PS AR RSO P6L25_26 Review 2 WS

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Rocket Science OEQ

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Topic: REVIEW 2 (LESSON 25-26)

REVIEW 2 (LESSON 25-26)

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Primary 6: Rocket Science OEQ

1. Study the characteristics of P, Q, R and S in the table below.

Characteristics

Can Can make its Can move freely from one
reproduce own food place to another

P Yes Yes No

Q Yes No Yes

R Yes No No

S No No No

Plant Animal Fungi
(1) P Q R
(2) Q R S
(3) S P R
(4) P Q S

( )

2. The diagram below shoes two insects and their youngling.

Insect P Insect Q

Which of the following statements about both insects is correct?

(1) Both insects have a four-stage life cycle.
(2) Both young and adults moult many times.
(3) Both adults have wings while the young do not.
(4) Both have a stage in which the young do not eat or move.

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3. The diagram below shows how food and gases are transported in the human
body through System P and System Q. Gases Y and Z are exchanged between
System P and System Q..

Which of the following best represents P , Q, Y and Z?

System P System Q Gas Y Gas Z
Carbon dioxide
(1) Respiratory Circulatory Carbon dioxide Oxygen
system system
Oxygen Oxygen
(2) Circulatory Respiratory Oxygen
system system Carbon
dioxide
(3) Circulatory Respiratory Carbon
system system dioxide

(4) Respiratory Circulatory
system system

()

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Primary 6: Rocket Science OEQ

4. The diagram below shows the gill filaments and air sacs in the body systems of a
fish and human respectively.

gill filaments air sacs

Which of the following statements about both parts is incorrect?

(1) They have a lot of blood vessels surrounding them.
(2) They increase the surface area to absorb more oxygen.
(3) They are parts of the circulatory systems of the organisms.
(4) They are parts of the respiratory systems of the organisms.

()

5. Study the circuit below.

B

AD

C

Which of the following is correct?

Bulbs blown Number of bulbs which remain lit
(1) A 2
(2) B 2
(3) C 3
(4) D 3

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Primary 6: Rocket Science OEQ

6. Study the food web below.

K J L Q
M S N R

P

Which statement is correct?

(1) P and S are food consumers.
(2) K and Q are food producers.
(3) Q and R are decomposers.
(4) J and R are plant eaters.

( )
)
7. A 3500 cm3 container, filled with 800 cm3 of water, is sealed with an air-tight cover
with an attached plunger.

Sam removed 500 cm3 of air from the container as shown in the set-up below.

plunger

500 cm3 of air removed
from the container

container air-tight container

800 cm3 of water

Which of the following statements are correct?

A: Mass of air in the container decreased.
B: Mass of air in the container remained the same.
C: Volume of air in the container decreased.
D: Volume of air in the container remained the same.

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

(

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8. Christina threw a ball from Point A to B as shown below.

Which statement(s) is/are correct?

A: The change in direction of the ball is an effect of a force acting on it.
B: The amount of kinetic energy in the ball decreased from Point A to Point B.
C: The gravitational force acting on the ball increased from Point A to Point B.

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

()

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9. Annie saw different organisms in the school pond and plotted the numbers in the
bar graph as shown below.

20
15
10

5
0

dragonflies
tadpoles

dragonfliy
nymphs
water lilies
duckweeds
guppies
pondskaters
great diving
beetles

frogs

Based on the above graph, which of the following statements is correct? ( )
(1) There are 2 populations of food producers.
(2) There are 9 populations of living organisms.
(3) There are 7 populations of food consumers.
(4) There are 7 communities of living organisms.

10. Many cars are fitted with object P as shown in the diagram below.

object P

In a collision, object P inflates and helps to absorb the impact when the
passenger jerks forward. What are the properties of the material used to make
object P?

(1) Soft and strong
(2) Soft and smooth
(3) Flexible and strong
(4) Flexible and smooth

( )

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11. Sanjit set up the following experiment.

Block R was released from the top of a slope. It moved down and hit marble P at
the bottom of the slope.

height of slope R
P

T

surface S

After being hit by R, P rolled along surface S, before coming to a stop at point T.
Sanjit came up with four ways to change the experimental set-up.

