Cambridge International Examinations
Cambridge Secondary 1 Checkpoint
1113/02
SCIENCE
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.
This document consists of 11 printed pages.
IB18 10_1113_02/3RP
© UCLES 2018
[Turn over
©UCLES 2018
1
Question
1113/02
transports water and
minerals
absorbs water and
minerals from soil
function
Answer
Page 2 of 11
plant cell
Marks
2
Checkpoint Secondary 1 Science – Mark Scheme
PUBLISHED
two lines from a function = 0 marks
each correct line = 1 mark
Further Information
October 2018
©UCLES 2018
3
Question
2(b)
2(a)
chloride
oxide
sulfide
chlorine
oxygen
sulfur
A4 is 0.8 A.
A3 is 0.4 A.
A2 is 0.4 A.
water
type of
compound
nonmetal
Answer
Page 3 of 11
Marks
2
1
2
Answer
Question
Marks
Checkpoint Secondary 1 Science – Mark Scheme
PUBLISHED
1113/02
one correct = 0 marks
two correct = 1 mark
three correct = 2 marks
Further Information
Further Information
October 2018
©UCLES 2018
5(b)
5(a)
Question
4
Question
1113/02
same or similar to the one in January
stars not in the same position
Page 4 of 11
1
Accept stars have moved / position of stars /
constellations have moved / arrangement of stars is
different
different brightness of stars
1
Further Information
Accept permeable skin / idea of absorbing oxygen
through the skin / lays eggs in water / lays unshelled
eggs
Accept reference to young being tadpoles sufficient
for larval stage
2 Note second marking point is dependent on correct
identification of amphibian(n)
Further Information
Accept the biggest star has moved
Marks
Marks
October 2018
different size stars
any one from
Answer
valid reason e.g. larval stage / smooth skin / moist skin
frog = amphibia(n)
Answer
Checkpoint Secondary 1 Science – Mark Scheme
PUBLISHED
Page 5 of 11
Marks
©UCLES 2018
more particles
7(c)
more collisions
1
any volume greater than 22 (cm3)
7(b)
2
1
40 (cm3)
Answer
7(a)
Question
October 2018
Accept less space between particles / more
particles in one unit volume / more crowded particles
/ more particles in the same space / particles closer
together / more particles (to) collide / particles more
concentrated / more frequent collisions / collisions
more often / more chance of collisions = 2 marks
Further Information
Accept same size
3 Accept grew very well / tall(er)
gas C = (idea of) no change / not grown
gas A = grown / increased in size
6(b)
1
Accept wilting
oxygen
6(a)(ii)
1
Further Information
gas B = small(er) / dying
photosynthesis
6(a)(i)
Answer
Question
Marks
Checkpoint Secondary 1 Science – Mark Scheme
PUBLISHED
1113/02
©UCLES 2018
8
loud speaker
letter R touching area where dots are far apart
Page 6 of 11
letter C touching area where dots are close together
air particles
2
Answer
Question
Marks
Checkpoint Secondary 1 Science – Mark Scheme
PUBLISHED
1113/02
Further Information
October 2018
carbon dioxide
any two from
9(c)
9(d)
©UCLES 2018
oxygen
9(b)
Page 7 of 11
so gaseous exchange is less efficient / diffusion (of oxygen) is
slower
lower concentration gradient (for gaseous exchange)
so less oxygen (taken in with each breath idea)
air is less dense / few(er) particles / particles further apart
(aerobic) respiration
9(a)
2
1
1
1
Answer
Question
Marks
Checkpoint Secondary 1 Science – Mark Scheme
PUBLISHED
1113/02
Do not accept breathing
Accept anaerobic respiration
Further Information
October 2018
©UCLES 2018
11(b)
11(a)
Question
10(c)
magnesium + hydrochloric (acid)
10(b)
dispersion
(violet)
indigo
(blue)
green
(yellow)
orange
(red)
Answer
Page 8 of 11
stop chemicals getting into eye / avoid injuries to eye from
corrosive chemicals / stop reaction (mixture) getting into the
eyes
magnesium chloride + hydrogen
calcium
magnesium
zinc
iron
10(a)
Marks
all correct = 1 mark
Further Information
October 2018
note these are the only colours allowed
one or two correct and in correct order = 1 mark
2 three correct and in correct order = 2 marks
Further Information
There must be a reference to the eye and a
substance, chemical or reaction
1 Ignore refraction
1
magnesium chloride as a product = 1 mark
hydrogen as a product = 1 mark
3 both reactants in any order = 1 mark
1
Answer
Question
Marks
Checkpoint Secondary 1 Science – Mark Scheme
PUBLISHED
1113/02
©UCLES 2018
12(c)
12(b)
12(a)
copper
water
nitric (acid)
Elements in mixtures are joined by
chemical bonds.
Mixtures only contain elements.
Mixtures can be separated by physical
means.
Mixtures are pure substances.
(carbon)
magnesium carbonate

sulfur
element
compound
Page 9 of 11
1
1
2
Answer
Question
Marks
Checkpoint Secondary 1 Science – Mark Scheme
PUBLISHED
1113/02
more than one tick  = 0 marks
note if substance is written in both columns then
that substance is incorrect
one correct = 0
two or three correct = 1 mark
all correct = 2 marks
Further Information
October 2018

low
©UCLES 2018
Page 10 of 11
(blood is at high) pressure / so it does not rupture
high
14(b)(ii)
low
concentration
of oxygen
artery

high
concentration
of carbon dioxide
Answer
This makes the liquid become cooler.
This is called evaporation.
1
1
1
October 2018
Accept so blood vessel will not burst / resists the
pressure of the blood
any incorrect tick = 0 marks
both ticks required
Further Information
Accept denser / decrease in volume / gas / (water)
vapour
Ignore freely
Accept vigorous
These molecules move fast / quick / rapid enough to escape
the surface of the liquid.
4 each correct answer = 1 mark
Further Information
Accept heat energy / speed
Marks
Marks
Some of the molecules have more energy.
All the water molecules in the liquid are moving.
Answer
Checkpoint Secondary 1 Science – Mark Scheme
PUBLISHED
14(b)(i)
14(a)
Question
13
Question
1113/02
D
E
©UCLES 2018
16
Question
Answer
Answer
F1 x d1 = F2 x d2
but for 2 marks
Page 11 of 11
balance when moments are equal / balance when clockwise
moment equals anti-clockwise moment
force x distance is a moment
increasing / going up
C
15(b)
B
A
15(a)
Question
Marks
Marks
2
1
1
answer must refer to moments rather than force or
pressure
Accept F1 x d1 or F2 x d2
Further Information
Accept accelerating / (goes) faster / slow then goes
fast
more than one answer = 0 marks
Further Information