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IB18 10_0846_02/3RP © UCLES 2018 [Turn over
Cambridge International Examinations Cambridge Primary Checkpoint
SCIENCE 0846/02
Paper 2 October 2018
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 an 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.
0846
/02
Che
ckpo
int P
rimar
y 2
Sci
ence
– M
ark
Sch
eme
Oct
ober
201
8
PU
BL
ISH
ED
©
UC
LES
201
8
Pag
e 2
of 1
2 Q
ues
tio
n
An
swer
M
arks
Fu
rth
er In
form
atio
n
1(a)
ki
logr
ams(
s)/g
ram
(s)
1 A
ccep
t k
g / g
1(b)
spring
mass
1 A
ccep
t an
y do
wnw
ards
poi
ntin
g ar
row
(s)
on th
e di
agra
m o
r in
the
answ
er s
pace
an
y in
corr
ect a
rrow
s =
0 m
arks
Qu
esti
on
A
nsw
er
Mar
ksF
urt
her
Info
rmat
ion
2(a)
Sug
ar d
isso
lves
in w
ater
bec
ause
wat
er is
a s
olv
ent.
Cha
lk d
oes
not
diss
olve
bec
ause
it is
inso
lubl
e.
2 ea
ch c
orre
ct a
nsw
er =
1 m
ark
2(b)
bl
ue
1 Ig
no
re li
ght /
dar
k
2(c)
sa
lt 1
Ign
ore
cry
stal
s
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LES
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Pag
e 3
of 1
2 Q
ues
tio
n
An
swer
Mar
ksF
urt
her
Info
rmat
ion
3(a)
th
e co
lour
of t
he li
tter
the
mas
s o
f th
e lit
ter
th
e sh
ape
of th
e lit
ter
th
e ty
pe o
f lit
ter
wh
ere
she
fou
nd th
e lit
ter
1 m
ore
than
one
ans
wer
circ
led
= 0
mar
ks
3(b)
(id
ea o
f) le
ss li
tter
/ th
e bi
ns c
onta
in li
tter
/ st
uden
ts a
re th
row
ing
litte
r in
to t
he b
ins
1 A
ccep
t ot
her
wor
ds fo
r lit
ter
e.g.
gar
bage
/ tr
ash
3(c)
T
he t
otal
for
pap
ers
is 2
4.
The
tot
al f
or p
last
ic b
ottle
s is
17
.
The
low
est n
umbe
r is
for st
raw
s.
1 al
l thr
ee c
orre
ct fo
r 1
mar
k A
ccep
t 12
for
stra
ws
3(d)
(id
ea th
at)
they
are
diff
eren
t siz
es
1 A
ccep
t di
ffere
nt m
asse
s or
wei
ghts
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201
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UC
LES
201
8
Pag
e 4
of 1
2 Q
ues
tio
n
An
swer
M
arks
F
urt
her
Info
rmat
ion
4
mat
eria
l
pro
per
ty
whi
te s
olid
carb
on
diox
ide
flam
mab
le li
quid
gaso
line
m
eltin
g po
int o
f 0
C
mer
cury
colo
urle
ss g
as
stee
l
silv
er li
quid
wat
er
at
trac
ted
to a
m
agne
t
pin
k so
lid
5 ea
ch c
orre
ct m
atch
= 1
mar
k tw
o or
mor
e lin
es fr
om a
mat
eria
l = 0
for
this
m
ater
ial
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©
UC
LES
201
8
Pag
e 5
of 1
2 Q
ues
tio
n
An
swer
M
arks
F
urt
her
Info
rmat
ion
5(a)
(s
un
) ro
se
aph
id
bee
tle
bird
2
all t
hre
e ar
row
s in
cor
rect
dire
ctio
n =
1 m
ark
arro
ws
mus
t hav
e ar
row
hea
ds p
oint
ing
in th
e co
rrec
t dire
ctio
n (f
rom
ros
e to
bird
) al
l org
anis
ms
in c
orre
ct o
rder
= 1
mar
k
5(b)
B
eetl
e 1
mor
e th
an o
ne o
rgan
ism
e.g
. bee
tle a
nd a
phid
= 0
m
arks
Q
ues
tio
n
An
swer
M
arks
F
urt
her
Info
rmat
ion
6(a)
0
1
2
3
4
1
mor
e th
an o
ne c
ircle
d =
0 m
arks
6(b)
or
1 on
e lin
e m
ust b
e lo
nger
than
the
othe
r bu
t the
y ca
n
be th
e an
y th
ickn
ess
6(c)
(P
redi
ct w
hat
will
hap
pen
if th
e ob
ject
is a
go
od
con
duct
or)
lam
p w
ill b
e b
rig
ht
/ lam
p w
ill li
gh
t u
p /
lam
p w
ill
glo
w.
