Science
Stage 7
Paper 2
Cambridge Lower Secondary Progression Test
Mark Scheme
3144_02_MS_4RP
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2023
3144/02
Science Stage 7 Paper 2 Mark Scheme
2023
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 12
Question
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2(b)
2(a)
1(b)
1(a)
Question
3144/02
Page 3 of 12
(idea that) particles in gases move freely and/or quickly (so
can fill the container)
Accept (idea that) particles in a solid can only
vibrate but particles in a gas can move from one
location to another = 2 marks
2 each correct answer = 1 mark
Accept particles in solids are more tightly packed
/ ora = 2 marks
(idea that) particles in solids are tightly packed (so no space
to squeeze them closer together)
(idea that) particles in solids cannot move freely (other than
to vibrate)
Accept gases have larger spaces between
particles / ora = 2 marks
2 each correct answer = 1 mark
Further Information
Accept do not show all the characteristics of
living organisms
1 Accept no reproduction without a host cell
2023
(idea that) gases have (large) spaces between particles (so
can be squeezed closer together)
Answer
(idea that) no respiration or no excretion or no nutrition or
no growth or no sensitivity or no (independent) movement
Do not accept breathing
(5) respiration or respiring
Ignore nutrition
Accept irritability
(4) sensitivity
4 each correct answer = 1 mark
Further Information
Accept breeding
Marks
Marks
(3) reproduction or reproducing
(2) growth or growing
(1 excretion)
Answer
Science Stage 7 Paper 2 Mark Scheme
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amp(s) or ampere(s)
4(c)
Answer
Page 4 of 12
Marks
Further Information
2023
Accept any indication of the correct answer, e.g.
writing next to question, but answer in table takes
precedence
1 Accept A
1
complete circuit with no breaks = 1 mark
two correct symbols = 1 mark
Accept cell either way round
2 Accept symbol for battery of cells
Accept CO2
Accept H2 or H
3 each correct answer = 1 mark
Further Information
(Gas C is) carbon dioxide
ammeter
Question
Marks
Accept O2 or O
Answer
Science Stage 7 Paper 2 Mark Scheme
(Gas B is) hydrogen
(Gas A is) oxygen
4(b)
4(a)
3
Question
3144/02
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4(e)
4(d)
Question
3144/02
0
2
4
6
0
1
3
number of lamps
2
4
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(idea that) as the number of lamps increases the current
decreases / ora
current
in amps
8
10
12
Answer
5
Marks
Science Stage 7 Paper 2 Mark Scheme
1
straight line of best fit for their plots judged by eye
= 1 mark
Accept plots shown as small cross, dot or dot
with circle
all points plotted correctly (±1/2 square) =
1 mark
both axes labels correct = 1 mark
3 Accept ecf from (c) for unit
Further Information
2023
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5(b)
Page 6 of 12
(the model) does not show flowing water, e.g. rivers,
streams, etc.
(the model) does not show clouds
(the model) does not show groundwater
(the model) does not show water run-off
any two from
2023
Accept does not show aquifers or does not show
water underground
2 each correct answer = 1 mark
Accept no condensation
(idea that) rate of condensation is very low
(idea that) the temperature difference between the water
vapour and the plastic sheet is very small
Accept no evaporation
2 each correct answer = 1 mark
1
Further Information
(idea that) rate of evaporation is very low
Marks
Accept no water vapour inside the beaker
any two from
5(a)(ii)
Answer
Science Stage 7 Paper 2 Mark Scheme
(idea that) less water vapour inside the beaker
condensation
5(a)(i)
Question
3144/02
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6
Question
3144/02
group of organs working together
group of tissues working together
to do the same function
group of cells working together
to do the same function
description
Answer
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diagram
Science Stage 7 Paper 2 Mark Scheme
Further Information
if two lines from one description
and one is incorrect = 0 marks
for that description
one or two lines correct = 1 mark
2 all three lines correct = 2 marks
Marks
2023
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7
Question
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Page 8 of 12
Accept in the air and in the vacuum the stone
takes the same time to fall
in the air the feather experiences more air resistance than
the stone / ora
in the vacuum there is no air resistance
Accept in the vacuum the stone and feather take
the same time to fall to the bottom
in the vacuum the stone and feather fall at the same speed
3 each correct answer = 1 mark
Further Information
Accept in the air the stone takes less time to fall
to the bottom than the feather / ora
Marks
2023
in the air the stone falls faster than the feather / ora
any three from
Answer
Science Stage 7 Paper 2 Mark Scheme
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8(c)
(diagram) C
8(b)
Answer
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(idea that) the Moon is in the Earth's shadow
C
Marks
Science Stage 7 Paper 2 Mark Scheme
(explanation idea that) has gravity from both the Sun and
Moon pulling in same direction
gravity
8(a)
Question
3144/02
Accept any indication of the correct answer,
e.g. ticking or underlining, but circling takes
precedence
2 each correct answer = 1 mark
2 each correct answer = 1 mark
1 Accept gravitational force
Further Information
2023
thermometer
(idea that) the temperature in composter B is still increasing
(idea that) need to keep recording temperature until the
temperature starts decreasing
spot anomalies or check results or more reliable
9(b)(i)
9(b)(ii)
9b(iii)
9(iv)
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microorganism(s) or decomposer(s)
9(a)(ii)
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decomposition
Answer
Marks
Science Stage 7 Paper 2 Mark Scheme
9(a)(i)
Question
3144/02
Do not accept fair test
Ignore get more accurate results
1 Accept more valid results or able to calculate an
average or to be sure of the results or compare
results or more consistent
1 Ignore repeat investigation
1
1 Accept temperature probe
1 Accept bacteria or fungi
Ignore moldy
1 Accept decay or rotting
Further Information
2023
Question
Question
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12(b)
12(a)
11
10
Question
3144/02
Marks
low density
brittle
dull
any two from
good conductor of electricity
high melting point
Answer
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(explanation idea that) sound waves travel in the air and
make the rubber sheet vibrate
(description) rice moves
Marks
Accept poor ductility
2 each correct answer = 1 mark
2 each correct answer = 1 mark
Further Information
Accept (idea that) particles in the air vibrate and
make the rubber sheet vibrate
2 each correct answer = 1 mark
Further Information
Accept makes a new substance as an alternative
to makes a gas
(F) makes a gas
3 both letters needed any order for the mark
Further Information
each correct explanation = 1 mark
Answer
Marks
2023
(D) changes colour
(powders) D and F
Answer
Science Stage 7 Paper 2 Mark Scheme
3144/02
Science Stage 7 Paper 2 Mark Scheme
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