[PDF] Cambridge Lower Secondary Progression Test - Science 2018 Stage 9 - Mark Scheme.pdf | Plain Text

Cambridge Lower Secondary Progression Test Science mark scheme Stage 9 SCIENCE_S9_MS_8RP © UCLES 2018

2 S/S9/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/S9/MS © UCLES 2018 [Turn over Stage 9 Paper 1 Mark scheme Question 1 Part Mark Answer Further Information (a)2 water and carbon dioxide correctly placed in first half of equation = 1 mark oxygen and glucose correctly placed in second half of equation = 1 markreactants in either order products in either order Accept oxygen and sugar / carbohydrate Accept balanced or unbalanced symbol equations Accept mix of names and formulae If name and formula given ignore any incorrect formulae Correct formulae are water, H 2O, carbon dioxide, CO 2, glucose, C 6H12O6 and oxygen, O 2 Ignore chlorophyll / light / enzymes if written over arrow but do not accept if given as reactant or product ++ water carbon dioxide oxygen glucose (b)1 leaves contain less chlorophyll / (idea of) white parts do not photosynthesise / leaves contain fewer chloroplastsAssume answer refers to variegated leaves Accept (idea that) chlorophyll is needed for photosynthesis Accept less photosynthesis in variegated leaves Accept ora if green leaves specified Total 3

4 S/S9/MS © UCLES 2018 Question 2 Part Mark Answer Further Information (a)2 Between 0 and 48 seconds the volume of gas increases . After 48 seconds the reaction stops / ends / finishes .Accept gets bigger / goes up Accept changes from 0 to 46 (cm 2) Accept does not take place (b)1 decreases / gets smallerAccept slows down / reduces (c)2Any two from particles have more energy particles move faster more collisionseach idea = 1 mark more frequent collisions / more successful collisions / more fruitful collisions / more energetic collisions = 2 marks Total 5 Question 3 Part Mark Answer Further Information (a) (i)1 collecting equipment type of insect to be sampled pitfall traps pooters sweep netsflying insects insects crawling on plants insects in leaf litter which are active at night Accept line from pooter to insects in leaf litter which are active at night (ii)1 take more samples / repeat / take random samples / sample at different times Ignore reference to fair test / improve accuracy (iii)1 could transfer microbes from one student to another / bacteria from one student to another / the tube may be sharp / tube may cut mouthAccept risk of infection (b) (i)2 / caterpillar / leaf / beetle three organisms correct = 1 mark correct arrows = 1 mark (ii)2 dish 1 beetle dead / leaf uneaten / beetles do not eat leaves / beetles are not herbivores dish 2 caterpillar (half) eaten / beetle is a carnivore / beetle is a predator / caterpillar is prey dish 3 leaf eaten / caterpillar eats leaves / caterpillar is a herbivorethree correct reasons = 2 marks two correct reasons = 1 mark Total 7

5 S/S9/MS © UCLES 2018 [Turn over Question 4 Part Mark Answer Further Information (a)3 circuit parallel series does not work A  B  C  D  E  all five correct = 3 marks three or four correct = 2 marks two correct = 1 mark Ignore tick under series for circuit C (b)2D and E voltage (across each lamp) is the same / same p.d. (across each lamp)both required in either order Accept same current / same power / same energy Total 5 Question 5 Part Mark Answer Further Information (a) (i)1CaAccept calcium but symbol takes precedence (ii)1CAccept carbon but symbol takes precedence (b) 1NeAccept neon but symbol takes precedence (c) (i)13Accept Group 13 (ii)15 Total 5 Question 6 Part Mark Answer Further Information (a)1A and Dboth correct = 1 mark (b)2 select the spotted and striped fish / remove the fish that just have stripes or just have spots breed them togethereach correct answer = 1 mark Accept select G / remove E and F Total 3