A: Increasing the mass of R
B: Decreasing the mass of P
C: Decreasing the roughness of S
D: Increasing the height of the slope

Which of the above ways would help to increase the distance moved by P along
surface S?

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

(3) A, C and D only
(4) A, B, C and D

( )

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12. Study the flowchart below.
Animal

Does it Yes Does it have Yes
lay a 3-stage life C

eggs? cycle?

No No
A

Does the young
look like the
adult?

No
B

Based on the information given in the flowchart, which one of the following
correctly represents animals A, B and C?

A B C
(1) Frog Butterfly Cockroach
(2) Lion Cockroach
(3) Duck Cockroach Butterfly
(4) Dolphin Mosquito Mosquito
Cockroach

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13. Study the picture below carefully. Stiff hair

Feathery
structure

Seed PPoodd

Species 1 Species 2 Species 3

The dispersal patterns of the three fruits are shown below.

Pattern X Pattern Y Pattern Z

Legend:

Seedling
Parent plant
Direction of
wind

Which fruits would produce dispersal patterns X, Y and Z respectively?

XY Z

(1) A B C

(2) B C A

(3) B A C

(4) C A B

( )

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14. Siti used two similar plants in set-ups A and B as shown below. The set-ups were
placed near an open window in sealed containers made of different materials X
and Y. Solution Z is a colourless substance which turns chalky in the presence of
carbon dioxide.

After 5 hours, Siti observed that Solution Z in set-up A remains colourless but
the solution in set-up B turned chalky.

What could materials X and Y possibly be?

Material X Material Y
(1) Metal Wood
(2) Clear glass Metal
(3) Wood
(4) Clear glass Clear glass
Clear glass

( )

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15. The graph below shows the effect of temperature on three different organisms
A, B and C.

number of
population

C

0 40 B

temperature ( °C)

Based on the graph above, which of the following statements is correct?

(1) Organism A survives better in increasing temperature.
(2) Organism B increases in population as the temperature increases.
(3) Organism C increases in population as the temperature increases.
(4) The populations of all organisms are affected by changing temperature.

( )

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16. The diagram below shows a ladder leaning against a wall.

wall D ground

Ladder leaning
against the wall
C

BA

Which two arrows, A, B, C or D, show the frictional force that prevent the ladder )
from sliding downwards?

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

(

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17. An experiment was carried out to determine how light affects the growth of three
different types of bean plants. Each type of bean plant was planted in cups
labelled A, B and C. The cups were left in each of three locations to receive
different amounts of light.

Which of the following best shows how the plants should be arranged for the
experiment?

(1) B C

A Location 2 Location 3

Location 1

(2) ABC ABC

ABC Location 2 Location 3

Location 1

(3)

AAA BBB CCC

Location 1 Location 2 Location 3

(4) BC AC

AB Location 2 Location 3

Location 1 (

)

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18. Andy set up the following experiment to observe the changes in the amount of
oxygen inside a flask containing a green plant as shown below. A sensor is used

to measure the amount of oxygen. The set-up was placed in a dark room.

lamp

data logger

sensor

flask green plant
test-tube filled with water

The graph below shows the data recorded by the sensor when Andy increased
variable Z while keeping all other variables constant.

amount of
oxygen (units)

variable Z

What could variable Z be?

(1) Number of green plants
(2) Amount of air in the flask
(3) Amount of water in the test tube
(4) Distance of the lamp from the flask

( )

19. Which of the following will least likely cause an increase in carbon dioxide )
produced on Earth?
15
(1) Soil erosion
(2) Loss of forests
(3) Presence of factories
(4) Heavy traffic on the roads

(

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20. Study the circuit diagram below.

Three rods F, G and H are placed in different positions P1, P2 and P3. A tick in
the table below indicates if the bulbs B1, B2 or B3 is/are lit.

Position where rods are placed B1 Bulb B3
P1 P2 P3 B2
FGH
GH F

Based on the results above, which one of the following classifications of the
electrical conductivity of materials F, G and H is correct?

