Answer Marks Marks Marks Science Stage 7 Paper 1 Mark Scheme 10(a) 9 8 Question 3144/01 2 each correct answer = 1 mark Accept any indication of the correct answer, e.g. ticking or underlining, but circling takes precedence 1 more than one answer circled = 0 marks Further Information correct explanation = 1 mark 2 both ticked = 1 mark Further Information Accept N or N2 for nitrogen 2 each correct answer = 1 mark Further Information 2023 © UCLES 2023 as mass (of most planets) increases so does gravity and relevant data to support, e.g. Jupiter has the biggest mass and the most gravity 11(b)(ii) Page 10 of 12 (idea that) there is no relationship and relevant data to support, e.g. Uranus has more mass than Earth but has less gravity or as mass (of most planets) increases so does gravity except for Uranus and relevant data to support, e.g. Uranus has more mass than Earth but has less gravity or Jupiter (that) pulls objects towards each other or pulls objects towards the centre of the planet a force Answer Marks Science Stage 7 Paper 1 Mark Scheme 11(b)(i) 11(a) Question 3144/01 correct data to support = 1 mark 2 relationship = 1 mark 1 Accept a force of attraction between two objects = 2 marks Accept pulls objects towards a named planet, e.g. Earth 2 each correct answer = 1 mark Further Information 2023 insulator(s) 13(c) © UCLES 2023 electron(s) 13(b) Answer Page 11 of 12 Marks 2023 1 Ignore non-conductor 1 Accept ions(s) Accept symbols, i.e. Fe for iron, Al for aluminium, C for graphite 1 all four correct any order for the mark Further Information Do not accept harmful (mercury nitrate) toxic or poisonous 3 each correct answer = 1 mark Further Information Accept inflammable iron, steel, graphite, aluminium Question Marks (ethanol) flammable (sulfuric acid) corrosive Answer Science Stage 7 Paper 1 Mark Scheme 13(a) 12 Question 3144/01 © UCLES 2023 14(b) 14(a) Question 3144/01 hawk (hawk) decays or decomposes hawk lizard grasshopper (hawk) excretes waste lizard grasshopper grasshopper grass Answer Page 12 of 12 Marks Science Stage 7 Paper 1 Mark Scheme Accept decomposition Accept faeces or urine or uric acid Accept excretion 2 each correct answer = 1 mark three or more incorrect arrows = 0 marks one incorrect arrow = maximum 1 mark but one correct = 0 marks two or three correct = 1 mark 2 all four correct = 2 marks Further Information 2023
