Cambridge Primary Checkpoint
SCIENCE
0846/02
October 2021
Paper 2
FINAL 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 the 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.
This document has 20 pages. Any blank pages are indicated.
IB21 10_0846_02_MS/6RP
© UCLES 21
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0846/02
Checkpoint Primary – Mark Scheme
PUBLISHED
October 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
Page 2 of 20
0846/02
Checkpoint Primary – Mark Scheme
PUBLISHED
Question
1(a)
Answer
October 2021
Marks
(idea that) group A can fly / have wings
Further information
1
or
(idea that) group B cannot fly / do not have wings
Accept answers without specifying A or B
e.g. ‘flying and not flying animals’ / ‘(does
it) fly’ / ‘(does it have) wings’ / fly and walk
Ignore group B have legs / group B walk /
land animals / terrestrial / how they travel
Do not accept feathers / whiskers /
swimming / backbone / tail
1(b)
group C
group D
(frog)
(snake)
gorilla
snail
1 all correct any order
Ignore frog and snake rewritten as long as
in the correct column
horse
1(c)
legs / no legs
1 Accept feet / no feet / limbs / no limbs /
toes / no toes
Ignore hands / arms / paws
Ignore description movement and how
they move, e.g. ‘how they travel’ / walk
and crawl / slither / drag
Page 3 of 20
0846/02
Checkpoint Primary – Mark Scheme
PUBLISHED
Question
2
Answer
mixture
October 2021
Marks
separation method
dissolve in water
and filter
iron powder and
aluminium powder
use a magnet
sand and salt
burn the mixture
salt solution
evaporate the
mixture
sand and water
melt the mixture
lumps of marble and
powdered marble
sieve the mixture
filter the mixture
Page 4 of 20
Further Information
5 each correct line = 1 mark
more than one line from a mixture
to different separation methods
= 0 marks for that mixture
0846/02
Checkpoint Primary – Mark Scheme
PUBLISHED
Question
Answer
Marks
3
1
N
3
K
I
L
O
W
Accept (for 1 down) N for newtons
N
G
R
A
M
3 each correct answer = 1 mark
Accept (for 3 across) grams or g or kg for
kilograms
O
F
Further Information
E
T
2
October 2021
S
R
C
E
Page 5 of 20
Accept answers written next to the clues,
but answers in the crossword puzzle take
precedence
0846/02
Checkpoint Primary – Mark Scheme
PUBLISHED
Question
4
Question
5
Answer
October 2021
Marks
part
function
flower
takes in light
leaf
for reproduction
root
transports water
stem
takes in water
Answer
2 all four correct = 2 marks
two or three correct = 1 mark
one correct = 0 marks
more than one line from a part to different
functions = 0 marks for that part
Marks
Copper sulfate is soluble in water.
Further Information
Further Information
3 all four words correct = 3 marks
Copper sulfate dissolves in water to form a blue solution.
Water is the solvent and copper sulfate is the solute.
Page 6 of 20
three words correct = 2 marks
two words correct = 1 mark
one word correct = 0 marks
0846/02
Question
Checkpoint Primary – Mark Scheme
PUBLISHED
Answer
October 2021
Marks
Further Information
1 both correct = 1 mark
6(a)
The platypus has thick fur to keep warm / not get cold / insulate /
protect it from the cold / trap in the heat.
The platypus has webbed feet to help it swim / paddle.
Ignore just ‘protect’ / camouflage / protect
from harsh or bad weather / waterproof
Accept move in water / move through
water
Ignore just ‘move’ / float on water / walk /
‘not sink in the snow’
2 each correct answer = 1 mark
6(b)
The platypus is camouflaged to help it hide from its predators /
escape from its predators / hide from its prey / blend in
with its environment.
Accept protected from its predator / avoid
predators / cover from predators / stay
safe from predators / don’t get hunted /
hide when hunting / so prey cannot see
then
Ignore just ‘hide’ / just ‘blend’ / just
‘survive’ / catch prey / hide from other
animals / just ‘don’t get eaten’ / just ‘hunt’
The platypus has a big beak to catch prey / grip prey.
