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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

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Pag

e 2

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tio

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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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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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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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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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of 1

2 6(

d)

�

1 m

ore

than

one

box

tick

ed =

0 m

arks

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201

8

Pag

e 7

of 1

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ues

tio

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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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201

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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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Pag

e 9

of 1

2 Q

ues

tio

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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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An

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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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Pag

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of 1

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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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of 1

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An

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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