[PDF] Cambridge Lower Secondary Progression Test - Science 2018 Stage 8 - Mark Scheme.pdf | Plain Text

Cambridge Lower Secondary Progression Test Science mark scheme Stage 8 SCIENCE_S8_MS_8RP © UCLES 2018

2 S/S8/MS © UCLES 2018 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 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. 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

3 S/S8/MS © UCLES 2018 [Turn over Stage 8 Paper 1 Mark scheme Question 1 Part Mark Answer Further Information 3 small intestine (stomach)organ large intestine pancreas C B (A) letter D produces enzymes (digests protein) absorbs waterfunction absorbs digested food each correct organ, letter, function linkage = 1 mark Total 3 Question 2 Part Mark Answer Further Information 4 element chemical symbol nitrogen phosphorus potassium silicon sodium sulfur Ni P N Na Po S K Si six correct lines = 4 marks five correct lines = 3 marks four correct lines = 2 marks two or three correct lines = 1 mark one correct line = 0 marks more than one line from an element is incorrect Total 4

4 S/S8/MS © UCLES 2018 Question 3 Part Mark Answer Further Information 3 see table belowfour correct rows = 3 marks three correct rows = 2 marks one or two correct rows = 1 mark more than one tick in a row = 0 marks for that row Accept any indication of correct answers, e.g. crosses or stars question decreases increases stays the same What happens to the loudness of the sound between X and Y?  What happens to the amplitude of the sound between X and Y?  What happens to the pitch of the sound between X and Y?  What happens to the frequency of the sound between X and Y?  Total 3

5 S/S8/MS © UCLES 2018 [Turn over Question 4 Part Mark Answer Further Information (a)2 put the material between the clips / put material in to complete circuit (close the switch) lamp lights (b)2 brittle ductile  heat insulators high melting point  low melting point each correct tick = 1 mark if three ticks two correct = 1 mark if three ticks one correct = 0 marks if four or five ticks = 0 marks Accept other indications of the correct answers but ticks take precedence Total 4

6 S/S8/MS © UCLES 2018 Question 5 Part Mark Answer Further Information (a)1Any one from temperature type of soil minerals / fertiliser amount of water supply of air / supply of CO 2 Ignore time interval / size or species of plant / amount of light Accept same size of cover (b)1Any one from mass of plants height of plants area of leaves / length of leaves / width of leaves (c)2 most growth = clear and least growth = black / green most photosynthesis in clear / no or little photosynthesis in dark / green not absorbed by plantcolours = 1 mark linked explanation = 1 mark Total 4 Question 6 Part Mark Answer Further Information 3 colour of light he shines at the fi ltercolour of fi ltercolour of light, if any, that comes through the fi lter (red) (red)red (green) (red)no light (white) (red)redeach correct answer = 1 mark for no light Accept nothing / black / no colour Do not accept white for no light Total 3

7 S/S8/MS © UCLES 2018 [Turn over Question 7 Part Mark Answer Further Information (a)1 water evaporates fasterAccept more transpiration (b) (i)1 xylemIgnore vessels (ii)2Any two from hollow tube / no contents no end walls / combine to form long tubes waterproof walls thick walls / rigid walls / strong walls Total 4 Question 8 Part Mark Answer Further Information (a) (i)1 the airAccept water (ii)1 iron + oxygen + water → hydrated iron oxide both needed for mark Accept O 2 for oxygen (iii)1 iron hydroxide or iron chloride or iron sulfate or iron carbonateIgnore the use of oxidation states in a formula Accept iron nitrate, iron phosphate Accept hydrated iron oxide (b)1 atomsAccept ions, electrons, protons, neutrons Total 4

