Cambridge Lower Secondary Checkpoint
SCIENCE
1113/02
Paper 2
FINAL MARK SCHEME
October 2021
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 consists of 15 printed pages.
IB21 10_1113_02/5RP
© UCLES 2019
[Turn over
1113/02
Checkpoint Secondary – 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 15
1113/02
Checkpoint Secondary – Mark Scheme
PUBLISHED
Question
1(a)
Answer
part of plant
cell
Marks
tissue
leaf

palisade
mesophyll
root hair
1(b)
organ
October 2021
Further Information
2 all three parts correct = 2 marks
two parts correct = 1 mark
one part correct = 0 marks
two ticks in a row is incorrect except accept
palisade mesophyll as a cell and a tissue


part of animal
cell
sperm

tissue
organ
2 all three parts correct = 2 marks
two parts correct = 1 mark
one part correct = 0 marks
stomach

heart

Page 3 of 15
two ticks in a row is incorrect
1113/02
Checkpoint Secondary – Mark Scheme
PUBLISHED
Question
Answer
2(a)
October 2021
Marks
Further Information
1 both correct for the mark
B
Note two lines from or to any box = 0 marks
beryllium
Be
boron
2(b)
Br
1 Accept natrium
sodium
Ignore Na
2(c)
carbonate
hydroxide
oxide
sulfate
Page 4 of 15
1 more than one answer circled = 0 marks
1113/02
Checkpoint Secondary – Mark Scheme
PUBLISHED
Question
Answer
3(a)
radiation
Marks
October 2021
Further Information
1 both correct for the mark
The way the air above a
heater becomes warm.
Note two lines from or to any box = 0 marks
The way energy from the Sun
reaches the Earth.
convection
3(b)
The way the metal handle of
a cooking pot gets hot.
any three from
3 each correct answer = 1 mark
conduction
Accept copper is a conductor
particles vibrate
Accept particles move to and fro for vibrate or
particles gain kinetic energy
(as temperature increases) particles vibrate more / vibrate faster
Note particles vibrate faster / vibrate more = 2
marks
vibration passes from one particle to another / energy passes from one
particle to another
Accept heat passes from one particle to another
Accept higher level answer,
e.g. by electrons = 1 mark which move = 1 mark
Page 5 of 15
1113/02
Checkpoint Secondary – Mark Scheme
PUBLISHED
Question
Answer
October 2021
Marks
Further Information
4(a)(i)
concentration / strength (of weed killer)
1 Accept amount of weed killer or amount of
solution
4(a)(ii)
any two from
2 each correct answer = 1 mark
number of weeds or seedlings
species of weed or seedlings
Accept type of weed
age of weed or seedlings or size of weed or seedlings
volume of weed killer
Accept time
length of exposure to the weed killer
type of weed killer used
Accept temperature as an extra marking point
Accept humidity as an extra marking point
Accept light as an extra marking point
Accept type of cotton wool or amount of cotton
wool as an extra marking point
Page 6 of 15
1113/02
Checkpoint Secondary – Mark Scheme
PUBLISHED
Question
4(a)(iii)
Answer
October 2021
Marks
any two from
Further Information
2 each correct answer = 1 mark
number of weeds or seedlings used in each dish (at the start)
Accept size of weeds
number of weeds or seedlings killed or number of weeds or seedlings
surviving
concentration of weed killer
volume of weed killer
time or length of exposure (to weed killer)
4(b)
any one from
1
(weed killer) may be toxic
Accept weed killer may burn skin or may kill you
or may harm you or give an allergic reaction
(weed killer) may be corrosive
Ignore dangerous
(weed killer) may be an irritant
Ignore so weed killer does not affect skin
(weed killer) may be harmful
Ignore damage skin must specify the type of
damage
(weed killer) may be poisonous
Page 7 of 15
1113/02
Checkpoint Secondary – Mark Scheme
PUBLISHED
Question
Answer
Marks
Further Information
2 each correct answer = 1 mark
5(a)
5(b)
October 2021
on the poles
Accept south pole or north pole or on the ends
this is where the magnetic field is strongest
Note this mark is independent of the poles
X written between the poles or on the poles
1 Accept the centre of the cross within the shaded
region
