2011-p5-science-sa1-rgps

43
Name RAFFLES GIRLS' PRIMARY SCHOOL SEMESTRAL ASSESSMENT (1) 2011 Index No: Class: P5 tfT 6m May 2011 SCIENCE Attn: 1h 45 min SECTION A (30 X 2 marks) For each question from 1 to 30, four options are given. One of them is the correct answer. Make your choice (1, 2, 3 or 4). Shade the correct oval on the Optical Answer Sheet. 1 The diagram below shows how some living things respond. how living things respond to touch to light I I Section A 60% Section B 40% Highest score Average score Parent's signature Your score out of 100 Class Level Basedon the diagram above, which one of the following does NOT belong to both groups X and Y? (1) moss (3) millipede (2) (4) Page 1 of 37 mimosa toadstool 2011 P5 Science SA1

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Page 1: 2011-P5-Science-SA1-RGPS

Name

RAFFLES GIRLS' PRIMARY SCHOOL

SEMESTRAL ASSESSMENT (1)2011

Index No: Class: P 5

tfT6m May 2011 SCIENCE Attn: 1 h 45 min

SECTION A (30 X 2 marks)For each question from 1 to 30, four options are given.One of them is the correct answer. Make your choice (1, 2, 3 or 4).Shade the correct oval on the Optical Answer Sheet.

1 The diagram below shows how some living things respond.

how living things respond

to touch to light

I I

Section A

60%

Section B

40%

Highestscore

Averagescore

Parent's

signature

Your

score

out of 100

Class Level

Based on the diagram above, which one of the following does NOT belong toboth groups X and Y?

(1) moss

(3) millipede

(2)

(4)

Page 1 of 37

mimosa

toadstool

2011 P5 Science SA1

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2. The flow chart below differentiates some animals.

animals:

A, B, C, Dyes

^ Does it lay eggs? Does it fly?yes

> A

u no ,r noyes

Does it have hair? Does it swim?yes

D * —•

no no

B

emu

In which group, A, B, C or D, does the animal shown below belong to?

(1) A

(3) C

(2) B

(4) D

Page 2 of 37

2011 P5 Science SA1

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3. The table below gives information on four different types of plants, A, B, C andD, based on two characteristics.

A tick K) in the box shows that the plant has that particular characteristic.

characteristicplants

A B C D

bears fruit • S

grows on land • s

Based on the information above, which groups do plants Band C belong to inthe classification table below?

(1)

(2)

(3)

(4)

plants

11 1

flowering non-flowering

i1

i1 1 I

aquatic non-aquatic aquatic non-aquatic

1 1 1

w

plant B plant C

W Y

X Z

Y X

Z w

Page 3 of 37

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The diagrams below show two green plants, X and Y, growing in a garden.

plant Y

flower

plant Xfruit tree trunk

Which of the following statement(s) can be inferred from the given informationon both plants?

A They have weak stems.

B They make their own food.

C They reproduce by spores.

(1) C only

(3) A and C only

(2) A and B only

(4) A, B and C

Which of the following statements about bacteria are true?

A Bacteria are micro-organisms.

B Bacteria cannot grow in water.

C All bacteria found in our bodies are harmful.

D Bacteria can be seen with the help of a powerful microscope.

(1) A and B only

(3) B and C only

(2) A and D only

(4) C and D only

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6. The diagram below shows the 3 stages in the life cycle of an animal.

stage 3

stage 2 stage 1

Which one of the following identifies the stages of growth of this animalcorrectly?

(D

(2)

(3)

(4)

stage 2 stage 3

pupa adult

larva adult

nymph pupa

nymph adult

7. The diagram belowshows the life cycle of animal X.

adult X

Based on the diagram above, which of the following statements do NOTdescribe animal X correctly?

A

B

C

It gives birth to its young alive.

It has threestages in its life cycle.

Its young closely resembles its parent.

(1) A and B only

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

(4) A, B and C

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8. The diagrams below show the different stages of growth (NOT in order),W, X, Y and Z, of a germinating seed.

W

Which one of the following shows the correct order of the stages of growth ofthe germinating seed?

(1) W^X-»Y-»Z

(3) Z -> W -» Y -» X

(2) X -» Y -* W -> Z

(4) Z -> Y -> W -» X

The diagrams on the left shows the vertical cross-section of a flower andthe right shows a female human reproductive system.

of the reproductive system ofPart R has a similar function as part oftthe plant.

