05 1113 01 MS 3RP AFP tcm143-623073 [PDF]

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Cambridge Lower Secondary Checkpoint SCIENCE



1113/01 April 2021



Paper 1 MARK SCHEME Maximum Mark: 50 Published



This mark scheme is published as an aid to teachers and learners, to indicate the requirements of the examination. However, we have not been able to adjust it to reflect the full range of answers that would have been seen as a part of the normal moderation and marking process, and it does not necessarily contain all the possible alternatives that might have arisen. Cambridge will not enter into discussions about the mark scheme.



This document has 14 pages. IB21 05_1113_01/3RP © UCLES 2021



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1113/01



Checkpoint Lower Secondary – Mark Scheme PUBLISHED



April 2021



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 2021



Page 2 of 14



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Checkpoint Lower Secondary – Mark Scheme PUBLISHED



Question



Answer



1(a) A 1(b) 1(c)



A



B B



C C



April 2021 Marks



D



D



Further Information



1



more than one answer circled = 0 marks



1



more than one answer circled = 0 marks



1



both needed for the mark either order



E E



mouth and stomach



Accept throat / pharynx for mouth Ignore nose / nasal cavity



© UCLES 2021



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Checkpoint Lower Secondary – Mark Scheme PUBLISHED



Question 2(a)



Answer



April 2021



Marks



Rock A is sedimentary rock.



2



Further Information all three correct = 2 marks one or two correct = 1 mark



Rock B is igneous rock. Rock C is metamorphic rock. 2(b)



any two from



2



each correct answer = 1 mark Accept sediment / mud / sand



(small) particles of rock sink to bottom of seas or lakes



Accept under high pressure compacted grains or rock particles stick together



compressed / cemented



© UCLES 2021



Page 4 of 14



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Checkpoint Lower Secondary – Mark Scheme PUBLISHED



Question 3(a)



Answer



April 2021 Marks 2



Jupiter Mars



Further Information each correct tick = 1 mark but



the Sun







North Star







two correct ticks and one incorrect tick = 1 mark



the Earth’s Moon



one correct tick and one incorrect tick = 1 mark two incorrect ticks included in answer = 0 marks



3(b) 3(c)



Copernicus Earth



Question 4



© UCLES 2021



Darwin



Jupiter



Galileo Neptune



Rutherford



Venus



Answer



1



more than one answer circled = 0 marks



1



more than one answer circled = 0 marks



Marks 2



Further Information all five correct = 2 marks



Scientific name



letter



Buccinum



C



two, three or four correct = 1 mark



Ensis



D



Mytilus



B



one correct = 0 marks



Ostrea



E



Patella



A



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Checkpoint Lower Secondary – Mark Scheme PUBLISHED



Question



Answer



April 2021 Marks



Further Information



5(a)



11



1



5(b)



8



1



5(c)(i)



F



1



Accept fluorine



1



all three correct = 1 mark



5(c)(ii)



© UCLES 2021



Page 6 of 14



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Checkpoint Lower Secondary – Mark Scheme PUBLISHED



Question 6(a)



6(b)



trace A



trace B



7



Answer



Marks



have the same pitch



3



trace B



trace A



trace B



have the same loudness



trace A



trace B



have the same amplitude



have the same frequency



all four correct = 3 marks



two correct = 1 mark one correct = 0 marks



1



makes them move



Answer any two from choose parents with the desired characteristics and mate them together / choose A and B and mate them together select offspring with the desired combination of features use the offspring to produce subsequent generations



© UCLES 2021



Further Information



three correct = 2 marks



trace A



Question



April 2021



Page 7 of 14



Accept makes them vibrate



Marks



Further Information



2



each correct answer = 1 mark Accept breed / cross / cross-breed / reproduce instead of mate



1113/01



Checkpoint Lower Secondary – Mark Scheme PUBLISHED



Question



Answer



April 2021



Marks



8(a)



