Cambridge Lower Secondary Checkpoint

SCIENCE
1113/01
Paper 1
April 2020
45 minutes
You must answer on the question paper.
No additional materials are needed.
INSTRUCTIONS
 Answer all questions.
 Use a black or dark blue pen. You may use an HB pencil for any diagrams or graphs.
 Write your name, centre number and candidate number in the boxes at the top of the page.
 Write your answer to each question in the space provided.
 Do not use an erasable pen or correction fluid.
 Do not write on any bar codes.
 You should show all your working in the booklet.
 You may use a calculator.
INFORMATION
 The total mark for this paper is 50.
 The number of marks for each question or part question is shown in brackets [ ].
This document has 20 pages. Blank pages are indicated.
IB20 05_1113_01/3RP
© UCLES 2020
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2
1
The list contains the names of different parts of a cell.
cell membrane
cell wall
chloroplast
Complete the table by placing ticks () in the correct boxes.
where the part of the cell is found
part of a cell
only in animal
cells
only in plant
cells
in both animal
and plant cells
cell membrane
cell wall
v
chloroplast
v
[2]
2
This question is about the properties of metals.
(a) Draw straight lines to match the property of a metal with its correct use linked to that
property.
property of a metal
use
drill bit
sonorous
bridge across a river
strong
electrical wires
ductile
bell
hard
[2]
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3
(b) Metals are used to make electrical wires because they conduct electricity.
plastic
metal
Write down two reasons why plastic is put around electrical wires.
1
Good insulator of heat
2
Does not conduct electricity
Can be colored
[2]
(c) Read the sentences about the physical properties of metals.
Tick () the box next to the correct sentence.
All metals have low melting points.
Some metals are gases at room temperature.
All metals conduct heat.
v
All metals are brittle.
[1]
© UCLES 2020
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4
3
Blessy uses the internet to find out about our Solar System.
She finds a very old model of our Solar System.
Jupiter
Mercury
Mars
orbits
Earth
Moon
Venus
Sun
Saturn
Scientists thought that the Earth was at the centre.
The orbits in the old model show the other objects moving around the Earth.
(a) Scientists today know that the Earth is not at the centre of our Solar System.
What is at the centre of our Solar System?
The Sun
[1]
(b) Write down two other things that are incorrect in the old model.
1
2
This model suggests that the moon is a planet
The sun does not orbit the earth
The earth and the sun have switched positions
The orbital distances are not to scale
[2]
(c) Write down one thing that is correct in the old model.
Saturn is after Jupiter in the order of orbits
© UCLES 2020
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[1]
5
4
This question is about blood vessels.
Won't come
(a) Draw a straight line from each cross section of a blood vessel to the correct letter showing
where the blood vessel is found.
blood vessels
cross sections
of blood vessels
A
from heart
direction
of blood flow
B
C
to heart
[2]
(b) Name the types of blood vessel labelled A and C.
A
C
Veins
Capillaries
[2]
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5
The picture shows three different elements and their state at room temperature.
solid iodine
liquid bromine
chlorine gas
(a) Which two of these elements flow easily at room temperature?
Bromine
AND CHLORINE
[1]
(b) What is the chemical symbol for chlorine?
Cl
[1]
(c) Chlorine gas fills the jar.
Explain why a gas fills a jar.
Tick () the box next to the correct explanation.
Forces between the particles push them apart.



The particles are free to move.
v
The particles can easily be squashed into a small space.
The particles increase in size to fill the space.




[1]
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(d) Liquid bromine easily evaporates.
Explain what happens to the particles (molecules) when a liquid evaporates.
When a substance evaporates, its particles vibrate faster and move around faster
This causes the substance to increase in volume and occupy its container.
This is because, as particles increase in thermal energy, they increase their kinetic
energy which causes evaporation changing the substance into a gas
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[2]
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8
6
Mia investigates sound.
oscilloscope
loudspeaker
microphone
She makes a sound using a loudspeaker.
The sound is detected by the microphone.
(a) Describe how the sound travels from the loudspeaker to the microphone.
As the loudspeaker produces sound, it travels as form of waves that vibrate the air
which can be read by the microphone
[2]
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(b) Mia draws the wave she sees on the oscilloscope.
(i) She makes the sound louder.
Draw this wave on the oscilloscope.
[1]
(ii) She makes the sound a higher pitch.
Draw this wave on the oscilloscope.
[1]
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7
This question is about the life cycle of a plant.
(a) These processes take place in the life cycle of a plant.
fertilisation
pollination
seed formation
seed germination
Put the processes in the order in which they occur in the life cycle of a plant.
One has been done for you.
seed
germination
pollination
....................
fertilization
....................
seed formation
....................
[1]
(b) The diagrams A and B show two different types of seed.
A
B
Suggest the method of dispersal for each type of seed.
Give a reason for each answer.
method of seed dispersal
A
Self pollination
reason
The plants are close to each other
B
[2]
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8
Look at the diagram of the structure of a lithium atom.
nucleus
(a) There are three electrons in a lithium atom.
(i) How many protons are there in a lithium atom?
3
[1]
(ii) How many neutrons are there in a lithium atom?
4
[1]
(b) A sodium atom contains 11 protons.
Draw the structure of a sodium atom.
[2]
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9
Mike investigates the strength of magnets.
magnet
hand
paper clip
Mike