(1) M (2) N

(3) O (4) P

Page 6 of 37

2011 P5 Science SA1

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10. The classification chart below is used to classify some living things.

living things

..... ^

P Q

Imushroom

bird's nest fern

chilli

watermelon

Which one of the following gives suitable sub-headings for P and Q?

(1)

(2)

(3)

(4)

p Q

flowering plants non-flowering plants

non-flowering plants flowering plants

reproduce by spores reproduce by seeds

reproduce by seeds reproduce by spores

Page 7 of 37

2011 P* ^^nce SA 1

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11. Fruit farmers sometimes use a method called marcotting to reproduce newplants.

As shown in thediagram below, a portion ofthe branch ofa parent plant is cutat the surface (stage 1).

Moist soil is wrapped around the area of the cut (stage 2).

After a few months, new roots will emerge from the cut area (stage 3).

The branch with its new roots will then be removed from the parent plant andgrown on its own.

stage 1 stage 2

Page 8 of 37

stage 3

roots

magnified view wrapped moist soil

magnified views of the stem

Which one of the following can be inferred from this reproduction method?

(1) The new plant will not have the same characteristics as its parent plant.

(2) Fruit farmers have to use this method because there is no other way bywhich the plant can reproduce.

(3) The new plant produces the same type of fruits since it inherited thegenetic information from its parent plant.

(4) The type ofthe fruit produced may notbe the same as the parent plantas genetic information may not be passed on from parent to itsyoung.

2011 P5 Science SA1

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12. The diagram below shows the seeds in the pod of plant K.

seed

Based on your observation of the pod above, what can be inferred aboutplant K?

(1) Plant K has large flowers.

(2) Plant K is a flowering plant.

(3) Plant K is a non-flowering plant.

(4) Each flower of plant K has an ovary with one ovule only.

13. Samy wanted to find out how overcrowding can affect the growth of seedlings.

He placed seeds of the same type in five pots of soil and placed them in asunny part of a garden. He watered the seeds with the same amount of water.After a few days, the seeds developed into seedlings.

garden soilA

sandy soilD

garden soilB

garden soilE

sandy soilC

Which two pots of seedlings should Samy observe to make a faircomparison?

(1) AandB

(3) B and D

(2)

(4)

Page 9 of 37

A and E

CandD

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14. The diagram below shows the labelled parts of flower X.

flower X

Which part(s) of flowerX is / are involved in pollination?

(1) A only

(3) B and fyonly(2) C only

(4) A, B and C

15. Bobby had two fruits, A and B, of the same type. He removed some parts offruit B as shown below.

A B

Bobby dropped both fruits, A and B, from the same height and recorded thetime taken for each fruit to reach the ground.

Which one of the following sets of readings is likely to be correct?

(1)

(2)

(3)

(4)

time taken for A

to reach the ground(sees)

time taken for B

to reach the ground(sees)

2.8 2.8

2.8 4.5

4.5 2.8

4.5 4.5

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16. The diagram below shows the processes, A, B, C and D, involved in the lifecycle of a flowering plant.

Which one of the following identifies the processes of germination, fertilisationand seed dispersal in the diagram correctly?

(1)

(2)

(3)

(4)

germination fertilisation seed dispersal

A C D

B A C

C D B

D B A

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n

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17. The flow chart below distinguishes some cells: W, X, Y and Z.

X Y

What one of the following identifies the types of cells correctly?

(D

(2)

(3)

(4)

w X Y Z

leaf cell root cell red blood cell cheek cell

cheek cell leaf cell red blood cell root cell

red blood cell leaf cell root cell cheek cell

red blood cell root cell cheek cell leaf cell

18. The diagram below shows a developing baby in the womb of a woman.

womb

developing baby

Which one of the following statements about the developing baby is NOTcorrect?

(1) He is formed from a fertilised ovary.

(2) He is made up of many different kinds of cells.

(3) He carries genetic information from both of his parents.

(4) He is formed when a sperm fuses with a female sex cell.

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19. The flow chart below differentiates different types of materials, P, Q, R, S andclay.

materials:

P, Q, R, S, clay

V

Does it break easily? no Is it flexible? no

i

yes

i

Is it transparent? no

* clay

yes

r

'

yes

r Is it waterproof? no

Syes

Based on the information above, which one of these materials, P, Q, R or S, isused to makethe foilowing objects?

