2008 Kedah Spm Science_ans

Sains Kertas 1 & 2 Peraturan Pemarkahan PERSIDANGAN KEBANGSAAN PENGETUA-PENGETUA SEKOLAH MENENGAH NEGERI KEDAH DARUL AMAN PEPERIKSAAN PERCUBAAN SPM 2008

SAINS Kertas 1 & 2 PERATURAN PEMARKAHAN UNTUK KEGUNAAN PEMERIKSA SAHAJA AMARAN Peraturan pemarkahan ini SULIT dan Hak Cipta Jabatan Pelajaran Negeri Kedah. Kegunaan khusus untuk pemeriksa yang berkenaan sahaja. Sebarang maklumat dalam peraturan pemarkahan ini tidak boleh dimaklumkan kepada sesiapa. Peraturan pemarkahan ini tidak boleh dikeluarkan dalam apa jua bentuk penulisan dan percetakan.

Peraturan pemarkahan ini mengandungi 11 halaman bercetak

2 1511/2(PP) MARKING SCHEME ( PAPER 1 )

QUESTION NO

ANSWER

QUESTION NO

ANSWER

1

A

26

A

2

C

27

A

3

A

28

B

4

D

29

D

5

C

30

A

6

B

31

A

7

C

32

C

8

C

33

A

9

B

34

A

10

B

35

D

11

D

36

C

12

B

37

B

13

C

38

C

14

C

39

B

15

A

40

D

16

D

41

D

17

C

42

D

18

D

43

B

19

B

44

B

20

C

45

A

21

C

46

D

22

A

47

D

23

B

48

C

24

C

49

C

25

D

50

A

______________________________________________________________________________________ Marking scheme science SPM Trial Exam 2008

3 MARKING SCHEME ( PAPER 2 ) Quest No

Marking Criteria

Mark

Σ Marks

1

1

SECTION A 1

(a) 1. Iron rod/metal can light up bulb and sulphur rod/non-metal does not light up bulb 2. Metal can conduct electricity and/while/whereas non-metal does not conduct electricity (b) (i) Type of substance / rod

(ii)

1

1. Condition of bulb 2. Electrical conductivity of substance/rod

(c) 1. Metal is a substance that can light up a bulb 2. Metal is a substance that causes the bulb to light up. (d) Copper rod Plastic rod Lead rod Glass rod Note: Both must correct

√

1

2

1

1

1

1

TOTAL 1

5 1

1

1

1

1

1

1

1

1

TOTAL

5

√

(a) 18 (0C) (b) (i) 1. Thermometer reading in Diagram 2.1 is bigger/higher than Diagram 2.2. 2. Thermometer reading in Diagram 2.2 is smaller/ lower than in Diagram 2.1 Note: Different reading is not accepted

2

(b) (ii) 1. Heat is absorbed when ammonium chloride is added into distilled water 2. Heat is released when sodium hydroxide is added into distilled water (c) Initial temperature of distilled water Note: Not accepted Does not 1. volume of distilled water influence the 2. type of water result of exp. 3. quantity / mass of substance

}

(d) Endothermic reaction is a reaction that shows the decreasing of thermometer reading

______________________________________________________________________________________ Marking scheme science SPM Trial Exam 2008

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Quest. No

Marking Criteria

Mark

Σ Marks

2

2

1

1

1

1

1

1

TOTAL 1

5

1

2

(a)

28

3

Note: 1. All 5 points are transferred correctly – 1 mark 2. The smoothness of the graph - 1 mark (b) The answer must be shown by dotted line/ line on the graph (c)

31 + 1 (cm3)

(d) 1. As the time increases, the volume of gas (collected) increases. 2. The longer the time, the higher the volume of gas (collected) 4

(a) (i) 1. Depth of dent (formed on the plasticine) in Diagram 4.2 is deeper than in Diagram 4.1. 2. Depth of dent in Diagram 4.1 is shallower/ less deep than in Diagram 4.2 (ii) 1.0 + 0.1 ( cm ) (b) (i) mass of trolley (ii) Velocity of trolley (c) 1. The bigger the mass of the trolley, the bigger the momentum produced 2. The bigger the mass of the trolley, the deeper the dent formed on the plasticine.

