Cambridge Primary Checkpoint
SCIENCE
0846/01
October 2021
Paper 1
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_01_MS/7RP
© UCLES 2021
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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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Question
1(a)
Answer
October 2021
Marks
Further Information
1 Accept polen
pollen
Ignore stamen / anther / filament / grain
Ignore pollination
Accept answer next to X on diagram, but
answer line takes precedence
1(b)
1(c)
anther
ovum
petal
stamen
stigma
1 more than one answer circled = 0 marks
1 Accept named insects / named butterflies /
named birds, e.g. bee / beetle / ant /
humming bird
insect / butterfly / bird
Ignore humans
Do not accept dog / sheep
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Question
Answer
October 2021
Marks
Further Information
3 each correct answer = 1 mark
2
A sound is made when an object vibrates.
Ignore bounces / moves / falls / is hit /
makes sound waves / shakes
The pitch describes how high or low a sound is.
Accept frequency
Ignore sound (level) meter
Sounds can also be loud or soft .
Do not accept decibels / volume
Accept quiet
Ignore not loud / silent
Do not accept high / low
Question
3
Answer
Marks
The compass needle moves when the needle is near iron and steel.
Further Information
1 both correct in either order for the mark
Accept iron and steel circled or indicated
on the list, but answer line takes
precedence
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Question
4
Answer
Marks
Further Information
1 more than one answer ticked = 0 marks
dull
high melting point
October 2021

soft
soluble in water
weak
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Question
Checkpoint Primary – Mark Scheme
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Answer
October 2021
Marks
Further Information
3 two lamps = 1 mark
5
cell symbol = 1 mark
closed switch = 1 mark
Do not accept
open switch for closed switch:
Do not accept
battery for cell:
symbols can be in any boxes but there
must be two lamps
Ignore gaps in the circuit / line across cell
symbol
Accept any orientation of symbol
Accept symbols without connecting wires
e.g.
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Question
October 2021
Answer
Marks
2
6(a)
(muscle A) gets longer / relaxes / relaxing
Further Information
each correct answer = 1 mark
Accept long
Ignore muscle A stretches / expands /
straightens / extends / gets loose / gets
bigger / flattens / reflex
(muscle B) gets shorter / contracts / contracting
Accept short
Ignore muscle B gets fatter / gets bigger /
tightens / smaller / shrinks / tenses
Ignore names of muscles e.g. biceps /
triceps
Do not accept contradictions on the same
line e.g. contracts and stretches for
muscle B
6(b)
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1 both needed in either order for the mark
heart (and) lungs
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Question
Answer
7(a)
7(b)
October 2021
Marks
letter
label
A
axis
B
Earth
C
orbit
D
Sun
the spin of the Earth / the rotation of the Earth / Earth turns on its axis
Further Information
2 all four correct = 2 marks
two or three correct = 1 mark
one correct = 0 marks
more than one line from a letter to
different labels = 0 marks for that letter
1 Accept World for Earth
Accept Earth revolves (on its axis)
Ignore just the axis of the Earth
Ignore movement or just spin or rotation
with no mention of Earth
Do not accept the Earth orbits (around
the Sun) / Earth revolves around the Sun
7(c)
1 Accept 365 days / 365 ¼ days / 365.25
days / 365,25 days
1 year
Accept 8760 hours / 525 600 minutes /
31 536 000 seconds
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Question
8(a)
Answer
October 2021
Marks
Further Information
1 more than one answer = 0 marks
ammonium chloride
Accept ammonium
Ignore white solid
8(b)
1 Accept boil (the water) / make it hotter /
use hot water
evaporate (the water) / heat (the solution)
Ignore cooling (after evaporation) /
change the temperature
Do not accept sodium chloride
evaporates
Do not accept other methods, e.g. freeze
/ filter
8(c)
1 Accept fizzing / temperature change /
colour change / makes a milky solution
(idea of) making a gas
Ignore there is a chemical reaction / forms
a new substance / reference to dissolving /
makes a solution / we cannot get it back
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Question
9(a)
Answer
October 2021
Marks
Further Information
1 Accept heat proof gloves / plastic glasses
/ goggles / safety glasses / safety coat
(idea of) eye protection / laboratory coat
Ignore gloves / tongs / heat proof mat /
test-tube rack / (sun)glasses / mask / coat
9(b)
A (and) D
1 both needed in either order for the mark
Accept colourless solid for A
Ignore white solid for D
9(c)
1 more than one answer = 0 marks
B
Ignore white solid
9(d)
1 Accept (colourless) liquid for E
E
and
because it makes steam / because it is a (colourless) liquid
9(e)
the mass (of test tube and contents) after she heats the material
Ignore because it becomes a gas /
because it evaporates / colourless
1 Accept mass at the end / mass when it
has been heated / mass of black solid
Accept weight or ‘it’ for mass
Do not accept volume
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Question
10(a)
Answer
10(c)
10(d)
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Marks
Further Information
1
5 (N)
10(b)
October 2021
number of masses
force in N
(2)
(2)
3
3
5
5
7
7
10
10
1 all four correct = 1 mark
Accept results in any order in the table as
long as they are matched correctly
Ignore units in the body of the table
As the number of masses increases the reading on the forcemeter
increases.