(1) P

(3) R

(2) Q

(4) S

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2011 P5 Science SA1

\l

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20. The diagram below shows a bicycle with different parts labelled A, B and C.

A.

The table below shows three different materials X, Y and Z and theirproperties.

material properties

X flexible and stretchable

Y rust-proof and durable

Z soft and waterproof

Which one of the following shows the best material to be used foreach part ofthe bicycle?

(D

(2)

(3)

(4)

part A partB parte

X Y Z

Y X Z

Z X Y

Z Y X

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21. Esther had 3 objects, X, Y and Z (NOT drawn to scale).

First she put X in a measuring cylinder containing 30 cm3 of water. Next, sheput in Y, followed by Z.

The diagram below shows how the water level changed after each object wasput in.

water level (cm)

&J — \

SO-

"C-.

ec 4• |

&Q-r

30-

20-fi

•o-i

0 <

1

.. —

(x)

'

... '

.'•2-

'

Based on the information above, which of the following statement(s) is / aretrue about objects X, Y and / or Z?

A ObjectZ took up the least space inwater.

B Object Xtook up more space than object Y.

C Both objects Xand Ztook up less space than object Y.

(1)

(3)

A only

Conly

(2) B only

(4) A and C only

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2011 P5 Science SA1

«S>

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22. The diagram below shows a pump connected to a glass jar of 500 cm:The glass jar contains 40 cm3 of water.

piston

pump

glass jar500 cm3

When the piston is completely pushed in, 30 cm3 of air is forced into the glassjar.

What is the total volume of air in the jar now?

(1) 460 cm3

(3) 500 cm3

(2) 490 cm2

(4) 530 cm3

23. An electric kettle containing some water was found to weigh 1.6 kg on anelectronic balance as shown in the diagram below.

<r«£2* b*

EV/

I

f ^g 1

The kettle was switched on till the water in it boiled.5 minutes after boiling, the reading on the balance.

(1) remained as 1.6 kg

(2) was less than 1.6 kg

(3) was more than 1.6 kg

(4) was less than 1.6 kg before it increased to more than 1.6 kg

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24. The table below indicates the corresponding state which each of thesubstances, P, Q, R and S, exists in at various temperatures.

'^tQmperature

substance"\5°C 90° C 120° C

P liquid liquid gas

Q liquid gas gas

R solid liquid gas

S solid . gas gas

Which one of these substances, P, Q, R or S, is most likely pure water?

(D

(3)

P

R

(2) Q

(4) S

25. Freddy heated a beaker of ice continuously and recorded the changes in thetemperature of the contents inthe beaker over a period of time in the graphbelow.

Temperature (°C)

120..

100-

80-

60-

40-

20..

» I r I i t i i i i i t i t i i»

4 8 12 16 20 24 28 Time (min)

Based on the information above, which ofthe following could have possiblytaken place?

A Water did not gain heat between Q and R.

B Some tap water was added at 22nd minute.

C Water changed from its liquid state to solid state from R to S.

(1) A only (2) Bonly

(3) A and C only (4)

Page 17 of 37

B and C only

2011 P5 Science SA1

n

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26. Mabel had 4 tins of the same size and thickness, each made of a differentmaterial: A, B, C and D. The tins were filled with the same amount of waterand left in an open field on a sunny day at the same time.

Mabel plotted a graph below to show the changes of temperature of water ineach tin for twenty minutes at 4-minute intervals.

Temperature (°C)

I I I 1 I I t > t I I I t I I l»

4 8 12 16 20 24 28 Time(min)

Which one of these materials, A, B, C or D, would Mabel use to make a box toprevent ice cream from melting too quickly?

(1)

(3)

A

C

(2)

(4)

B

D

27. A piece of clear glass and an object were placed between a lighted torch anda screen as shown in the diagram below.

lighted torchI

clear glass object

A shadow was formed on the screen.

How could the shadow on the screen be enlarged?

(1) remove the clear glass

(2) move the object nearer to the screen

(3) move the object nearer to the clear glass

(4) move the torch further away from the clear glass

Page 18 of 37

screen

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28. Peter conducted an experiment to find out if the length of the shadow of thepole depends on the time of the day. He placed a wooden pole in the open ona sunny day. Next, he measured the length of the shadow of the pole at everyhour from 9 a.m. to 6 p.m.