Accept food for prey, e.g. grip food
Accept named prey, e.g. grip fish
Accept to take its food / collect food / take
in food / store food / help it reach food
Ignore eat or bite or smell prey / eat from
a distance / help it hunt / find food /
swallow lots of food / swimming
Page 7 of 20
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Checkpoint Primary – Mark Scheme
PUBLISHED
Question
7(a)
Answer
word
October 2021
Marks
meaning
dark shape that appears on a
surface when light is blocked
opaque
material that lets light through
reflects
material that stops light going
through
shadow
what happens to light when it
hits a mirror
Page 8 of 20
Further Information
2 all three correct = 2 marks
two correct = 1 mark
one correct = 0 marks
more than one line from a word box to
different meanings = 0 marks for that word
0846/02
Checkpoint Primary – Mark Scheme
PUBLISHED
Question
Answer
October 2021
Marks
Further Information
3 each correct answer = 1 mark
7(b)
light or sun(light) to flower
Ignore flower is covered by light
(light) reflects on/off flower
Accept light or sun(light) reflects off flower
= 2 marks
Ignore bounces
(then) light or sun(light) enters eye(s)
Accept light goes into her eye(s) / light
goes to her eye(s) / light goes in her
eye(s)
Accept correct ray diagram for marking
points:
light to flower = 1 mark
light enters eye = 1 mark
Ignore incorrect diagrams
Do not accept incorrect descriptions e.g.
the light goes into her eye and then to the
flower
Page 9 of 20
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Checkpoint Primary – Mark Scheme
PUBLISHED
Question
8
Answer
October 2021
Marks
sentence
true
Sound travels in air.

Sound does not travel in water.
false

Sound does not travel in a vacuum (no air).

2 all four correct = 2 marks
three or two correct = 1 marks

Sound travels in solids.
Further Information
Page 10 of 20
one correct = 0 marks
0846/02
Question
Checkpoint Primary – Mark Scheme
PUBLISHED
Answer
October 2021
Marks
Further Information
2 all five correct = 2 marks
9
three or four correct = 1 marks
one or two correct = 0 marks
Accept any length of arrow as long as
direction is correct
Do not accept any incorrect arrow /
arrows in different directions on hand
diagram
Accept arrows not from the large dot
Accept arrow for box on or beside rope,
arrow pointing to the right. Arrow needs to
be on or between overlay lines.
Accept arrow for weight picture that would
produce an upward movement
Accept arrow for trolley picture that would
produce a forward movement of the trolley
Accept arrow for hands that would bring
the hands together from different
directions (most arrows are acceptable as
do not know initial position of hands before
they moved together)
Page 11 of 20
0846/02
Checkpoint Primary – Mark Scheme
PUBLISHED
Question
10(a)
Answer
October 2021
Marks
Further Information
1 Accept whole room fills with gas
(diesel/liquid) changes to a gas/vapour
Accept correct examples of evaporation
e.g. water changes into water vapour
Ignore references to heat / boiling
Do not accept diesel changes into water
vapour / reference to steam / gas
evaporates
10(b)
1 Accept use a high(er) temperature / boil
(it) / boil at a higher temperature / put it in
a hot or sunny place / increase surface
area / increase in wind or add wind
heat (it) or increase the temperature
Ignore decrease the volume of amount
Do not accept make the boiling point
higher
10(c)
1 Accept condensing
condensation
Ignore cooling / distillation
Page 12 of 20
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Checkpoint Primary – Mark Scheme
PUBLISHED
Question
11
Answer
October 2021
Marks
any two from
Further Information
2 each correct answer = 1 mark
Accept stops her dying / help her survive
Ignore be healthy
keeps her alive
Accept filter waste / filter urine / filters
substances / takes her urine / removes her
urine / helps her to urinate / excretion
removes waste / makes urine
Ignore storing waste / bladder
Accept purifies the blood
Ignore transfers blood
cleans the blood / filters the blood
Accept filtering/cleaning blood to make
waste/urine = 2 marks
(idea that) it keeps the right amount of water in the body
Accept remove excess water from the
body / remove waste water from the body
Ignore working as a kidney / replacing her
kidney / does the job of the kidney
Page 13 of 20
0846/02
Checkpoint Primary – Mark Scheme
PUBLISHED
Question
12(a)
Answer
October 2021
Marks
D and F
Further Information
1 both needed for the mark in either order
more than letters D and F = 0 marks
12(b)
D
1 more than letter D = 0 marks
12(c)
not hard / it is soft
2 each correct answer = 1 mark
it is flexible
Do not accept not a liquid at room
temperature / a liquid at room temperature
/ it is not transparent / it is transparent
Note if three selected e.g. ‘not hard and
flexible and not a liquid’ = 1 mark
if all four selected, ‘not hard and flexible
and not a liquid and not transparent’ = 0
marks
Ignore other properties not in the table
e.g. it is insoluble
Page 14 of 20
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Checkpoint Primary – Mark Scheme
PUBLISHED
Question
13
Answer
October 2021
Marks
Further Information
sentence
2 all four correct = 2 marks
It is midday when the Sun is
highest in the sky.