Conductor of electricity Insulator of electricity

(1) H F, G
(2) G F, H
(3) F, G
(4) F, H H
G

( )

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21. Suzanna set up an experiment using four similar leaves A, B, C and D. These
leaves have more openings known as stomata on their bottom surfaces than on
their top surfaces. Leaves lose water through the stomata.
She coated some surfaces of the leaves with oil that did not drip. Each leaf was
weighed and then hung up in an open area as shown below.

A B C D stand
oil on top no oil
oil on oil on
top bottom and
surface surface bottom
surfaces

After six hours, each leaf was weighed again, and the loss of mass was
recorded.

Which one of the following shows the correct order of decreasing loss of mass
for leaves A, B, C and D? (Start from the largest loss of mass.)

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

( )

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22. Jessica sets up an experiment using a balance and three magnets, J, K and L. All
three magnets have the same mass and size.

balance

magnet J weight

Diagram 1

balance
weight

magnet J

magnet K

Diagram 2

When magnet K is placed below magnet J as shown in Diagram 2, the distance
between the two magnets is 5 cm. When magnet K is then replaced by magnet L,
the distance between magnet J and magnet L is 2 cm.

Which of the following statement(s) is/are true?

A: There is a force of repulsion between magnet J and magnet K.
B: Magnet L can attract more steel clips than magnet K from the same distance.

C: When magnet K is turned around such that Q faces magnet J, the balance will
tilt downward at the weight.

(1) B only
(2) A and C only

(3) B and C only
(4) A, B and C

( )

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23. Meiling used two glass tanks, X and Y to study the food relationships among the
plant and three other organisms, A, B and C. Her observations are as shown in

the table below.

Glass tank Day 1 Day 2

X • 4 freshly-plucked leaves • No leaves left
• from a plant • 1 living organism B
1 living organism B

• 1 living organism A

• 1 living organism B • 1 living organism C

Y • 1 living organism C • 4 freshly-plucked
• 6 freshly-plucked leaves leaves from a plant

from a plant

Which of the following shows a possible food relationship among the plant, A, B
and C?

(1) (2)

(3) (4)
A

Plant B

C

()

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24. Sam built a puzzle circuit with three identical bulbs and an electrical source.
He covered the connections to the bulbs with a piece of card as shown below.
The bulbs could be seen through holes in the card.

A
C

Card
B

All the bulbs were lit up at first. Each bulb was then removed, and the results
were shown below.

Bulbs A B C
Remove A Lit up Lit up
Remove B Lit up Did not light up
Remove C Lit up Did not lit up

If none of the bulbs were removed, which bulb(s) would be the brightest?

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

( )

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25. Which one of the following graphs shows what happens to the amount of
undigested food as it goes through the digestive system?

(1)
Amount of
undigested
food

Mouth Gullet Stomach Small Large
intestine intestine
(2)

Amount of
undigested

food

Mouth Gullet Stomach Small Large
intestine intestine

(3) Amount of
undigested
food

Mouth Gullet Stomach Small Large
intestine intestine

(4) Amount of
undigested
food

Mouth Gullet Stomach Small Large )
intestine intestine
(

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26. Joanne conducted an experiment using the following set-up below..

Beaker X metal tray
blue water water droplets
Beaker Y

She recorded the amount of water collected every two minutes.

After ten minutes, Joanne made a few observations. Which of these observations
are true?
.

A: The liquid in Beaker Y is blue.
B: The liquid in Beaker Y is colourless.
C: The amount of water collected throughout were the same.
D: The amount of water collected within the first few minutes was more than the

last few minutes.

(1) A and C only
(2) A and D only

(3) B and C only
(4) B and D only

()

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27. Sahid pushed a toy, which was attached to a spring, into a cup and closed the lid
as shown in Diagram 1. When he opened the lid, the toy jumped up as shown in

Diagram 2.

lid toy toy

cup cup
spring spring

Diagram 1 Diagram 2

Which one of the following shows most accurately the energy conversion of the )
toy when the cup is opened?

(1) Elastic potential energy  gravitational potential energy
(2) Elastic potential energy  kinetic energy  gravitational potential energy
(3) Chemical potential energy  kinetic energy  gravitational potential energy
(4) Chemical potential energy  elastic potential energy  kinetic energy 

gravitational potential energy

(

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28. The set-up below shows light shining on three wooden objects A, B and C.
They are placed at different distances from the torch.

screen

10cm 10cm 10cm

torch ABC

The diagram below shows the shadow of the objects on the screen.