Peter recorded his results in the following bar graph and showed it to hisclassmates.

IT3(0SIO)

«•—

o

c

19am 10am 11am 12pm 1pm 2pm 3pm 4pm 5pm 6pm

Time

Peter's classmates made the following conclusions.

Ahmad The longest shadow occurred at 5 pm.

Carolyn The shadow was shortest early in the morning.

Tilly The shadow was formed when the pole blocked light.David The shadow became longer after 1 pm.

Based on the information above, which of Peter'sclassmates made the correctconclusions?

(1) Ahmad and David only

(2) Carolyn and Tilly only

(3) Tilly and David only

(4) Ahmad, Carolyn and David only

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2011 P5 Science SA1

•1

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29. Identical beakers X and Y were each filled with a different amount of tapwater at 29° C. The beakers of water were heated till the water in bothbeakers boiled. Then they were left in the classroom for at least an hour.

beaker X beaker Y

water

V"""-

Which of the statement(s) below about both beakers of water is / are correct?

A At 90°C, both beakers of water contained the same amount ofheat.

B The time taken to heat both beakers of water to boiling pointwas different.

C The beakers of water were eventually cooled to roomtemperature.

(1) A only

(3) B and C only

(2) C only

(4) A, B and C

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30. Mrs Tan poured a packet of flavoured milk mixture at room temperature intothe inner steel can to make some ice cream using the apparatus as shownbelow.

flavoured mHkmixture

Inner steelcan

ice-cubes andsalt mbctere

plastic covering

Mrs Tan's children made the following statements:

Alison The inner steel transferred heat to the ice-cubes and saltmixture.

Belinda : The ice-cubes and salt mixture gained heat from theplastic covering.

Carmen : Heat travelled from the ice-cubes and salt mixture to theflavoured milk mixture in the inner steel can.

(1) Carmen only

(3) Belinda and Carmen only

(2) Alison and Belinda only

(4) Alison, Belinda and Carmen

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2011 P5 Science SA1

21

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Name: Index No: Class: P5

SECTION B (40 marks)

Forquestions 31 to 44, write your answers clearly in the spaces provided.

The number of marks is shown in brackets [ ] at the end of each question or part question.

31. The diagram below shows a flowering plant.

(a) What does part A of the plant develop into after pollination?

(b) State how useful part B is to the plant.

(c) Part C is removed from the plant.Explain what will happen to the plant after a few days.

Page 22 of 37

[1]

[1]

[1]

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32. The diagram below shows the different stages of growth in the life cycle ofan animal.

Stage X

Stage Y

Stage Z

Based on the diagram above, answer the following questions:

(a) Name the stages marked X and Y.

X: stage

Y: stage

(b) List two ways in which Stage X is different from Stage Z.

(Do NOT compare size and shape.)

Page 23 of 37

[1]

[2]

2011 P5 Science SA1

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33. An equal number of seeds of type X were put into identical glassbeakers, A and B, each with an equal amount of cotton wool.

The two beakers were placed in black boxes made of the same material (asshown in the diagrams below) near an open window.

"ligfTt light

black

boxes

seeds

dry cottonwool

seeds

damp cottonwool

Based on the information above, answer the following questions:

(a) In which of these beakers, Aand / or B, would the seeds most likely togerminate?

Explain your answer. [2]

(b) Which part of the seedling appeared first?[1]

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2011 P5 Science SA1*S

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34 The diagrams below (NOT drawn to scale) show fertilisation taking place indifferent reproductive systems.

pollen grain

partP

7f'f\v

stigma

partQ

stylemale sex cell

female sex cell

ovary

ovule

Based on the diagrams above, explain how parts P and Q enable fertilisation totake place in each of the reproductive systems: [2]

(i) P: :

(ii) Q:

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35. The flow chart shows how some animals are differentiated based on theirdifferent reproduction methods.

yesDoes the

young

resemble

the adult?

no

B

yes

t

C

Does the

young takeabout 9

months to

developbefore it is

born?

no

D

Based on the information above, classify each of the following animals.

Write letters A, B, C and D ONLY. [2]

human :

dolphin :

mosquito :

crocodile

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36. Sue Lynn observed and recorded the number ofwild plants, Xand Y, on apiece of land. After a few months, she examined the same piece of landagain.

Her observations are shown below.

