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Science Stage 7 P2 QP 2022
Plant Taxonomy (Tanta University)
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Science
Stage 7
2022
Paper 2
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 [ ].
3144_02_9RP
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1
Look at the diagrams of different cells.
A
B
C
D
E
F
NOT TO SCALE
(a) Four of the cells are animal cells.
Write down the letters of the four animal cells.
[1]
(b) Write down two reasons why these cells are animal cells and not plant cells.
1
2
[2]
(c) Microorganisms are made of cells.
How many cells does a typical microorganism contain?
[1]
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2
Steel is an alloy.
It contains carbon and iron.
(a) Complete the sentence by ticking () the correct box.
Steel is
.
an atom
an element
a compound
a mixture
[1]
(b) Look at the particle models for steel and iron.
carbon atom
iron atom
steel
iron
Explain, using the particle model, why steel is harder than iron.
[2]
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3
Pierre and Priya investigate air resistance.
They have a ball and a feather.
ball
feather
Pierre drops the ball and the feather from the same height.
Priya times how long it takes for the ball and the feather to reach the ground.
They repeat their experiment three times.
Here are their results.
object
ball
feather
time taken to reach the ground
in seconds
average time taken to
reach the ground
in seconds
experiment
1
experiment
2
experiment
3
2.6
2.4
2.5
2.5
25
23
24
24
(a) Explain their results.
Use ideas about air resistance.
[2]
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(b) Pierre makes this prediction,
‘If we repeat the investigation in a vacuum the ball and the feather will
both take the same time to reach the ground.’
Tick () to show if Pierre is correct.
Yes
No
Explain your answer.
[1]
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4
Look at the diagram.
It shows the position of the Sun, the Earth and the tides.
(a) Complete the diagram by showing the position of the Moon.
high tide
Sun
low tide
Earth
low tide
orbit of the
Moon
high tide
NOT TO SCALE
[1]
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(b) Look at the diagram.
It shows the Earth with extremely high tides.
NOT TO SCALE
orbit of the Moon
extremely high tide
low tide
Earth
low tide
extremely high tide
Complete the diagram to show the position of the Sun and the position of the Moon when
there is an extremely high tide.
Explain your answer.
[2]
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5
Chen uses his toy train to model the flow of electricity in an electrical circuit.
Chen pushes the train around the track.
(a) Draw a line to match the part of the model to the correct part of the electrical circuit.
part of the model
electrical circuit
train
wire
track
battery
Chen
electrons
[1]
(b) (i) Write down one strength of Chen’s model.
[1]
(ii) Write down two limitations of Chen’s model.
1
2
[2]
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6
Oliver investigates the current in an electrical circuit.
A1
A2
Ammeter A1 measures the current as 4 amps.
(a) Write down the measurement on ammeter A2.
amps [1]
(b) Oliver adds another lamp to the electrical circuit.
A1
A2
Describes what happens to the measurement on ammeter A1.
Explain your answer.
measurement on A1
explanation
[1]
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7
Look at the three food chains for a desert.
cactus
rat
hawk
cactus
grasshopper
cactus
rat
microorganisms
lizard
tarantula
hawk
snake
microorganisms
microorganisms
(a) Use the food chains to make a food web.
[3]
(b) There is a disease which kills all the grasshoppers in the desert.
Predict what happens to the number of lizards in the desert.
Explain your answer.
[1]
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(c) (i) What is the role of the microorganisms in a food web?
[1]
(ii) Explain why microorganisms are important in a habitat.
[1]
8
Jamila mixes two colourless solutions.
(a) (i) Complete these sentences.
The two solutions react to make a white solid.
The solid made does not dissolve in water because it is
This solid is called a
.
.
[2]
(ii) A reaction takes place when Jamila mixes the two solutions.
Describe one piece of evidence that shows a reaction takes place.
[1]
(b) What is the name of this type of chemical reaction?
[1]
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9
Blessy slowly adds sodium hydroxide solution to dilute hydrochloric acid in a beaker.
As she adds the sodium hydroxide solution to the acid, Blessy measures the pH of the mixture in
the beaker.
Look at the graph of her results.
14.0
12.0
10.0
8.0
pH
6.0
4.0
2.0
0.0
0
10
20
30
40
50
volume of sodium hydroxide solution added
in cm3
(a) Sodium hydroxide solution is an alkali.
Write down the name of the type of reaction that happens when sodium hydroxide solution
reacts with dilute hydrochloric acid.
[1]
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(b) Explain why the pH increases as the sodium hydroxide solution is added to the dilute
hydrochloric acid.