8 S/S8/MS © UCLES 2018 Question 9 Part Mark Answer Further Information (a)3x-axis labelled as time in s(econds) and y-axis labelled as distance in m(etres) (60, 300) and (100, 500) plotted correctly line of best fit drawn through the plotted points 0 0204060 ........................ ........................distance in metres time in seconds80 100 100 200 300 400 500 labelling = 1 mark plotting = 1 mark best fit (through origin) = 1 mark Accept ± ½ a small square error in plotting (b)2 distance/time but 5 (m / s)1 mark. Accept any correct pair of distance and time, e.g. 50/10 2 marks. Accept correct answer with no working out Total 5 Question 10 Part Mark Answer Further Information (a)1 respiration more than one answer circled = 0 marks Accept other indications of answer but circle takes precedence (b)3Accept carbon dioxide and water in any order. each correct answer in box = 1 mark Ignore energy in equation Accept chemical formulae but names take precedence glucose is C 6H12O6 carbon dioxide is CO 2 water is H 2O Total 4 + + (oxygen)glucose sugar carbon dioxide water

9 S/S8/MS © UCLES 2018 [Turn over Question 11 Part Mark Answer Further Information (a) (i)1Atwo or more letters = 0 marks (ii)1Etwo or more letters = 0 marks (iii)1Btwo or more letters = 0 marks (b) (i)1mixture because it contains salt and waterAccept mixture because it can be separated (ii)1compound because it contains two elements joined togetherAccept compound because sodium and chlorine are joined Accept compound because it has the formula NaCl Total 5 Question 12 Part Mark Answer Further Information (a)2 attract(ing) opposite poles / a N and a S / a north (pole) and a south (pole)Ignore join together (b)2 repel(ling) like poles / a N and a N / two north (poles)Ignore push apart Total 4 Question 13 Part Mark Answer Further Information (a)1 to withstand pressure / stop it bursting Accept contains high pressure blood (b)1 so they can stretch / allow a pulse / keep them flexible Total 2

10 S/S8/MS © UCLES 2018 Question 14 Part Mark Answer Further Information 1 R Accept label line to correct position Total 1

11 S/S8/MS © UCLES 2018 [Turn over Stage 8 Paper 2 Mark scheme Question 1 Part Mark Answer Further Information (a)1 protein / fibre / mineral(s) / vitamins / named vitamin (other than vitamin C)Accept water (b) (i)1 fat (ii)1 carbohydrate (c)1 vitamin C destroyed by heating / vitamin C decomposed by cookingAccept part of potato that contains the vitamin C is cut away from potato before cooking / skin is removed prior to cooking / vitamin C dissolves in water / vitamin C evaporates Total 4 Question 2 Part Mark Answer Further Information 1A to Emore than one answer circled = 0 marks Accept other indications of correct answer but circle takes precedence Total 1 Question 3 Part Mark Answer Further Information 2 refracted / refraction the speed of light changes / the (ray of) light slows downAccept the (ray of) light changes direction / bent Accept glass is denser than air / there is a change of medium Do not accept the ray of light speeds up Total 2

12 S/S8/MS © UCLES 2018 Question 4 Part Mark Answer Further Information (a)1 increasesAccept goes up (b)1 decreasesAccept goes down (c)1 decreasesAccept goes down Total 3 Question 5 Part Mark Answer Further Information 3 1. true 2. false 3. false 4. false 5. false 6. trueall six correct = 3 marks four or five correct = 2 marks two or three correct = 1 mark one correct = 0 marks Total 3 Question 6 Part Mark Answer Further Information (a) (i)1 mass of saltAccept concentration of salt / amount of salt / grams of salt (ii)1 volume of water / time nail left in water / temperatureAccept type of nail / size of nail Accept mass of water / amount of water (iii)1 the more salt the rustier the nailAccept salt speeds up rusting (b) (i)1 oxygenAccept O 2 if name and formula used both must be correct (ii)1 little water / water cannot enterAccept no air can get in / no oxygen can get in Total 5

