Science
Stage 7
2024
Paper 1
45 minutes
No additional materials are needed.
INSTRUCTIONS
• Answer all questions.
• Write your answer to each question in the space provided.
• You should show all your working on the question paper.
INFORMATION
• The total mark for this paper is 50.
• The number of marks for each question or part question is shown in brackets [ ].
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2
1
This question is about animal and plant cells.
(a) Look at the diagram of an animal cell.
Complete the labels on the diagram.
Choose from the list.
cell wall
cytoplasm
chloroplast
mitochondrion
cell membrane
nucleus
sap vacuole
.......................................
.......................................
.......................................
.......................................
[2]
(b) Name two cell structures that are only found in plant cells.
1
2
[2]
(c) What is the function of mitochondria in cells?
[1]
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3
2
Look at the particle models of some substances.
The circles
,
and
represent different types of atoms.
A
B
C
D
E
F
(a) Which particle model represents a solid element?
[1]
(b) Which particle models represent pure compounds?
and
Explain your answer.
[2]
(c) Which particle model represents a mixture of elements?
[1]
(d) Which particle model represents a mixture of compounds?
[1]
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4
(e) Mercury is a liquid at room temperature.
The circle
represents an atom of mercury.
Draw in the box the particle model of mercury at room temperature.
[1]
(f) Steel is an alloy.
Explain the meaning of the word alloy.
[2]
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5
3
During an activity there are changes in energy.
Oliver climbs up the steps, walks along the platform and jumps into the water.
platform
steps
splash in the water
(a) Complete the sentences to describe the changes in energy.
Choose from the list.
chemical
electrical
sound
thermal
When Oliver makes a splash in the water, some of his energy is converted
into
energy and some into
energy.
[2]
(b) Energy dissipates during an activity.
What does this mean?
[1]
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6
4
Look at the diagram of a model of a tectonic plate boundary.
tectonic plate
magma
(a) Describe three events that occur near this type of tectonic plate boundary.
1
2
3
[3]
(b) Complete the sentences about the model of plate tectonics.
Choose from the list.
atmosphere
magma
core
mantle
crust
water
The solid outer layer of the Earth consists of the
and the upper part of the
.
The solid outer layer of the Earth has tectonic plates that move.
The tectonic plates move because of
flow in the mantle.
[2]
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7
5
Look at the diagrams of two specialised cells.
cell A
root hair cell
NOT TO SCALE
(a) What is the name of cell A?
[1]
(b) Explain how the structure of the root hair cell is adapted to its function.
[2]
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8
6
Blessy wants to identify some gases.
Draw a straight line to match each gas to the correct test for the gas.
gas
test for the gas
carbon dioxide
relights a glowing splint
hydrogen
turns limewater milky
oxygen
burns with a squeaky pop when
ignited with a burning splint
[2]
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9
7
Yuri draws a diagram to show how he hears the sound made by a loudspeaker.
loudspeaker
Yuri
The dots in the diagram represent air particles.
(a) Describe what happens to air particles when the loudspeaker makes a sound.
[2]
(b) Explain why sound does not travel through a vacuum.
[1]
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10
8
The diagram shows part of the water cycle.
condensation
water vapour
precipitation
evaporation
A
groundwater
(a) Identify and describe process A.
process A
description
[2]
(b) Draw a straight line to match each process to its correct description.
process
description
precipitation
the process of water vapour changing
into liquid water
condensation
the process of liquid water changing
into water vapour
evaporation
the process by which water
falls from clouds
[2]
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11
9
Class 7 investigate growth in plants.
(a) The class use secondary information sources.
What is a secondary information source?
[1]
(b) Class 7 investigate the growth of five different plant species.
In their first experiment the teacher:
• fills a plant pot with soil
• puts 5 seeds of a plant species into the soil
• waters the soil
• leaves the seeds for 10 days to grow into seedlings.
The teacher repeats the experiment four more times using different plant species.
Mia and Jamila each choose different ways to measure the growth of the seedlings.
Mia finds the mass of each plant pot and soil before and after the 10 days.
Jamila measures the height of the seedlings after 10 days and calculates the average height.
(i) Explain why Mia’s method of measuring the growth does not give accurate results.
[1]
(ii) Explain why Jamila’s results are reliable.
[1]
(iii) Describe and explain one safety precaution the teacher takes in this investigation.
safety precaution
explanation
[2]
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12
10 Mike investigates three substances, milk, vinegar and bleach.
He wants to know the pH of each of the three liquids.
Write down how Mike does this investigation.
Include:
• the names of any chemicals he uses
• the method
• how Mike is able to make a conclusion from his results.
[3]
Solution for this paper available at
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13
11 Lily investigates how the number of lamps in an electrical circuit affects the current.
She uses this electrical circuit.
1.20
battery of cells
meter
lamp
(a) The battery of cells has hazard symbols.
hazard symbol A
hazard symbol B
Write down the meaning of each of these hazard symbols.
hazard symbol A
hazard symbol B
[2]
(b) The meter is used to measure current.
Write down the name of the meter used to measure current.
[1]
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14
(c) Lily increases the number of lamps in the electrical circuit and records the current.