[1]
(c) What is the volume of sodium hydroxide solution added when the pH is 7.0?
cm3 [1]
(d) Blessy wants to know if her results are reliable.
Describe what Blessy does to get reliable results.
Explain how she will know if the results are reliable.
description
explanation
[2]
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10 The mountain zebra belongs to the species, Equus zebra.
(a) Define the term species.
[2]
(b) Growth is one characteristic of living organisms.
Write down three other characteristics of the living organisms shown in the pictures.
1
2
3
[2]
(c) A virus makes the mountain zebra become ill.
Mia thinks a virus is a living organism.
Tick () to show if Mia is correct.
Yes
No
Explain your answer.
[1]
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11 The combustion of gasoline in a car engine makes harmful gases.
Catalytic converters are fitted to cars to lower the mass of these harmful gases released into
the atmosphere.
Look at the graph.
20
18
16
14
12
mass of harmful
gases released 10
in g
8
6
4
2
0
no
catalytic
converter
two-way
catalytic
converter
three-way
catalytic
converter
A three-way catalytic converter is more effective than a two-way catalytic converter at lowering
the mass of harmful gases released.
Calculate how much more effective the three-way catalytic converter is compared to the two-way
catalytic converter.
Show your working.
[2]
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12 Hassan stands in the entrance of a tunnel and shouts his name into the tunnel.
A few seconds later he hears his name again.
Explain why.
[2]
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13 Safia and Pierre use boxes and pieces of cloth to model how fold mountains are formed.
Look at the diagram.
box
pieces of cloth
(a) Safia and Pierre push the boxes towards each other.
Use your scientific knowledge to predict what happens to the pieces of cloth.
[1]
(b) (i) What do the boxes in the model represent?
[1]
(ii) What do the pieces of cloth in the model represent?
[1]
(c) Suggest one way Safia and Pierre could improve their model.
[1]
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14 Read the hypothesis about how planets are formed.
About 4500 million years ago the Solar System was just gas and dust.
Small bits of gas and dust began to group together to form asteroids.
Gravity pulled some of the asteroids together to form planets.
Many asteroids are still found between Mars and Jupiter.
(a) Write down one reason why some scientists think this hypothesis may not be correct.
[1]
(b) Write down two reasons why some scientists think this hypothesis is correct.
1
2
[2]
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BLANK PAGE
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21
22
27
28
29
30
Db
Rf
137
88
133
87
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actinoids
lanthanoids
–
barium
caesium
Ra
Ba
Cs
radium
actinoids
56
55
–
89–103
88
85
Fr
104
57–71
strontium
rubidium
francium
105
178
89
Sr
Rb
cerium
140
90
Th
thorium
232
lanthanum
139
89
Ac
actinium
–
231
protactinium
Pa
91
141
praseodymium
Pr
59
58
Ce
57
–
dubnium
181
tantalum
Ta
73
93
niobium
Nb
41
–
rutherfordium
hafnium
Hf
72
91
zirconium
Zr
40
La
lanthanoids
yttrium
Y
39
51
vanadium
238
uranium
U
92
144
neodymium
Nd
60
–
seaborgium
Sg
106
184
tungsten
W
74
96
molybdenum
Mo
42
52
chromium
–
neptunium
Np
93
–
promethium
Pm
61
–
bohrium
Bh
107
186
rhenium
Re
75
–
technetium
Tc
43
55
manganese
–
plutonium
Pu
94
150
samarium
Sm
62
–
hassium
Hs
108
190
osmium
Os
76
101
ruthenium
Ru
44
56
iron
–
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
77
103
rhodium
Rh
45
59
cobalt
–
berkelium
Bk
97
159
terbium
Tb
65
–
roentgenium
Rg
111
197
gold
Au
79
108
silver
Ag
47
64
copper
–
californium
Cf
98
163
dysprosium
Dy
66
–
copernicium
Cn
112
201
mercury
Hg
80
112
cadmium
Cd
48
65
zinc
Zn
38
48
titanium
Cu
37
45
scandium
Ni
40
Co
calcium
Fe
39
Mn
potassium
V
23
Cr
Ca
K
Ti
31
20
Sc
27
24
23
19
26
magnesium
sodium
25
Mg
Na
24
12
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
aluminium
Si
14
13
Al
12
carbon
11
boron
11
relative atomic mass
name
9
7
atomic symbol
Be
beryllium
Li
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
lithium
atomic number
4
3
Key
2
1
The Periodic Table of Elements
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