(Pre
dict
wha
t w
ill h
appe
n if
the
obje
ct is
a b
ad c
ondu
ctor
) la
mp
w
ill b
e d
im /
lam
p w
ill n
ot
ligh
t u
p /
lam
p w
ill n
ot
glo
w.
1 b
oth
cor
rect
= 1
mar
k A
ccep
t lig
ht o
r bu
lb fo
r la
mp
A
ccep
t th
e la
mp
turn
s on
A
ccep
t la
mp
or b
ulb
will
not
wor
k /
the
lam
p do
es
not t
urn
on
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LES
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Pag
e 6
of 1
2 6(
d)
�
1 m
ore
than
one
box
tick
ed =
0 m
arks
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201
8
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BL
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©
UC
LES
201
8
Pag
e 7
of 1
2 Q
ues
tio
n
An
swer
M
arks
F
urt
her
Info
rmat
ion
7(a)
d
ay
nig
ht
W
Z
X
Y
1 al
l cor
rect
= 1
mar
k
7(b)
1
part
of t
he E
arth
mus
t be
with
in th
e gu
idel
ines
and
on
th
e or
bit (
dott
ed li
ne)
Qu
esti
on
A
nsw
er
Mar
ksF
urt
her
Info
rmat
ion
8(a)
ther
mom
ete
r 1
Acc
ept
tem
pera
ture
pro
be
8(b)
incr
ease
s (id
ea o
f the
n) s
tays
con
stan
t / s
tays
the
sam
e
2 ea
ch c
orre
ct a
nsw
er =
1 m
ark
Acc
ept
gets
hot
ter
/ bec
omes
hot
/ he
ats
up
Q
ues
tio
n
An
swer
M
arks
F
urt
her
Info
rmat
ion
9 re
prod
uctio
n 1
mor
e th
an o
ne p
roce
ss =
0 m
arks
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BL
ISH
ED
©
UC
LES
201
8
Pag
e 8
of 1
2 Q
ues
tio
n
An
swer
M
arks
F
urt
her
Info
rmat
ion
10(a
)
D
B
A
C
2 fo
ur
in c
orre
ct b
oxes
= 2
mar
ks
two
or
thre
e in
cor
rect
box
es =
1 m
ark
on
e in
cor
rect
box
= 0
mar
ks
10(b
)
All
of th
e m
ater
ials
allo
w li
ght
to p
ass
thro
ugh
.
Non
e of
the
mat
eria
ls a
llow
ligh
t to
pass
thro
ugh.
One
mat
eria
l is
opaq
ue.
Thr
ee m
ater
ials
let m
ost l
ight
thro
ugh.
Tw
o m
ater
ials
are
op
aque
.
Tw
o m
ater
ials
let m
ost l
ight
thro
ugh.