three correct = 1 mark
one or two correct = 0 marks
The Sun goes down in the west.
true
In winter the Sun is lower in the
sky than in the summer.
false
In winter the Sun moves in the
opposite direction.
Page 15 of 20
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Checkpoint Primary – Mark Scheme
PUBLISHED
Question
14(a)
14(b)
Answer
Marks
Guidance
1 Accept result in table but the answer line
takes precedence
12
cold
October 2021
dark
light
no water
warmth
water
2 each correct circle = 1 mark
three circled and two correct = 1 mark
three circled and one correct = 0 marks
more than three circled = 0 marks
Page 16 of 20
0846/02
Checkpoint Primary – Mark Scheme
PUBLISHED
Question
15(a)
Answer
October 2021
Marks
Further Information
1 Accept tape measure / measuring tape /
meter stick / meter tape
rule(r)
Ignore measuring scale / scale / meter
Do not accept measuring cylinder
15(b)
any two from
2 each correct answer = 1 mark
Accept (same) size of stone / mass of
stone / weight of stone / material of stone /
kind of stone / type of stone
(same) stone
Accept ball or object or rock for stone
(same) sand
Accept (same) depth of sand / amount of
sand / type of sand / tray of sand / surface
of sand
(same) energy or force or power Blessy puts in to drop the stone
Accept force applied / strength
Ignore always use Blessy / just ‘same
force’
smooth the sand between drops / use smooth surface for the sand every
time
Ignore references to the method e.g.
drops stone into sand / change the height
Ignore always measure in mm / size of
tray / same surface
Do not accept height of drop / the (same)
crater
Page 17 of 20
0846/02
Checkpoint Primary – Mark Scheme
PUBLISHED
Question
Answer
October 2021
Marks
Further Information
2 each correct answer = 1 mark
16(a)
Accept do repeats / do it again / do
another test / try again / do more results /
do more experiments / double check
do more than one set of results
Ignore use a control / measure the
temperature twice
Accept use more temperatures between
those already used e.g. do a result for 15
°C
use more temperatures
Accept increase the temperature (beyond
50 °C) / decrease the temperature (below
0 °C) / do different temperatures / change
the range of temperature / use more than
six temperatures / do more to see if
pattern continues
Ignore change the temperature
Do not accept change the volume of
water
Page 18 of 20
0846/02
Checkpoint Primary – Mark Scheme
PUBLISHED
Question
16(b)
Answer
October 2021
Marks
(idea that) as temperature increases the mass (that dissolves) increases
Further Information
1 Accept it increases with 2 or 2.5 or 3
every temperature
Accept the higher the temperature the
most dissolved fertiliser / more heat the
fertiliser dissolved more
/ higher the temperature the more it
dissolves / as mass increases the
temperature increases / ‘they both
increase’
Ignore just ‘it increases’ / ‘it adds with 10
°C’
Ignore the higher the temperature the
faster it dissolves
16(c)
28 (g)
1 Accept answer written on graph, but the
answer line takes precedence
16(d)
any value in the inclusive range 34(g) to 49(g)
1
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Page 20 of 20
October 2021