What are objects A, B and C? B C
A

(1)
(2)
(3)
(4)

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29. Toby wanted to find out the strength of 4 strings, A, B, C and D. He suspended 1kg
weights from the middle of each string until it breaks.

string

pole

weights

The results were recorded in the table below.

Type of string AB CD
7 20
Number of 1kg weights 9 13
added before string breaks

(a) State one variable of the string that should be kept constant to conduct a [1]
fair test.

(b) Explain why both poles must be kept at the same distance apart when Toby

tested each type of string. [1]

(c) Toby wanted to catch a fish weighing 15 kg. [1]
Which string, A, B, C or D should he use? Explain your answer.

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30. Andy created a set-up as shown in the diagram below. .

(a) Explain why paper clips were attracted to the steel bar when the switch is [1]
closed.

(b) State two ways in which Andy can increase the number of paperclips [1]
attracted to the steel bar.

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(c) Andy found that some of the doors in his school were locked using electrical
circuits. The diagram below shows such a door in his school.

steel bar 1 steel bar 2
door
button to
open door

His teacher told him that the door works similarly to his set-up as shown below.

Explain why the door will be unlocked when Andy pressed the button. [2]

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Primary 6: Rocket Science OEQ

31. Anna was given a set up as shown in the diagram below.

string

container water
Object R Object S

(a) Anna took out Object R and Object S one at a time and concluded that [1]
Object R has a larger volume. Explain how she came to the conclusion.

(b) Which similar property of both solid and liquid did Anna use to obtain her [1]
conclusion in (a)?

(c) Suggest one change she can make to the set-up to find out the actual [1]
volume of each object.

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32. The diagram below shows a solar still. It is used to obtain drinking water in very
hot places. Drinking water obtained by this method can be pumped above the

ground to be used.

Metal pipe fan

Water pump

Container Above
with ground

seawater Cooler
underground
dWropalteetrs
Metal
underground

pipe

Drinking [2]
water

(a) Explain how drinking water can be collected from seawater using
the solar still.

(b) How does having a fan increase the amount of drinking water collected? [1]

(c) Without increasing the number of fans, suggest another way to increase the

amount of drinking water collected. [1]

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33. Kelly set up the experiment as shown below.

Celery leaves

Thin celery stalk Thick celery stalk

Blue-coloured
water

Beaker P Beaker Q

(a) She observed that the leaves on both celery stalks turned blue after a few days.

What caused this observation? [1]

(b) Kelly drew a line graph to show the changes in the amount of water in [1]
both beakers.

(i) Put a tick ( ) below the graph that correctly shows her observations.

wawAmaamttoeeourrnu((tcncmotmf3o)³f) Aammoouuntnotfof aAmmouonutnotf of Key
wwaatteerr ((ccmm3)³) wwaatteerr(c(cmm3)³) Beaker Q

Beaker P

tiTmiem(eda(dysa)ys) timTeim(dea(ydsa) ys) tiTmiem(eda(dysa)ys)

(ii) She observed that the leaves on both celery stalks turned blue after a few days.

What caused this observation? [1]

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34. The graph below shows Martha’s pulse rate changed over a period of 30 minutes.

Pulse rate (units)

C

Time [1]
0 5 10 15 20 25 30 (min)

(a) Match the activity given below to the graph above by filling in the blanks with
the period, AB, BC or CD.

Activity Period in the graph
Resting after playing badminton

(b) Martha’s pulse rate increased while playing badminton with her friends. [2]
Explain why this happened.

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Primary 6: Rocket Science OEQ

35. Vanessa prepared a set-up as shown below to find out if both Liquid Y and
Container X conduct electricity.

Bulb

Metal clips batter
Container X

Liquid Y

She connected the metal clips as shown above and the bulb lit up.

(a) Can Vanessa conclude that both Container X and Liquid Y conduct electricity?

Explain why. [2]

(b) Without adding any items to the set-up, what should Vanessa do to meet the

aim of her experiment? [1]

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36. The diagram below shows islands A and B. Primary 6: Rocket Science OEQ
plant X
plant Y
island A island B

(a) Based on the diagram above, state a possible dispersal method of plant Y. [1]
Give a reason for your answer.