/^ /Jr^ f

5m1 1

r^y

First observation

river

A Plant X

• Plant Y

After a few months

(a) State the methods of dispersal of fruits / seeds of plants X and Y andgive a reason for each ofyour answers: [2]

plantmethod(s) of

fruit / seed

dispersalreason

(b) Give an example of a plant with seeds of fruits which share the samemethod offruit dispersal as fruits of plant X. [1 ]

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37. Kate placed two leaves of similar size from the same plant into each of twoidentical test tubes containing liquid X.

After three hours, Kate observed the differences as shown below:

test tubes-

set-up A

liquid Xremained

colourless

tap water

leaves -

set-up B

(a) What caused colourless liquid X to turn green?

liquid X turnedgreen

very hotwater

[1]

To be continued on the next page

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2011 P5 Science SA1 2<=\

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Kate conducted ANOTHER experiment using set-up C.

Liquid X in set-up C, as shown below, remained colourless after three hours.

leaf

set-up C

very hotwater

liquid Xremained

colourless

Based on the results of Kate's experiments, answer the following questions:[2]

(b) (i) Identifythe set-up, A, B or C, in which chlorophyll was removedfrom the leaf.

(ii) Next, describe how chlorophyll could be removed from the leaf.Complete steps 2 and 3 in the table below.

stepdescription of procedure

1Put a green leaf into a test tube.

2

3

4

Place the test tube containing the green leaf andliquid X into the beaker of very hot water.

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38 The diagram below shows a car with some of its labelled parts.

material X

windscreen

(a) Suggest a suitable material to make the windscreen of a car.Give a reason why the material is used.

material reason

(b) Name ANOTHER object that is made of material X.

Page 30 of 37

[2]

[1]

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39. Jasmine was given a beaker of sand in salt solution. She used set-up A toseparate the sand from the salt solution.

The salt solution dripped into the bottle very slowly. Her teacher told her touse set-up B instead.

""""VTirrf

set-up A

retort

stands

clamp

filter

papers infunnels

.bottles

saltsolutions

clamp

=3

set-up B

(a) Explain why Jasmine's teacher asked her to use set-up B. [2]

(b) Suggest what Jasmine could do next to obtain salt from the saltsolution. [1]

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40. The statements A to F describe the events / processes (NOT arranged in thecorrect order) that lead to the formation of rain.

A ?

B Condensation takes place

C Droplets of water form clouds

D Warm air rises and then cools

F Water droplets become bigger to form rain

E Heat energy from the Sun warms the Earth

(a) Complete the diagram below to show the correct order in which rain isformed.

Write letters A, B, C, D and E in the appropriate circles.Letter F is written for you.

(b) Name the process that takes place at A.

Page 32 of 37

[1]

[1]

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41. Mavis filled 2 identical troughs with the same amount of red-coloured water.

Next, she placed the set-ups, A and B, in the garden on a hot day for 2 days.

plastic sheets

red -coloured

water

container X

set-up A

-troughs

container Y

set-up B

red -coloured

water

At the end of 2 days, Mavis observed that both containers X and Y were NOlonger empty. She found the same substance, P, in both containers.

(a) What was substance P?

Mavis measured the amount of substance P in each container, X and Y.

(b) Which container, X or Y, collected more of substance P?Explain your answer.

Page 33 of 37

[1]

[2]

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42. The opening of a glass syringe below was sealed. Air was trapped betweenthe piston and its sealed opening.

Joseph placed the sealed syringe in a beaker of hot water as shown below.

glass syringe

hot water-

^"^•Aa^r-^piston

trapped air

• sealed opening

•beaker

L—_— !

mm

What would Joseph observe of the piston when he placed the syringe in hotwater?

Explain your answer. [2]

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43. AH conducted an experiment to find out how the amount of light reflected byeach of these different materials, A, B and C, is affected by the distancebetween the light source and the material, d (cm).He set up his apparatus as shown in the diagram below.

light source

light(fixed position)

sensor

material

AH placed the light source at different distances from the material, one at atime, and used a light sensor to measure the amount of light each materialreflected.

He recorded his results and plotted the graph shown below.

amount

of lightreflected

(Lux)

distance between light source and material, d (cm)

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Based on the information on page 35, answer the following questions:

(a) Which material, A, B orC, was ableto reflect the most light at X? [1]

(b) Which material, A, B orC, could reflect light from the greatestdistance? [1]

(c) AH conducted his experiment in a completely dark room to ensure a fairtest. Explain why AH needed to do this. [1]

(d) State one OTHER variable that AH should keep constant to conducta fair test for his experiments. mi

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44. The following diagrams show an old method of keeping food warm.

