This P5 Science CA1 paper from Raffles Girls (2025) contains 9 questions worth 25 marks. Use it as a study reference for Science topics typically tested at P5 level in Singapore schools.
Q1Structured3 marks🖼 Visual
1. The diagram below shows the human reproductive systems.
Male reproductive system
Female reproductive system
(a) (i) Name part Y.
(ii) State the function of part Y.
(b) Which part of the female human reproductive system, X, Y or Z, has
the similar function as part A?
(c) What will happen if both parts, labelled A, in the male reproductive system are removed?
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2. The diagram below shows the cross-section of two flowers from plant A. The male
and female parts of the flower mature at different times of the year.
Flower 1
Flower 2
(a) In the diagram above, draw an arrow to show the process of pollination between flower 1 and 2.
(b) In the diagram above, label and name the part of the flower 1 that will develop into a fruit.
(c) Apart from pollination, name another process that needs to take place before a fruit can be formed.
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3. Ben studied the distribution of plants P, Q and R in an area over a year.
His observations are shown below.
Key:
direction of river flow
Plant P
Plant Q
Plant R
Observations:
At the start of the year:
River
At the end of the year :
River
(a) Based on the information above, state the method of seed dispersal of plant
P and Q in the table below.
Plant
Method of seed
dispersal
P
Q
By
By
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Continued from page 3
Plant R produced the seed as shown below.
length of wing
Ben carried out an experiment, in an enclosed laboratory, to find out if the
length of the wing of the seed would affect the distance travelled by it.
He recorded the results in the table below.
Length of wing (cm)
3.0
3.4
3.8
4.2
Distance travelled by the seed (cm)
10
18
25
38
(b) Based on Ben's experiment, state the following:
(i) Independent/ Changed variable:
(ii) Dependent /Measured variable:
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Continued from page 4
(c) Based on Ben's results, what is the relationship between the length of the wing and the distance travelled by the seed?
(d) Ben carried out another experiment to find out if the height at which the seed from plant R is dropped affects the distance it travels.
In the table below, tick (✔) the correct boxes to identify the constant variables.
Variables
Tick (✔)
(i) Height at which the seed is dropped
(ii) Distance travelled by the seed
(iii) Size of the seed
(iv) Amount of wind
(v) Length of wing
(vi) Mass of seed
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4. Claire carried out an experiment in the laboratory with a constant room temperature of 25°C as shown below.
sealed flask filled with air
retort
stand
flame
tube
water
(a) Tick (✔) the box(es) below to indicate if the objects would gain or lose heat. [1]
Flask
Air in the
flask
Gained heat
Lost heat
(b) State an observation in the water after some time.
(c) Explain the observation in (b).
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Continued from page 6
(d) Draw a line on the graph below to indicate any change in the temperature of
the air in the flask over time when a flame was brought near to the flask. [1]
Temperature of the air
in the flask (°C)
0
Time (s)
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5. John sprayed some water from a spray bottle onto some meat on a grill cooker
to keep them from burning while cooking as shown below.
fire
food
water droplets
grill cooker
spray bottle
(a) He noticed that the water droplets on the meat disappeared after some
time. Explain his observation.
(b) Name the change of state of water that took place in part (a).
(c) John used a different spray bottle and sprayed the same amount of
water droplets onto the meat. However, the water droplets are of
smaller size.
Did the water droplets on the meat disappear faster or slower? Explain
your answer.
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6. Sally opened the windows in the laboratory before she carried out an experiment.
She took a can of drink out from the fridge and placed it on a digital balance as
shown.
cold drink
digital balance
310g
She immediately took the reading on the digital balance and recorded it in the
table below.
After five minutes, she recorded the reading on the digital balance again as shown
below.
Reading on the digital balance(g)
At the start
310
After 5 minutes
313
(a) Explain why there is an increase in the reading on the digital balance
after five minutes.
(b) Sally repeated the experiment in an enclosed air-conditioned laboratory
using a similar can of drink taken out from the fridge.
She observed that after five minutes, the reading was more than 310g
but less than 313g, compared to the previous experiment. Explain her [2]
observation.
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