Note if two crosses drawn both must be correct
5(c)
C
1
Page 8 of 15
1113/02
Checkpoint Secondary – Mark Scheme
PUBLISHED
Question
6(a)
Answer
Marks
Universal Indicator or pH meter
October 2021
Further Information
1 Accept pH paper or pH indicator
Do not accept use litmus
6(b)
wear eye protection or goggles
(because) liquids are corrosive or irritants or harmful
2 safety precaution = 1 mark
linked explanation = 1 mark
or
wear gloves or avoid getting liquids on your skin
(because) liquids are corrosive or toxic or irritants or harmful
or
wear a lab coat or protective clothing or avoid getting liquids on
clothes
(because) liquids are corrosive or toxic or irritants or harmful
Page 9 of 15
Accept burns instead of corrosive or give an
allergic reaction instead of irritation
Note unqualified damage to the skin is not
sufficient
1113/02
Checkpoint Secondary – Mark Scheme
PUBLISHED
Question
Answer
Marks
October 2021
Further Information
7(a)
selective breeding or artificial selection
1 Ignore cross breeding
7(b)
(male) C
1 both correct for the mark
and
(idea that) it is the variety with most wool
Question
8(a)
Answer
Marks
(particle X) electron
2 each correct answer = 1 mark
(particle Y) neutron
8(b)
8(c)(i)
8(c)(ii)
Copernicus Galileo
Accept both names reversed for 1 mark
Newton
Pasteur
1 more than one answer circled = 0 marks
Rutherford
1 Accept two / second / 2nd
Carbon is found in Period 2 of the Periodic Table.
Ar
Further Information
Al
B
Li
Si
Page 10 of 15
1 more than one answer circled = 0 marks
1113/02
Checkpoint Secondary – Mark Scheme
PUBLISHED
Question
Answer
October 2021
Marks
Further Information
9(a)
C
1
9(b)
B
1
9(c)
D
1
9(d)
C and D
1 both correct any order for the mark
Page 11 of 15
1113/02
Checkpoint Secondary – Mark Scheme
PUBLISHED
Question
Answer
Marks
Further Information
2 each correct answer = 1 mark
10(a)
10(b)
October 2021
exhaled air has less oxygen or air breathed out has less oxygen
Accept ora / 4% difference
exhaled air has more carbon dioxide or air breathed out has more
carbon dioxide
Accept ora / 3.96% difference
any two from
2 each correct answer = 1 mark
oxygen goes into the blood or oxygen leaves the air
Accept deoxygenated blood becomes oxygenated
or oxygen enters capillaries
carbon dioxide leaves the blood or carbon dioxide enters the air
Accept carbon dioxide leaves capillaries
(by) diffusion
(and) gaseous exchange
10(c)
1 both correct for the mark
any two from
Accept mouth, larynx or voice box, pharynx as
extra parts
trachea or windpipe
bronchus or bronchi
Ignore lungs / nostril / throat
bronchiole
Page 12 of 15
1113/02
Checkpoint Secondary – Mark Scheme
PUBLISHED
Question
11(a)
Answer
Marks
reacts rapidly with acid and slowly with water or more bubbles with acid
than water
October 2021
Further Information
1 Accept reacts vigorously with acid but not with
water
Note faster with acid is in the question so do not
credit if written
Note needs a comment about reaction with acid
and the reaction with water
11(b)
zinc or iron or lead or tin
1 Accept correct symbol but name takes
precedence, e.g. Zn / Fe / Pb / Sn
11(c)
(colourless gas) hydrogen
2 each correct answer = 1 mark
(alkaline solution) potassium hydroxide
Question
12
Answer
Marks
colour
of light
colour
of object
colour the object
appears
white
red
red
green
green
green
blue
red
black
Further Information
2 all three correct = 2 marks
one or two correct = 1 mark
Ignore pink for red
Accept light or dark preceding the colour
Accept no light or no colour for black
Page 13 of 15
1113/02
Checkpoint Secondary – Mark Scheme
PUBLISHED
Question
Answer
Marks
October 2021
Further Information
13(a)
dispersion or dispersal
1 Ignore refraction
13(b)
prism
1 Accept any type of prism
Page 14 of 15
1113/02
Checkpoint Secondary – Mark Scheme
PUBLISHED
Question
14
Answer
Marks
three ticks and two correct = 1 mark

three ticks and one correct = 0 marks
oil
more than three ticks = 0 marks
natural gas
solar
Further Information
2 each correct tick = 1 mark
coal
hydroelectric
October 2021

Page 15 of 15