Two identical metal hot pots were surrounded with dry grass. The dry grass incontainer P was loosely packed unlike the dry grass in container Q which waspacked closely together.

looselypacked dry

grass metal pots

wooden^containers

(a) The metal pot in container P was able to keep food warm for alonger period. Explain why.

closelypacked dry

grass

[2]

Using the same metal pot and lid, John used ANOTHER set-up to find out ifthe type of container will affect the rate in which the metal pot loses heat.

(b) List two variables which John must keep the same to carry out a fairtest. [2]

VARIABLE 1

VARIABLE 2

- END OF PAPER-

Setters: Mrs Christina Lim, Mdm Prisca Fernadez, Mr Ronald Lee

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RAFFLES GIRLS' PRIMARY SCHOOL

2011 PRIMARY 5 SCIENCE SA 1 ANSWER KEY

Setters : Mdm Prisca, Mr Ronald Lee & Mrs Christina LimCompiler: Mdm Prisca (Section A), MrsChristina Lim (Section B)

SECTION A (30 X 2 marks)

wpXJtes,

v/mz**

1.4

6.4

11.3

16.1

21.4

26.4

2.2

7.2

12.2

17.3

22.1

27.3

3.1

8.3

13.2

18.1

23.2

28.3

4.2

9.4

14.3

19.1

24.1

29.3

5.2

10.3

15.3

20.3

25.2

30.2

SECTION B (40 marks)

No. Marks Suggested answers Remarks

31

a 1 a fruit

b 1

Part B [contains chlorophyll which] helpsthe plant to

• trap light energy [Y2]to make food. [Yt]

or

• carry out photosynthesis. {1]

-P4] for wrong spelling- photosynthesis

c 1

[!4] Part C takes in water and• mineral salts

• nutrients

[1/4] without which the plant will wither anddie after a few days.

- [Yt] for any 1 of the 3conditions

-[1/2] for either "wither"or "die".

32

a 1

X: larval

Y: pupal

[0] for wrong spelling

-[Yt] max deduction forspelling without endingInT

b 2

• At stage Z, the animal has a pair offeelers while at stage X, it does nothave feelers.

• At stage Z, the animal has 3 bodyparts while at stage X, it has manybody segments.

• At stage Z, the animal has 2 pairsof wings while at stage X, it doesnot have wings.

Mark for any 2 correctanswers

[0] No comparision

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N o. Marks Suggested answers Remarks

33

a 2

Answer

seeds in B

Explanation

Seeds in A did not have water whileseeds in B had the three conditionsneeded for germination: water, air(oxygen) and warmth

Mark holistically

Explain how theconditions in A and B

affect seed

germination

b 1 root(s) [0] root hair

342

P enables the sperm to swim [Yt]

to [meet and ] fuse with/ reach the egg.

VA

• It leads the male sex cell to [meet and]fuse with/ reach the female sex cell [inthe ovule / ovary].

• It is a passage way/ tube for the malesex cell to reach the female sex cell.

[Y2] partial correctanswers

• enables/ allows

male sex cell to

move towards

female sex cell

35 2C, D, B, A [Y2] each correct

answer

36

a 2

X: by water

Reason

Fruits/ seeds of X were scattered alongthe

• side of the river

• near the water

• water body

Y : by wind / animals

Reason

Fruits/ seeds were

• scattered randomly [Vi]• dispersed everywhere

on the land P/zl.

NOTE

Question and diagram clearly shows thatseeds-are scattered on the land.

Mark holistically

[Y2] partial correctanswers

• follows the

direction of water

• name the river

wrongly e.g. sea,stream

• no mention of

'on the land'

[1] Award mark foreach correct method

of dispersal of fruit/seed and reason for

the answer

b 1

Any one of the following or possibleanswers:

• coconut

• pong pong

• nipah

[1] any plant withseeds/ fruitsdispersed by water-[Y2] for wrong spelling

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No. Marks

37

bi

bii

38

39

Suggested answers

[1] heat from the hot water

and/ or

chlorophyll [Yt]

B

step 2Pour liquid X into thetest tube.

step 3Pour very hot water intoa beaker.