2 ea
ch c
orre
ct a
nsw
er =
1 m
ark
two
tick
s =
2 m
arks
o
ne
tick
= 1
mar
k th
ree
ticks
2 c
orre
ct =
1 m
ark
thre
e tic
ks 1
cor
rect
= 0
mar
ks
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BL
ISH
ED
©
UC
LES
201
8
Pag
e 9
of 1
2 Q
ues
tio
n
An
swer
M
arks
F
urt
her
Info
rmat
ion
11(a
)
polle
n is
col
lect
ed fr
om th
e m
ale
orga
n / i
s co
llect
ed fr
om th
e st
ame
n / i
s co
llect
ed f
rom
the
ant
her
2 on
ly a
war
d po
llen
mar
k if
the
cont
ext i
s co
rrec
t e.g
.
polle
n is
mad
e / p
olle
n is
col
lect
ed /
polle
n is
take
n A
ccep
t ex
am
ples
whe
n an
inse
ct is
invo
lved
in
mov
ing
the
polle
n e.
g. p
olle
n is
col
lect
ed b
y th
e
inse
ct =
2 m
arks
11(b
)
po
llina
tion
/ tra
nsfe
r of
pol
len
(to
fem
ale
part
or
flow
er)
1 A
ccep
t po
llen
falls
(of
f th
e in
sect
or
onto
the
stig
ma)
/ p
olle
n is
col
lect
ed b
y th
e st
igm
a
Qu
esti
on
A
nsw
er
Mar
ks
Fu
rth
er In
form
atio
n
12(a
)
The
wat
er in
the
beak
er v
ibra
tes
/ mo
ves
/ ris
es /
incr
ease
s / s
pla
shes
/ b
ub
ble
s / s
hak
es.
Thi
s is
bec
ause
the
tun
ing
fo
rk is
vib
rati
ng
/ sh
akin
g
/ mo
vin
g.
2 ea
ch c
orre
ct a
nsw
er =
1 m
ark
Acc
ept
othe
r w
ords
that
mea
ns th
ere
is m
ovem
ent
12(b
)
vibr
ate
the
tuni
ng fo
rk h
arde
r 1
Acc
ept
hit
the
tuni
ng f
ork
hard
er /
hit
the
tuni
ng fo
rk
mor
e (t
han
once
) / a
dd a
noth
er tu
ning
fork
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©
UC
LES
201
8
Pag
e 10
of 1
2 Q
ues
tio
n
An
swer
M
arks
F
urt
her
Info
rmat
ion
13(a
)
C a
nd
D
1
13(b
)
E
1
13(c
)
C
1
13(d
)
A
1
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UC
LES
201
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Pag
e 11
of 1
2 Q
ues
tio
n
An
swer
Mar
ksF
urt
her
Info
rmat
ion
14
light
/su
nlig
ht /
Sun
is
ref
lect
ed (
by th
e w
ater
)
2 lig
ht =
1 m
ark
re
flect
ed =
1 m
ark
Qu
esti
on
An
swer
M
arks
F
urt
her
Info
rmat
ion
15(a
)
m
easu
ring
beak
er
mea
suri
ng
cyl
ind
er
m
easu
ring
jug
m
easu
ring
scal
es
m
easu
ring
spoo
n
1 m
ore
than
one
ans
wer
circ
led
= 0
mar
ks
15(b
)
6
(cm
) 10
(cm
) 4
(cm
) in
crea
ses
/ goe
s up
/ is
mor
e /
talle
r /
grow
s
2 fo
ur
corr
ect =
2 m
arks
tw
o o
r th
ree
corr
ect =
1 m
ark
on
e co
rrec
t = 0
mar
ks
Acc
ept
erro
r ca
rrie
d fo
rwar
d fr
om p
revi
ous
two
num
bers
i.e.
the
diff
eren
ce b
etw
een
thes
e nu
mbe
rs
15(c
)
repe
at /
do th
e in
vest
igat
ion
with
mor
e se
eds
1 A
ccep
t fin
d th
e av
erag
e / u
se m
ore
than
one
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LES
201
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Pag
e 12
of 1
2 Q
ues
tio
n
An
swer
M
arks
F
urt
her
Info
rmat
ion
16
any
two
fro
m
are
atta
ched
to b
ones
/ to
pul
l bon
es /
to m
ove
the
bone
s w
ork
in p
airs
/ A
and
B w
ork
toge
ther
/ w
ork
toge
ther
co
ntra
ct /
con
trac
ting
rela
x / r
elax
ing
2 ea
ch c
orre
ct s
tate
men
t = 1
mar
k A
ccep
t by
the
bon
es m
ovin
g A
ccep
t an
tago
nist
ic