puts the magnet on top of his hand

puts the bottom of his hand onto 24 paper clips

lifts his hand up

counts how many paper clips have been attracted

repeats with different magnets.
Here are his results.
© UCLES 2020
magnet
number of paper clips
A
24
B
24
C
7
D
19
E
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13
(a)
Mike concludes that magnet A and magnet B are both strong.
He cannot conclude which of these two magnets is stronger.
(i) Explain why he cannot conclude which magnet, A or B, is stronger.
It is because they both held the maxiumum amount of paper clips
[1]
(ii) Describe what he could do to find out which magnet, A or B, is stronger.
Keep on adding more paperclips until one of them cannot hold anymore
[1]
(b) Pierre repeats Mike’s investigation.
Here are Pierre’s results.
magnet
number of paper clips
A
18
B
22
C
1
D
13
E
6
Pierre uses the same magnets as Mike.
Pierre uses the same paper clips as Mike.
The results are different.
(i) Describe one difference between the results.
His results show that the amount of paper clips were attracted less
[1]
(ii) Suggest why the results are different.
Pierre's hand could have been bigger than Mike's
[1]
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10 Egg white contains a protein.
An enzyme digests protein in the stomach.
Class 9 investigate how changing the pH affects the time it takes for the enzyme to digest egg
white.
The graph shows the results of their investigation.
10
9
8
7
6
time to
digest egg 5
white in
minutes 4
3
2
1
0
0
1
2
3
4
pH of mixture
5
6
(a) (i) Which pH has the shortest time of digestion?
pH
2.2
[1]
(ii) The class want to be certain that they have found the shortest time.
Describe two things the class does to be certain.
1
Repeat the experiment atleast three times to ensure the data is reliable
2
Use different temperatures or different concentrations of enzyme to ensure 2
is the shortest
Test at 2 pH
© UCLES 2020
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15
(b) (i) State one safety risk of using liquids with a very low pH.
Acid burns. Skin Corrosion
[1]
(ii) Describe one way of reducing this safety risk.
Wearing gloves
[1]
(c) State one variable the students must control in this investigation.
Temperature of the acids
[1]
Water
© UCLES 2020
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11 Jamila and Ahmed investigate displacement reactions.
They put drops of different solutions into the dimples of a spotting tile.
They then add metals to each solution.
The diagram shows their experiment.
zinc magnesium copper
metal
metal
metal
iron
metal
dimple
zinc nitrate
solution
magnesium nitrate
solution
Key
copper nitrate
solution
empty dimple
iron nitrate
solution
dimple with
metal and solution
spotting tile
(a) Jamila and Ahmed look to see if a reaction takes place.
Suggest what they might see if a reaction takes place.
Effervecence.
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(b) They record their results in a table.
They put a


tick () if there is a reaction
cross (x) if there is no reaction.
Here are some of their results.
metal
solution
zinc
zinc nitrate
magnesium nitrate
magnesium
copper
iron

x
x
x
x
copper nitrate


iron nitrate


x

x
(i) Complete the table to predict the results for magnesium nitrate.
[1]
(ii) The reactivity series shows the metals in order of reactivity.
Which of the four metals is the lowest in the reactivity series?
Copper
© UCLES 2020
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18
12 Complete the light rays in the three diagrams.
(a)
reflection
mirror
normal
[1]
(b)
refraction
air
water
[1]
(c)
shadow formation
screen
light source
opaque
object
[2]
13 Complete the word equation for aerobic respiration.
glucose
+
Oxygen
....................
Carbon dioxide
....................
....................
....................
+
Water
....................
....................
[2]
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© UCLES 2020
1113/01/A/M/20