Material:

glass

Reason:

It

• allows most light to pass throughit

• is transparentOR

The driver can see the objects clearly.container

gatenail

scissors

wheel of bicycleIn set-up B, air in the bottle could escapemore quickly [1]

so the salt solution could flow into thebottle more quickly [1].

Any other possible answer.• Heat the salt solution

• Boil the salt solution

• Put the salt solution under the sun

to evaporate the water, leaving the saltbehind.

Remarks

Do NOT accept:Chloroplasts

[Yt] partial correctanswer:

Chlorophyll

Jt was present In setup A but did not causeliquid X to turn green.Mark holistically

NO marks if set-up isidentified wrongly

[1] for each correctstepsteps 2 and 3 areinterchangeableMark holistically- [Yt] wrong spelling ofword in bold

[0] for missing mostlight

- [14] for all light topass through

No marks for statingthe material, (egmetal, iron, aluminiumetc)

Mark holisticallyNeed to show

comparison-[Y] for missing more(0) no mention of Setup B

-[14] wrong spellingevaporate

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No. Marks Suggested answers Remarks

40

a 1 E A D B C NO partial marks

b 1 evaporation

- [!4] wrong spellingDo NOT accept otherform of the word e.g.evaporate,evaporating

41

a 1

• pure water

• water

• clear water

[0] NOT acceptablewater droplets

b 2

Answer

X

Explanation

The exposed surface area of water in the trouahin set-up A was larger.[1]

Water in the trough could evaporate andcondense on the undersides of the plastic sheetmoreauickly. [1]

Mark holistically

[0]• set-up A• container X has a

larger exposedsurface area of

water than

container Y

42 2

Observation (no marks for observation)The piston

• moved up• raised up• went up

Explanation

The glass syringe gained heat from the hot water[%].So the trapped air gained heat from the syringe[Yt] and expanded [Yt],pushing/ raising/ moving the piston upwards. [Yt]

OR

The trapped air gained heat from the glasssyringe [%] which gained heat from the hot water

P4].Air in the syringe expanded [1/2], pushing / raising/moving the piston upwards. [1/2]

[V*The piston moved up. The trapped air gainedheat and expanded.(pupils did not link directly that it is the trappedair that caused the moving up)

[1]The piston moved up. The trapped air expanded[14] due to the heat gain hence pushing the pistonup[K].(the other 1 mark for transfer of heat from hotwater to glass syringe and transfer of heat fromglass syringe to trapped air)

Mark holisticallyObservation must be

correct before markingexplanation correct

[0]Once observation is

wrong/ incomplete, nomarks for explanation

The piston moveddownwards as the

glass syringe gainedheat from the hot water.

Key terms/ concepts• heat from hot water

• transfer to heat

• air expanded whenheated

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N<>. Marks

A

Suggested answers Remarks

a

b

1

1 C

To ensure that the light sensor only record/ [0]measure the reflected light from the material To prevent the light

sensor from detectingOther acceptable answers the surrounding light

If the room is not dark, light reflected which can affect All'scan also be light from other sources results

In the dark room, only the light fromthe source can be reflected

c 1 [0] NOT acceptedQuestion states that AH conducted the

experiment in a dark room, so it pupils write:• If the room is bright, he will not be able to

see the light.• If the room is not dark, sunlight could affect

the result

(During standardisation, it was decided that

43 not necessary only the sunlight affecting theresult but light from other light sources.)Any one of these variables: Do NOT accept:• the type of batteries used in the light The distance between

source the material and the

light source (based on• the angle of the light source the graph, it has to

vary)• the intensity of light from the light source

• the thickness of the material [0] NOT accepted• position of the torch

d 1 Other acceptable answers• type of light used• distance between the sensor and the light

source

• distance between the sensor and material• same torch

• size/ colour of the material

• light source has the same amount of light• position of the material from• same light sensor

• distance of the

torch

• the distance (pupilsdid not specifywhich distance)

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No. Marks

44

Suggested answers

More air [Yt] was trapped among the drygrass in set up Q.Air is a poor conductor of heat [Yt].So heat from the food in Q could not beconducted away as quickly as that in P [1].

VARIABLE 1

• thickness of the

container

• size of the container

VARIABLE 2• amount of dry grass» mass of dry grass

- END OF PAPER

Remarks

[0] No comparison

Mark holistically

[1] for each correctvariable

Do NOT accept:

• material of pot(given)

• size of lid

• material of lid

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