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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
1113/01
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
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Page 3 of 14
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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
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Page 4 of 14
1113/01
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
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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
Page 5 of 14
1113/01
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)
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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
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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)
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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
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Page 9 of 14
1113/01
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
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Page 10 of 14
1113/01
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
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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
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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)
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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
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Page 14 of 14
April 2021