She repeats the experiment three times and calculates the average current.
Here are her results.
number
of lamps
current current current
in A
in A
in A
average current
in A
1
1.22
1.20
1.18
1.20
2
0.60
0.61
0.59
0.60
3
0.42
0.38
1.30
0.40
4
0.30
0.30
0.30
0.30
5
0.25
0.27
0.20
(i) Write down the anomalous current reading.
current
A
[1]
A
[1]
(ii) Calculate the average current for 5 lamps.
average current
(iii) Complete the sentence.
As the number of lamps is doubled the current
.
[1]
Solution for this paper available at
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15
12 Complete the sentence about tidal forces on Earth.
Tidal forces on Earth are due to the
the Earth,
force of attraction between
and
.
[2]
13 Describe the difference between electrical conductors and electrical insulators.
Use the idea of electrons in your answer.
[1]
Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every
reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the
publisher will be pleased to make amends at the earliest possible opportunity.
To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge Assessment
International Education Copyright Acknowledgements Booklet. This is produced annually and is available to download at
https://lowersecondary.cambridgeinternational.org/
Cambridge Assessment International Education is part of Cambridge Assessment. Cambridge Assessment is the brand name of the University of Cambridge
Solution
this paper
available at
Local Examinations Syndicate (UCLES), which is a department
of thefor
University
of Cambridge.
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© UCLES 2024
21
38
Sr
strontium
88
56
Ba
barium
137
88
37
Rb
rubidium
85
55
Cs
caesium
133
87
actinoids
lanthanoids
–
40
39
–
actinoids
calcium
potassium
Ra
Ca
K
radium
89–103
20
19
Fr
57–71
24
23
francium
89
magnesium
sodium
22
name
cerium
140
90
Th
thorium
232
lanthanum
139
89
Ac
actinium
–
231
protactinium
Pa
91
141
praseodymium
Pr
59
58
Ce
57
–
–
dubnium
Db
105
181
tantalum
Ta
73
93
niobium
Nb
41
51
vanadium
V
23
Cr
24
238
uranium
U
92
144
neodymium
Nd
60
–
seaborgium
Sg
106
184
tungsten
W
74
96
molybdenum
Mo
42
52
chromium
relative atomic mass
rutherfordium
Rf
104
178
hafnium
Hf
72
91
zirconium
Zr
40
48
titanium
Ti
La
lanthanoids
yttrium
Y
39
45
scandium
Sc
Mg
12
11
Na
9
7
atomic symbol
Be
beryllium
Li
lithium
atomic number
4
3
Key
2
1
–
neptunium
Np
93
–
promethium
Pm
61
–
bohrium
Bh
107
186
rhenium
Re
75
–
technetium
Tc
43
55
manganese
Mn
25
–
plutonium
Pu
94
150
samarium
Sm
62
–
hassium
Hs
108
190
osmium
Os
76
101
ruthenium
Ru
44
56
iron
Fe
26
27
28
29
30
–
americium
Am
95
152
europium
Eu
63
–
meitnerium
Mt
109
192
–
curium
Cm
96
157
gadolinium
Gd
64
–
darmstadtium
Ds
110
195
platinum
Pt
Ir
iridium
78
106
palladium
Pd
46
59
nickel
Ni
77
103
rhodium
Rh
45
59
cobalt
Co
–
berkelium
Bk
97
159
terbium
Tb
65
–
roentgenium
Rg
111
197
gold
Au
79
108
silver
Ag
47
64
copper
Cu
–
californium
Cf
98
163
dysprosium
Dy
66
–
copernicium
Cn
112
201
mercury
Hg
80
112
cadmium
Cd
48
65
zinc
Zn
B
C
–
einsteinium
Es
99
165
holmium
Ho
67
–
nihonium
Nh
113
204
thallium
Tl
81
115
–
fermium
Fm
100
167
erbium
Er
68
–
flerovium
Fl
114
207
lead
Pb
82
119
tin
Sn
In
indium
50
73
germanium
Ge
32
28
silicon
49
70
gallium
Ga
31
27
aluminium
Si
14
13
Al
12
carbon
11
boron
6
–
mendelevium
Md
101
169
thulium
Tm
69
–
moscovium
Mc
115
209
bismuth
Bi
83
122
antimony
Sb
51
75
arsenic
As
33
31
phosphorus
P
15
14
nitrogen
N
7
–
nobelium
No
102
173
ytterbium
Yb
70
–
livermorium
Lv
116
–
polonium
Po
84
128
tellurium
Te
52
79
selenium
Se
34
32
sulfur
S
16
16
oxygen
O
8
–
lawrencium
Lr
103
175
lutetium
Lu
71
–
tennessine
Ts
117
–
astatine
At
85
127
iodine
I
53
80
bromine
Br
35
35.5
chlorine
Cl
17
19
fluorine
F
9
–
oganesson
Og
118
–
radon
Rn
86
131
xenon
Xe
54
84
krypton
Kr
36
40
argon
Ar
18
20
neon
Ne
10
4
5
helium
8
1
7
hydrogen
6
2
5
He
4
H
3
1
Group
The Periodic Table of Elements
16
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