PS RS P4L34 Revision 4 WS_2

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Topic: REVISION 4 (LESSON 34)

Rocket Science | Primary 4

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Primary 4: Rocket Science

Lesson Outline

• Notes
• Activity 1: Fun facts
• Activity 2: MCQS
• Activity 3: Open-ended Questions
• Activity 4: Science in daily life

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Primary 4: Rocket Science

Revision – Diversity

Plants

Non-Flowering Flowering/ Angiosperms

Spores- bearing Naked Seeds (Cones) 1 seed leaf 2 seed leaves

No roots With roots Monocotyledons Dicotyledons

Gymnosperms Have leaves
with network
Moss Ferns Have parallel veins
leaves
E.g. Staghorn E.g. Pine E.g. Beans
Fern Tree E.g. Grains Sunflower
Bird’s Nest Fir Tree Orchids
Spruce Grass Oaks
Fern Bamboo Buttercups
Banana
Sword Fern

Fungi

Break down Feed on Reproduce by are
food
into ar e Not plants and
Very small do not have
chlorophyll

therefore

Carried by

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Primary 4: Rocket Science

Micro-organisms

are cannot be seen with some are some are

Living Naked Useful
things eye Cause diseases like example

Sore throat, diarrhoea

Revision - Materials

• Glass is fragile, shiny and transparent.
• Metals are hard, strong, shiny and can be bent.
• Wood is strong but can be easily scratched.
• Fabrics are flexible, soft and water absorbent.
• Rubber is soft, flexible and elastic.
• Plastic is waterproof and versatile – it can be strong or soft, flexible or

rigid, and tough or easily broken.
• The more a material is able to bend without breaking, the more flexible

it is.
• The more weight or pressure a material can support before breaking,

the stronger it is.
• The less easily a material can be scratched or dented, the harder it is.

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Primary 4: Rocket Science

Activity 1 – Fun facts: Making Yoghurt

https://www.youtube.com/watch?v=1ZSoYrHyX9c
Match the following terms and their definitions

Homogenisation • Happens to the equipment to kill off
unwanted bacteria and microorganisms.
Lactic acid
bacteria • Process of a liquid turning into a more solid
state.

Coagulation • What does the lactic acid bacteria do to the
milk to make yoghurt?

Sterilisation • Added to the pasturised and homogenised
milk to turn lactose into lactic acid.

Pasturisation • Heating of the milk to kill off unwanted
bacteria and microorganisms.

Fermentation • Breaking down of fat droplets.

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Primary 4: Rocket Science

Activity 2 – MCQs

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Primary 4: Rocket Science

1. Look at the organisms below.

AR Model –
Mushroom

Mushroom Bacteria Mould

How are the above organisms similar?

(1) They reproduce by spores. AR Model –
(2) They do not need air and water. Bacteria
(3) They feed on other living things.
(4) They can only be seen under the microscope. (

)

2. Sam wanted to cut a wooden plank using object A.

X

Object A

(1) Wood
(2) Metal
(3) Fabric
(4) Rubber

( )

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Primary 4: Rocket Science

3. Study the classification chart as shown below.
Plants

Have strong stem Have weak stem

Live on Live in Flowers grow Flowers grow
land water singly in clusters

PQ RS

Which of the plant, P, Q, R or S best represents the plant shown below?

(1) P
(2) Q
(3) R
(4) S

( )

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Primary 4: Rocket Science

4. Tom conducted some tests on materials A, B, C and D and recorded his
results in the table as shown below.

Is it waterproof? A BCD
Does it break easily when dropped? Yes No Yes No
No No No Yes
Is it a good conductor of heat? No Yes Yes No

Which material is most suitable for making part W of a cooking pot?

(1) A W
(2) B
(3) C ()
(4) D

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Primary 4: Rocket Science

5. Study the flowchart about Materials A, B, C and D below carefully.
Materials

Does it No Is it No D
tear waterproof?

easily? Yes

Yes C

Can it bend No B
easily?

Yes
A
Which material is most suitable to make Part X of a tent?

Part X

(1) A (2) B ()
(3) C (4) D

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Primary 4: Rocket Science

6. Jason found a strawberry plant.

X

Which one of the following states the function of part X?

A: It makes food for the plant.
B: It holds the plant firmly to the ground.
C: It transports water and minerals to the roots.
D: It absorbs water and mineral salts from the ground.

(1) A and B only
(2) A and C only
(3) B and D only
(4) C and D only

( )

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Primary 4: Rocket Science

7. Three plants are classified in the chart as shown below.

ixora bird’s nest fern sunflower

Question 1 No bird’s nest fern

Yes No ixora
Question 2

Yes

sunflower AR Model – Sunflower
What are Question 1 and Question 2 likely to be?

Question 1 Question 2
(1) Is it a non-flowering plant?
(2) Is it a non-flowering plant? Does it have flowers that grow
(3) Is it a flowering plant? singly?
(4) Is it a flowering plant?
Does it have flowers that grow
in clusters? ( )

Does it have flowers that grow
singly?