13 S/S8/MS © UCLES 2018 [Turn over Question 7 Part Mark Answer Further Information (a)2 group A (mass) increases (quickly) group B (mass) increases then (mass) decreases / (mass) increases slower than AAccept goes up each correct answer = 1 mark (b)2 group A (mass) increases and then (mass) decreases group B (mass initially stays constant / decreases and then) increasesAccept goes down each correct answer = 1 mark Total 4 Question 8 Part Mark Answer Further Information (a)1 protractor (b)2 angle A in angle B in correct headings = 1 mark Accept in degrees Accept incident angle for angle A / refracted angle for angle B enough space in table for 6 results = 1 mark horizontal lines not needed within table Total 3

14 S/S8/MS © UCLES 2018 Question 9 Part Mark Answer Further Information (a)1 oxygenAccept other indication of correct answer but circle takes precedence two or more answers = 0 marks (b)2 decreases decreasesAccept increases and increases = 1 mark Accept stays the same and stays the same = 1 mark (c)1 amount of carbon dioxide temperature amount of water colour of light pHAccept amount of chlorophyll Accept minerals Total 4

15 S/S8/MS © UCLES 2018 [Turn over Question 10 Part Mark Answer Further Information (a)1 has more than one type of element (bonded together)Accept has copper and chlorine (bonded together) Accept has more than one type of atom Do not accept a mixture of elements or a mixture of copper and chlorine (b)1 Chlorine is a solid at room temperature because it has a high melting point. Chlorine conducts electricity because its molecules are close together. Chlorine is a gas at room temperature because it has a low boiling point.  Chlorine conducts heat because its molecules are far apart. Accept other indication of correct answer but tick takes precedence if more than one tick = 0 marks (c)1 good conductor of heat / high melting pointIgnore cooks food quickly / good conductor / good electrical / conductor / strong / malleable / shiny (d)1 (very) strong Total 4

16 S/S8/MS © UCLES 2018 Question 11 Part Mark Answer Further Information (a)2 (copper) wire wrapped around iron rod correct circuit to pass current through wireAccept diagram or circuit diagram or mix of diagram and circuit diagram Ignore switches for two marks the electromagnet must work (b)1 can be turned off (and on)Accept is not always on Total 3 Question 12 Part Mark Answer Further Information 3 oxygen in the air oxygen in the blood nose trachea bronchus bronchiole alveolus nose correct = 1 mark trachea, bronchus and bronchiole correct = 1 mark alveolus correct = 1 mark Total 3

17 S/S8/MS © UCLES 2018 [Turn over Question 13 Part Mark Answer Further Information 1 calcium  calcium + carbon carbonate oxide dioxidecalcium oxide and carbon dioxide can be in either order Accept correct formulae but words take precedence calcium carbonate is CaCO 3 calcium oxide is CaO carbon dioxide is CO 2 Total 1 Question 14 Part Mark Answer Further Information 2Any two from Gabriella has lower resting pulse Gabriella’s pulse does not rise as much Gabriella’s maximum heart rate is less than Blessy’s Gabriella’s pulse returns to normal faster / recovery time is shorterAccept converse comparative statements about Blessy statements must be comparative Total 2

18 S/S8/MS © UCLES 2018 Question 15 Part Mark Answer Further Information 3 260 (s) 1500 or distance 260 time 5.8 (m / s)1 mark Accept ecf from incorrect world record time 1 mark Accept ecf from incorrect distance used in equation or from incorrect world record time but final answer must be 2 significant figures correct answer on answer line with or without workings = 3 marks any answer that rounds to 5.8 / 5.7 / 6 = 2 marks Total 3 Question 16 Part Mark Answer Further Information (a)1 beryllium oxideIgnore chemical formulae (b)2 two (or more) different atoms / two (or more) elements chemically joined / bonded togethereach correct idea = 1 mark Do not accept a mixture Accept cannot be separated by physical means = 2 marks Total 3

19 S/S8/MS © UCLES 2018 Question 17 Part Mark Answer Further Information 2 S N correct field lines, none crossing, at least one above and one below magnet = 1 mark at least one arrow must be drawn but if more than one drawn they must all be in the correct direction = 1 mark Total 2

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