Download [PDF] October 2018 CAIE P1 Mark Schemes 1113 Science Cambridge Lower Secondary Checkpoint

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[PDF] October 2018 CAIE P1 Mark Schemes 1113 Science Cambridge Lower Secondary Checkpoint.pdf | Plain Text

This document consists of 11 printed pages. IB18 10_1113_01/3RP © UCLES 2018 [Turn over Cambridge International Examinations Cambridge Secondary 1 Checkpoint SCIENCE 1113/01 Paper 1 October 2018 MARK SCHEME Maximum Mark: 50 Published This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Markers were instructed to award marks. It does not indicate the details of the discussions that took place at an Markers’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the End of Series Report. Cambridge will not enter into discussions about these mark schemes.

1113/01 Checkpoint Secondary 1 Science – Mark Scheme October 2018 PUBLISHED © UCLES 2018 Page 2 of 11   Annotations and abbreviations / OR alternate responses for the same marking point ( ) the words or units in brackets do not need to be stated 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, however, full marks can still be achieved even with the 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 note provides extra information when necessary

1113/01 Checkpoint Secondary 1 Science – Mark Scheme October 2018 PUBLISHED © UCLES 2018 Page 3 of 11 Question Answer Marks Further Information 1(a) cell wall 1 1(b) has a cell wall could be a plant cell / has a (large) vacuole could be a plant cell lacks chloroplasts could be an animal cell 2Accept has structure X so could be a plant cell Accept animal cells do not have a cell wall Question Answer Marks Further Information 2(a)(i) found in the bottom layer (that contains fossils) / layer D is at the bottom / layer D is the deepest (that contains fossils) 1 2(a)(ii) sandstone 1 2(b) Metamorphic rocks form when other rocks are changed by heat and pressure . 2 either order

1113/01 Checkpoint Secondary 1 Science – Mark Scheme October 2018 PUBLISHED © UCLES 2018 Page 4 of 11   Question Answer Marks Further Information 3 (N) S N S S 2four correct = 2 marks two or three correct = 1 mark Ignore any labels unless the boxes are empty Question Answer Marks Further Information 4(a) pollen 1 4(b) pollination 1Ignore cross or self 4(c) fertilisation 1

1113/01 Checkpoint Secondary 1 Science – Mark Scheme October 2018 PUBLISHED © UCLES 2018 Page 5 of 11 Question Answer Marks Further Information 5(a) + + iron copper sulfate iron sulfate copper 2 correct reactants (either order) = 1 mark correct products (either order) = 1 mark 5(b) most reactive zinc iron least reactive copper 1all correct = 1 mark 5(c) exothermic 1 5(d) measure the temperature (before adding the metal) measure the temperature after adding the metal 2Accept measure the temperature change = 2 marks Accept measure the temperature over time = 2 marks

1113/01 Checkpoint Secondary 1 Science – Mark Scheme October 2018 PUBLISHED © UCLES 2018 Page 6 of 11 Question Answer Marks Further Information 6 At A the wave has the highest amplitude . At A and B the wave has the same frequency . 2each correct sentence = 1 mark Question Answer Marks Further Information 7(a) thermometer stopwatch / clock / timer 2 7(b) any one variable from (same) external temperature / (same) temperature of surroundings (same) sized tubes / (same) amount of water / (same) material for tubes / (same) volume of water (same period of) time (same) starting temperature of water explanation ‘fair test’ / eliminate effect of other variables / so results can be compared 2 Accept in draught free conditions Accept (same) type of test-tube marking point 2 is not dependent on marking point 1 Accept explanation of not controlling the variable given

1113/01 Checkpoint Secondary 1 Science – Mark Scheme October 2018 PUBLISHED © UCLES 2018 Page 7 of 11 Question Answer Marks Further Information 8(a) D could be squashed (in the syringe) / only gases can be compressed 2 note marking point 2 dependent on correct letter 8(b) A and C then any one from (idea that) could not fill the syringe with the substance did not take on the shape of the beaker 2both correct = 1 mark Note second marking point dependent on correct letters Accept have a fixed shape / maintain their shape

1113/01 Checkpoint Secondary 1 Science – Mark Scheme October 2018 PUBLISHED © UCLES 2018 Page 8 of 11 Question Answer Marks Further Information 9(a) yes explanation: the green boxes have densities 7.2 9.8 and 6.4 = 1 mark the largest density for a red box is 6.3 = 1mark but all the densities of green boxes are higher than the densities of the red boxes / the average density of green boxes is higher than the average density of the red boxes = 2 marks 2no mark for just stating that the statement is correct if answer is no = 0 marks note the explanation must involve use of the data in the table and not just restate the statement Accept the total density of the green boxes is higher than the total density of the red boxes = 2 marks 9(b) no explanation: A is the largest box / the density of the largest box is 1.2 1.2 is the lowest density / other boxes have a higher density 2 no mark for just stating that the prediction is wrong if answer is yes = 0 marks each correct explanation = 1 mark Accept the largest box has a volume of 15 cm 3 Accept D has the highest density and lowest volume / A has the largest volume but the smallest density = 2 marks

1113/01 Checkpoint Secondary 1 Science – Mark Scheme October 2018 PUBLISHED © UCLES 2018 Page 9 of 11 Question Answer Marks Further Information 10 They all eat the same food. They can all breed with each other.  They share similar features. They live in the same habitat. Their offspring would all be able to have young.  2two correct ticks = 2 marks only one tick = 1 mark if correct two correct ticks and one incorrect tick = 1 mark one correct tick and two incorrect ticks = 0 mark four or five ticks = 0 marks Question Answer Marks Further Information 11(a) electron(s) 1 11(b) has 4 electrons in outer shell 1Accept 4 electrons on outer ring Accept 4 electrons in the valence shell / 4 valence electrons 11(c) get bigger / gets larger / increases 1Ignore heavier

1113/01 Checkpoint Secondary 1 Science – Mark Scheme October 2018 PUBLISHED © UCLES 2018 Page 10 of 11   Question Answer Marks Further Information 12 2 each correct colour in correct box = 1 mark Note these are the only acceptable colours   Question Answer Marks Further Information 13(a) A = otter B = pike C = water fleas and D = mosquito larvae 3 both required water fleas and mosquito larvae can be either way round 13(b) reduce numbers of fish by otters eating the perch 2Accept pike have less food and starve Accept otters eat fish / otters are predators of perch otters are predators of fish / otters kill perch or fish (yellow) cyan magenta green red blue

© UCLES 2018 Page 11 of 11     Question Answer Marks Further Information 15(a) y axis – voltage in V and x axis – length in cm correct plots seen for (40,0.28) and (50,0.22) 2Accept voltage / V Accept voltage with V in brackets Accept length / cm Accept length with cm in brackets both axes required for 1 mark needs both label and the unit plots correct to half a small square Ignore any attempt at line of best fit or joining the plots 15(b) Anomalous reading 30 or 0.35 they should (idea of) repeat the reading 2Accept third one Question Answer Marks Further Information 14(a) Mercury and Venus 1both required in either order 14(b) reflects light from the Sun 1