6 S/S9/MS © UCLES 2018 Question 7 Part Mark Answer Further Information (a)3 density = mass volume 12 / 3.2 3.75 (g / cm 3)each correct step = 1 mark Accept 12 / 3.2 = 2 marks Accept 3.75 with no working out = 3 marks (b)1g / cm 3 Accept g cm −3 or g per cc or g per ml or g / ml or g / cc or g per cm 3 Total 4 Question 8 Part Mark Answer Further Information (a)2 copper and lead chloride lead and silver nitrate  magnesium and sodium chloride tin and copper chloride  zinc and magnesium nitrate all correct = 2 marks one correct = 1 mark two correct and one incorrect = 1 mark two incorrect = 0 marks (b) (i)1 potassium / sodiumAccept magnesium / lithium (ii)2 calcium calcium hydroxide + water + hydrogenreactants correct = 1 mark Accept reactants in any order Accept Ca + H 2O products correct = 1 mark Accept products in any order Accept Ca(OH) 2 + H 2 Accept correct formulae but words take precedence Total 5

7 S/S9/MS © UCLES 2018 [Turn over Question 9 Part Mark Answer Further Information (a)1 particles / moleculesAccept atoms (b)1 (direction of) movement (c)2Any two from high(er) energy particles escape the process is endothermic / evaporation takes in energy energy is required to overcome force of attraction between particles low(er) energy particles are left behindeach correct idea = 1 mark (maximum two marks) at least one marking point must involve particles Total 4 Question 10 Part Mark Answer Further Information (a) (i)1 The amount of carbon dioxide increases and the amount of oxygen decreases Accept other words for increases and decreases, e.g. gets bigger or gets smaller (ii)1 (idea of) less photosynthesis (b)2Any two from loss of cover loss of food loss of shelter loss of nesting sites disturbanceIgnore references to pollution Accept loss of habitat if no other mark awarded Total 4 Question 11 Part Mark Answer Further Information 2 filtration crystals / salt / calcium nitrate / solid Total 2

8 S/S9/MS © UCLES 2018 Question 12 Part Mark Answer Further Information (a) (i)1 100 (N / m2) (ii)1 goes down / decreases / less (b)1 4 (m 2) Total 3

9 S/S9/MS © UCLES 2018 [Turn over Stage 9 Paper 2 Mark scheme Question 1 Part Mark Answer Further Information (a) (i)2 this range gives the best combination of high element levels below pH 4 lots of elements are in short supplyAccept has most nitrogen / phosphorus / potassium / magnesium Accept has least or no nitrogen / least or no phosphorus / least or no potassium / least or no magnesium (ii)1 ironAccept any indication of answer but answer line takes precedence (b) (i)1 decomposersAccept bacteria / fungi / microbes / microorganisms (ii)1 (recycles or releases or provides) minerals / nutrients Accept (recycles or releases or provides) nitrogen / phosphorus / potassium / magnesium / nitrates / ammonium compounds / phosphate Total 5 Question 2 Part Mark Answer Further Information 2 The part labelled A in the diagram is the pivot / fulcrum . Z is called a moment .each correct sentence = 1 mark Total 2

10 S/S9/MS © UCLES 2018 Question 3 Part Mark Answer Further Information (a)1Any one from wear eye protection / wear gloves / wear lab coat / only use small amount of metal / safety screen / carry it out in a fume hoodAccept local name for eye protection, e.g. safety goggles (b)1 hydrogenAccept any indication of answer but circle takes precedence (c) (i)1 potassium / K (ii)1 burst into flames / explodes / fizzes / makes a gas / floats on water Accept makes hydrogen / makes rubidium hydroxide / melts / heat released Ignore colour of flame Total 4 Question 4 Part Mark Answer Further Information 1 statement order the touch screen pushes onto the plate behind 3 the charge on this part of the plate changes 4 you choose the letter you want on the phone(1) the change in charge is detected by the digital sensor 5 you touch the screen with your finger 2 all in correct place = 1 mark Total 1