1 Accept goes up / is more / gets bigger
8 (N)
1
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Accept is the same as the number of
masses
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Question
11(a)
Answer
October 2021
Marks
Further Information
1 Accept any suitable variable that needs to
be kept constant
any one from
Ignore just ‘water’
amount of water
time (to grow)
amount of light / same window / same place
type of plant / number of plants / number of leaves / size of plant (at start)
temperature
size of the bottles / material of the bottle
Ignore same plant / any reference to
seeds
Accept shape of bottles / height of bottles
Ignore same bottle / same amount of
bottles
Do not accept colour of bottle
Ignore amount of soil
type of soil
2 first sentence correct = 1 mark
11(b)
The plants grow best in the clear bottle.
second and third sentences correct
= 1 mark
This is because the plant in this bottle is biggest .
Accept big or bigger for biggest
The conclusion will be more reliable if they put more plants in each bottle.
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Question
Answer
11(c)
colour
October 2021
Marks
Further Information
1 more than one answer circled = 0 marks
energy
food
temperature
water
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Question
12(a)
Answer
October 2021
Marks
Further Information
1 Accept pumped by heart / carried in the
red blood cells / heart sends blood /
through the blood vessels / through or in
any named blood vessel e.g. in veins
(carried) in the blood
Ignore by the lungs / pumped by the lungs
Do not accept incorrect organs, e.g. the
kidneys put oxygen into the blood
12(b)
any two from
2 each correct answer = 1 mark
to stay alive
Accept to survive / not to die
to give energy
Accept for respiration / to make energy
Accept to exercise
so he can move
so he can grow
Accept so cells can work / so body can
work / for organs to function
so organs can work
Accept correct examples of named
functions e.g. circulate blood / breathing /
keep brain thinking / keep heart pumping /
excrete / expel carbon dioxide
Ignore to be healthy / for asthma /
breathing problems
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Question
13(a)
Answer
October 2021
Marks
Further Information
1 Accept light is obstructed
card or star or it is opaque / light is blocked
Ignore the card is not transparent / the
card is solid / card covers the light / white
screen is opaque
Do not accept light is reflected
13(b)
any one from
1
increases / gets bigger
Ignore disappears
less sharp / paler
13(c)
light is reflected (off the mirror)
1 if direction of reflection is given then
the direction must be correct
Accept the light hits the mirror and it
reflects (the card) / light is reflected by the
mirror / light is reflected on(to) the mirror /
light is reflected into the mirror / light is
reflected into her eyes / light reflects from
star to mirror
Ignore mirror reflects the star / mirror
reflects the card / (just) light is reflected
from star
Do not accept incorrect statements e.g.
light is reflected off the mirror onto the star
/ light is reflecting to the star and star
reflects the mirror
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Question
14(a)
Answer
October 2021
Marks
Further Information
1 Accept the point at which a liquids
temperature can no longer increase
(temperature at which) liquid becomes a gas/vapour
Ignore the temperature at which the liquid
evaporates / liquid become steam / liquid
starts to boil
Do not accept solid becomes a gas
14(b)
1 unit needed for mark
100 °C
Accept answers with C and °
e.g. °c / C° / c° / degrees C / degrees
Celsius
Ignore just C / just ° / degrees
Accept 212 °F
14(c)
1 Ignore ice becomes liquid / solid becomes
water / solid starts to melt
(temperature at which) solid becomes a liquid
Do not accept solid becomes a gas /
when a solid dissolves
14(d)
1 unit needed for mark
0 °C
Accept answers with C and °
e.g. °c / C° /
Ignore just C / just ° / degrees
Accept 32 °F
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Question
15(a)
Answer
October 2021
Marks
a plant that uses or gets energy from the Sun / a plant that makes (its own)
food
Further Information
1 Accept living thing or organism or
producer or it for plant
Accept a plant that produces food
Ignore a plant that starts a food chain /
(just) a (green) plant / eaten by consumers
/ a plant that makes or produces nutrients
Do not accept a plant that produces or
makes energy
15(b)
an animal that eats or feeds
1 Accept living thing or organism or
consumer or it for animal
Accept an animal that only eats plants /
an animal that only eats animals / an
animal that consumes or gets food / an
animal that gets energy from living things /
an animal that consumes the producer’s
energy
Ignore (just) an animal that consumes / an
animal that can’t produce its food
15(c)
an animal that hunts or catches another animal / prey
1 Accept an animal that chases or attacks
(and eats) another animal / animal that
hunts or catches food / an animal that kills
its prey
Ignore an animal eats another animal or
prey / is a carnivore
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Question
15(d)
Checkpoint Primary – Mark Scheme
PUBLISHED
Answer
October 2021
Marks
Further Information
1 more than one answer circled = 0 marks
always doubles
always halves
decreases
increases
stays the same
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Question
16(a)
Answer
October 2021
Marks
Further Information
1 if ‘no’ is ticked = 0 marks
yes (no marks)
Accept it will lose less heat / less space
for heat to escape / idea they insulate
each other / less or no air can reach the
tube to make it cold
(idea) that other tubes will share the heat
Ignore huddle together to keep warm /
helps them stay warm / it is covered or
closed by other tubes / they are in a group
/ there are more tubes / they have more
water / they make heat
1 both correct in either order = 1 mark
16(b)
wraps fur around a boiling tube
Accept alternatives to fur, e.g. material /
cloth / paper / tissue / blanket / hair /
plastic
puts the boiling tube in beaker A
puts another boiling tube into beaker B with no fur around it
Accept nothing for no fur
Accept a comparison showing differences
between the amount of fur e.g. 10 fur and
1 fur / fur and less fur
Ignore comparisons between different
materials e.g. towel and fur
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BLANK PAGE
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