(b) After a few years, plant X could be found growing on island B. Suggest one way

how plant X could have started growing on island B. [1]

(c) List one characteristic of the dispersal method in (b). [1]

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Primary 6: Rocket Science OEQ

37. A block is placed on a wooden table as shown below. The rubber band is stretched
when the block is pulled against the rubber band.

block Rubber band Wooden table

(a) What are the two forces that can act on the block when it is released. [1]

(b) The wooden table is covered with sandpaper while all the other variables are
held constant. Will the block travel over a longer distance? Explain your answer. [1]

John decides to repeat the experiment using blocks of the same mass and material,
but different area of contact with the wooden table. His results are shown below.

Block Area of contact with the table (cm2) Distance moved (cm)

X 120 14

Y 80 14

(c) Based on John’s results, did the area of contact with the table affect the friction

on the block? Explain how you came to your conclusion. [1]

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John then wanted to know how the distance from the block and the end of the
wooden table (distance W) will affect the distance travelled by the block.

block Rubber band Wooden table

He recorded his findings in the table below.

Distance W (cm) Distance travelled by the block (cm)
5 25
10 32
15 40

(d) What is the relationship between distance W and the distance travelled [1]
by the block?

(e) Explain your answer in (d). [1]

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Primary 6: Rocket Science OEQ

38. A balloon is glued firmly to a straw. At point A, air is released from the balloon.
This caused the balloon to move forward. The balloon continued to move forward

and finally stopped at point C.

Horizontal B C
string

A
straw

Rubber balloon
band

(a) After moving some distance, no more air was released from the balloon at B.

Explain why the balloon was still able to move from point B to point C and then

eventually stopped at point C. [2]

(b) Using the same apparatus in the above set-up, suggest a way to make the [1]
balloon at point A move further than point C. Explain your answer

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Primary 6: Rocket Science OEQ

39. Shaqeem wanted to find out if material X, which contains pockets of air, affects how
cold water gain heat. He conducted an experiment using two identical containers as
shown below. Container P was covered with material X while container Q was not.
Both containers were filled with 100 ml of cold water.

thermometer

material X

100ml of Container Q
cold water
Container P

Shaqeem placed both containers in a science room. He recorded the temperature of
water in both containers at different times. His results are shown in the graph below.

Temperature
(°C)

Time (min) [2]

(a) Based on Shaqeem’s results, what can he conclude about material X?
Explain your answer.

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Bird S has a thick layer of feathers as shown below. There are air pockets among the
feathers.

(b) Based on the results of Shaqeem’s experiment, explain how the air pockets [1]
keep bird S warm in a cold surrounding.

(c) As winter is approaching, bird S flies to other places that are warmer as it
cannot survive in the cold temperature.

Besides keeping warm, suggest another reason why bird S flies to other places [1]

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Primary 6: Rocket Science OEQ

40. A pile of fallen leaves was left on a patch of heathy green grass in Gerald’s
garden.

fallen leaves grass patch

After one week, Gerald removed the fallen leaves and found the patch of grass directly
underneath the fallen leaves had turned yellow.

(a) Explain why the grass under the fallen leaves had turned yellow. [1]

Gerald’s father told him to sweep all the fallen leaves, to gather them underneath their
mango tree in the garden so that the mango tree will grow well

mango tree

fallen leaves

(b) Explain how the presence of fallen leaves would be helpful to the growth of [1]
the tree.

(c) Gerald’s father then tore the fallen leaves into smaller pieces before putting the

pieces underneath the tree. Explain why Gerald’s father tore the fallen leaves

into smaller pieces. [1]

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Primary 6: Rocket Science OEQ

41. In the diagram below, animal B lives on the skin of the rhinoceros and makes the
rhinoceros skin itch.
Enlarged view

Animal A

Rhinoceros

Animal B

(a) Base on your observation above, explain how animal A and the rhinoceros [2]
benefit from each other.

(b) Animal B can also be found on the skin of zebras.
Zebra

How do zebras living in large groups affect the population of animal A? [1]
Explain why.

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