48 (cm3)



1



8(b)



to ensure his results are reliable



1



Further Information



Do not accept to get more accurate results / for a fair test Accept reduce errors / check results / to get an average



8(c)



1



wear goggles or eye protection / wear gloves



Accept wear lab coat / protective clothing Ignore face masks



8(d) 8(e)



© UCLES 2021



bar graph



line graph



pie chart



scatter graph



do preliminary work / try out different concentrations / double the concentration



Page 8 of 14



1 1



more than one answer circled = 0 marks



1113/01



Question



Checkpoint Lower Secondary – Mark Scheme PUBLISHED Answer



April 2021



Marks



9(a)(i)



The difference between the two containers is the surface / A is dull and B is shiny .



1



9(a)(ii)



The water cools faster in container A because the container is a better radiator.



1



9(b)



water in C is hotter / water in A is cooler



1



Further Information Accept only A is dull / only B is shiny



Assume unqualified answers refer to C Accept ora for A



9(c)



greater surface area / more convection / more radiation / more conduction / more evaporation



1



Assume unqualified answers refer to D Note the answer must be comparative Accept ora for A



© UCLES 2021



Page 9 of 14



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Checkpoint Lower Secondary – Mark Scheme PUBLISHED



Question



Answer



10(a)



April 2021 Marks



adaptation



reason



large ears



pull grass from ground



trunk



keep elephant cool



tusks



used to fight other elephants



1



10(b)(i)



East (Africa)



1



10(b)(ii)



any two from



2



Further Information all three correct = 1 mark



each correct answer = 1 mark



hunting / poaching habitat destruction disturbance Accept global warming



climate change / pollution



© UCLES 2021



Page 10 of 14



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Checkpoint Lower Secondary – Mark Scheme PUBLISHED



Question



Answer



11(a)



Marks



solids



liquids



gases



A



(B)



C



E



April 2021



3



one or two letters correct = 1 mark



D



any two from



any letter in more than one column is incorrect for that letter



2



each correct answer = 1 mark if no marks awarded accept (liquid) changes to a gas = 1 mark



(idea that) particles move further apart (idea that) particles move faster / gain energy (idea that) particles escape from liquid (idea that) forces between particles in liquid reduced / overcome



© UCLES 2021



all five letters correct = 3 marks three or four letters correct = 2 marks



F 11(b)



Further Information



Page 11 of 14



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Checkpoint Lower Secondary – Mark Scheme PUBLISHED



Question 12(a)



Answer



April 2021 Marks



any one from



Further Information



1 Accept insects / birds / bees for pollinators



to attract pollinators to create a landing platform for insects 12(b)



to produce pollen / produce male gametes



1



12(c)(i)



transfer of pollen (from bee to stigma)



1



12(c)(ii)



any two from



2



each correct answer = 1 mark



(pollen grain) develops a pollen tube male gamete moves down the style or pollen tube / male gamete moves to the ovary / pollen tube grows down the style / pollen tube grows towards the ovary male gamete fuses with ovule / male gamete joins the ovule / male gamete fuses or joins with female gamete fertilisation forms a zygote forms a seed



© UCLES 2021



Page 12 of 14



Accept nucleus for gamete throughout



1113/01



Checkpoint Lower Secondary – Mark Scheme PUBLISHED



Question



Answer



13(a) force / area



or



April 2021



Marks



Further Information



2



each correct answer = 1 mark correct answer on its own = 2 marks



500 / 400



1.25 (N / cm2) 13(b) 13(c)



© UCLES 2021



pressure increases



1



(very) high pressure / too much pressure / weight is acting through a small area



1



Page 13 of 14



Accept pressure is 50 (N / cm2) / pressure is 40 times bigger



1113/01



Checkpoint Lower Secondary – Mark Scheme PUBLISHED BLANK PAGE



© UCLES 2021



Page 14 of 14



April 2021