Cambridge Lower Secondary Checkpoint
SCIENCE
1113/01
Paper 1
April 2021
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
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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
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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
1113/01
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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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
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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
1113/01
Checkpoint Lower Secondary – Mark Scheme
PUBLISHED
Question
6(a)
6(b)
7
Answer
Marks
have the same pitch
3
trace A
trace B
trace A
trace B
trace A
trace B
have the same loudness
trace A
trace B
have the same amplitude
all four correct = 3 marks
two correct = 1 mark
one correct = 0 marks
1
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
have the same frequency
makes them move
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
1113/01
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
© UCLES 2021
Page 14 of 14
April 2021