11 S/S9/MS © UCLES 2018 [Turn over Question 5 Part Mark Answer Further Information 2 observation conclusion Offspring of a species have small differences. The small differences make some offspring better adapted than others. Over time the population of a species stays roughly the same. The small differences are inherited. The small differences can be seen in the parent and the offspring. Darwin called this evolution. Over time, the appearance of a species changes. The weakest die and the best adapted survive. all four correct = 2 marks two or three correct = 1 mark one correct = 0 marks Do not accept one observation to two conclusions Total 2 Question 6 Part Mark Answer Further Information (a) (i)1 Dalton (ii)1 6 (years) (b)1Any one from (idea of) other scientists have provided new evidence (idea that) new explanations given to same evidence Total 3

12 S/S9/MS © UCLES 2018 Question 7 Part Mark Answer Further Information (a)2 pie-chart all data adds up to 100%Accept bar chart because not a continuous variable = 1 mark (b)2Any two from data may have changed / data has changed (idea that) data does not show the percentages of the different energy sources today / data only shows the information for 2008 only shows information for the USAAccept specific examples, e.g. more renewables (c)1 solar / wind / geothermal / biomassAccept Sun / biofuel / water / tidal / wave / hydroelectric (d)1 (coal is a) finite resource / made slower than it is used up / not made as conditions not same a millions of years agoAccept one day coal will run out Accept cannot be replaced in a short time Accept takes millions of years to make Ignore it cannot be used again Total 6 Question 8 Part Mark Answer Further Information (a)2Any two from reproduction / disease / famine / loss of habitat / competition / adverse climate / drought / pollutionAccept named diseases / lack of food source (b)1B and there are fewer predators than prey / the predators lag the preyNo marks for B without an explanation Accept there are fewer foxes than rabbits / the foxes lag the rabbits Total 3

13 S/S9/MS © UCLES 2018 [Turn over Question 9 Part Mark Answer Further Information (a)1 (concentration) 3 / (volume) 29 look to see if the data is circled in the table if answer line is blank (b)1 repeat the experimentAccept take averages / means (c)1 Replace the acid with an alkali. Replace the conical flask with a beaker. Use a gas syringe instead of a measuring cylinder.  Use iron instead of magnesium. more than one tick = 0 marks Total 3 Question 10 Part Mark Answer Further Information 3 current voltage unitamps volts ............................. measured withammeter in series voltmeter............................. in parallel............................. circuit symbol for the measuring device A V each correct cell = 1 mark both voltmeter and parallel needed for 1 mark Total 3

14 S/S9/MS © UCLES 2018 Question 11 Part Mark Answer Further Information (a)3 style ovary stigma each correct label = 1 mark (b)3 fertilisation pollination dispersaleach correct process = 1 mark Total 6 Question 12 Part Mark Answer Further Information (a)1 exothermic (b) (i)1 hydrogenAccept H 2 Ignore H If name and formula given both must be correct (ii)1 magnesium chlorideAccept other ways of indicating answers but circle takes precedence (c)1 calciumAccept other ways of indicating answers but circle takes precedence Total 4

15 S/S9/MS © UCLES 2018 Question 13 Part Mark Answer Further Information (a)1 0–1 g 1–5 g 1–20 g  20–100 g two or more ticks = 0 marks (b)1 as mass of salt or mass of salt solution increases the volume increasesAccept ora Accept as mass of salt increases mass of solution increases must refer to both variables (c)1 results more reliable / can check results / easier to spot anomalous resultsDo not accept to improve accuracy or precision Ignore fair test Total 3 Question 14 Part Mark Answer Further Information 1 roundworm Total 1 Question 15 Part Mark Answer Further Information (a)1 electron (b)131Accept 15 protons and 16 neutrons Total 2 Question 16 Part Mark Answer Further Information (a)1 radiationAccept any indication of answer but circle takes precedence (b)1 (idea that) radiation can travel in space / conduction and convection need matterAccept vacuum for space Total 2

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