Does it have flowers that grow
in clusters?

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Primary 4: Rocket Science

8. Study the chart below about plant parts carefully.
Plant parts

Do they absorb Do they take in C
water and mineral No
salts? and give out
No gases?

A Yes B Yes

Which of the following shows the correct match to the plant parts using
the above chart?

ABC

(1) Root Leaf Stem

(2) Stem Root Leaf

(3) Leaf Stem Root

(4) Root Stem Leaf

()

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Primary 4: Rocket Science

9. Metal is used to make part Z of the pair of scissors shown below.
part Z

Which property of metal is considered for part Z? ( )
(1) It is fragile.
(2) It is strong.
(3) It is flexible.
(4) It is transparent.

10. The picture below shows a fish aquarium.

X

Why is glass used for the part labelled ‘X’? AR Model – Aquarium

A. It can float. ()
B. It is flexible.
C. It is waterproof.
D. It is transparent.

(1) A and B only
(2) B and C only
(3) A and D only
(4) C and D only

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Primary 4: Rocket Science

11. An experiment is set up using four different materials, A, B, C and D

of the same length and thickness. When a 500-g weight is hung onto

each material, it bends as shown below. Then, the distance the material

bent is measured. distance bent

material

weight

The results of the experiment are shown in the table below.

Material A BCD
Distance bent (cm) 1 041

Based on the above results, which of the following statements is true?

(1) Material C is not flexible.
(2) Material B is most flexible.
(3) Material A is as flexible as Material D.
(4) Material C is less flexible than Material A.

( )

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Primary 4: Rocket Science

12. Four materials, P, Q, R and S, with the same mass are placed in a
pail of water. After ten minutes, they are removed and weighed. The
masses before and after the experiment are recorded in the table
shown below.

Material Mass of the material Mass of the material after
before it was placed in a being removed from the pail

pail of water (in grams) of water (in grams)

P 100 100
Q 100 125
R 100 150
S 100 200

Which material (P, Q, R or S) can be used to make a drinking mug?

(1) P
(2) Q
(3) R
(4) S

()

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Primary 4: Rocket Science

Activity 3 – Open-ended Questions
1. John placed a dead wooden log and a similar log made of plastic side by

side in his garden. He watered both logs daily.

Dead wooden log Plastic log

After a week, he found mushrooms growing on one of the logs while the
other log had nothing growing on it.

(a) Which log (wooden or plastic) are the mushrooms most likely to grow on?
[1]

(b) Explain your answer in (a). [1]

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Primary 4: Rocket Science

Study the diagrams of the mushroom and organism A and B below.

Mushroom Organism A Organism B

(c) State a difference between how the mushroom and organism A obtain

food. [1]

(d) State a difference between how the mushroom and organism B moves. [1]

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Primary 4: Rocket Science

2. Tim prepared the set-up as shown below. He hung loads of different mass
until strip A tore.

strip A

retort stand

hook
load

Strip Mass of loads until strip tears (g)
A 100
B 60
C 160

(a) Based on the table above, arrange the materials in order of their strength

from the strongest to the weakest. [1]

Strongest Weakest

(b) Which strip(s), A, B or C, can Tim choose to hang an object that weighs

90g? Explain your answer. [2]

(c) Other than being strong, state another property the material must have in

order to make the string used for fishing. [1]

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Primary 4: Rocket Science

3. The diagram below shows two different spectacles. One uses glass lens
while the other uses plastic lens.

Glass lens Plastic lens

(a) What is the common property that makes both glass and plastic suitable

for making spectacle lens that allow the user to see? [1]

(b) Apart from the property mentioned in part (a), state another property we

should consider when choosing the material for making the spectacle

lens. [1]

(c) The diagram below shows a pair of spectacles and goggles.

plastic rubber strap
frame

Give a reason why rubber is used to make the strap of the goggles [1]
instead of plastic.

2019

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Primary 4: Rocket Science

4. Gloria conducted an experiment using three strips made of different
materials, P, Q and R. Each strip had the same size. Each time, she hung
a 200 g weight from the end of the strip and made an observation.

Before 200 g weight
strip

Distance
After strip , d (cm)

200 g weight

(a) She then measured the distance the strip bent and recorded the results
of her experiment in the table below.

Material Distance the strip bent after weight was hung (cm)
P 1
Q 0
R 3

What property of material is tested in this experiment? [1]

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Primary 4: Rocket Science

(b) The picture below shows a water hose connected to a tap.

Based on the results, which material, P, Q or R, is most suitable to be used

to make a water hose? Explain your answer. [2]

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Primary 4: Rocket Science
Activity 4 – Science in daily life: How fire hose are made

https://www.youtube.com/watch?v=q4VuRYfIySA

Discussion Questions:

1. What is the outermost layer of the fire hose made of?

2. What property does this outer material have?

3. What is the inner tubing made of?
4. What is the purpose of adding adhesive pellets to the inner tubing

mixture?

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