1 1

2

1

1

TOTAL

5

______________________________________________________________________________________ Marking scheme science SPM Trial Exam 2008

5 Quest No

Marking Criteria

Mark

Σ Marks

SECTION B (a) L : Cerebrum K : Cerebellum

(b) Control body balance (and posture)

1 1

2

1

1

1

1

(c) 5

Cycling Reading berbasikal Membaca √ Note: Both must correct (d) (i)

Menari Dancing √

Reflex action

(ii) Prevent/avoid body from injury

1 1

2

TOTAL 1

6

1

2

1

1

1

1

(d) real // inverted // (size) smaller than object

1

1

(e)

1

1

TOTAL 1

6

1

2

(a) (i)

Diaphragm

(ii) 1. To control the amount of light entering the camera 2. To control the size of aperture (b) iris 6 (c)

7

The lens is adjusted nearer/closer to the film.

To ensure that light is not reflected (out from the camera)

(a) (i) Stage R : Egg (ii) Stage T: Pupa

(b) 1. Cleaning drains/ swamp/ pond/any containers

1

2. Draining drains/ swamp/ pond/ any containers

(c) (i) Malaria // dengue ( fever) (ii) Anopheles // Aedes Note: Anopheles if malaria and Aedes if dengue fever (iii) When an infected dengue patient is bitten by a mosquito, the pathogens in the saliva of the mosquito enter the bloodstream of a healthy person.

1 1 1

1

3

TOTAL

6

______________________________________________________________________________________ Marking scheme science SPM Trial Exam 2008

6 Quest No

Mark

Σ Marks

1

1

2

2

1

1

1

1

1

1

TOTAL 1

6

(a) P : Thermoplastic Q : Thermoset

1

2

1

1

Marking Criteria (a) Carbon dioxide (b) 1. burning/combustion 2. respiration 3. decomposition Any two (c)

8

Green house effect// Global warming

(d) 1. rise of sea level 2. coastal flooding 3. floods 4. drought 5. hurricanes 6. typhoons 7. change in weather Any one (e) Replanting Penanaman semula Building dam Membina empangan Car pool Perkongsian kereta





(b) (As) food container/plastic bags/toys/bottles Any one (c)(i)

1

9

 1

______________________________________________________________________________________ Marking scheme science SPM Trial Exam 2008

7

(ii) 1. Bowls 2. Plates 3. Kitchenware 4. Adhesives Any one

Quest No

Marking Criteria (iii) 1. Hard 2. Does not burn easily 3. Heat resistance 4. Cannot be remoulded/recycle Any one

10

(a)

Hypothesis : 1. The larger the mass of an object, the greater the inertia of the object 2. The larger the mass of an object, the harder/more difficult the object to stop moving 3. The pail with sand is hard/difficult to stop moving 4. The empty pail is easy to stop moving

(b) (i) Aim : To study the relationship between mass and inertia of an object (ii) Manipulated variable : mass of the object Responding variable : inertia//time taken to stop the pail//difficulty to stop the pail Constant variable : length of the string // size of plastic pail//the force applied on the plastic pail/ to move the plastic pails.

Mark

Σ Marks

1

3

TOTAL

6

1

1

1

1

1 1 1

max 2

1

1

(iii) Apparatus and materials : sand, two plastic pails ,string , stopwatch and wood (to hang the plastic pails) 1 (iv) Procedure: 1. Two plastic pails A and B are hung using string.// diagram – pt 1 2. Plastic pail A is filled with sand and plastic pail B is left empty.// diagram – pt 2 3. A force is used to swing the plastic pail A and B together at the same height and speed.-pt 3 4. Observation is made to determine which plastic pail needs a longer time to stop moving.-pt 4

1

4

1 1

1

1

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[v] Tabulation of data. Mass of plastic pail / object

Inertia// Difficulty to stop the plastic pail//Time taken to stop the plastic pail from

A B Note: If time taken is to be observed stop watch must be stated in apparatus and material TOTAL

10

______________________________________________________________________________________ Marking scheme science SPM Trial Exam 2008

9

Quest No 11(a)

Marking Criteria Food Additives Preservatives

• • •

Mark

Effects Disturb the human digestive system Destroy vitamin B in drinks Cause rashes

Σ Marks

2

•

Colouring

Bleach Flavouring

Sweetener

Anti-oxidants

Foetal abnormality in the womb • Swelling of certain soft tissues such as eyelids, lips, tongue and hands • Tightness in the chest for individuals suffering from asthma • Cause cancer • Cause infertility • Cause food poisoning • Cause cancer • Cause food poisoning • Cause cancer • Brain damage especially in children • Tightness in the chest for individuals suffering from asthma • Cause cancer • Cause rashes • Cause hives • Stunt body growth • Damage the liver and kidneys • Cause rashes • Cause hives • Tightness in the chest for Individuals suffering from asthma

2 2 2

2

2

Note:

• •

One food additives and their effect – 2 marks Any two additives and their effect

- 4 marks

4

______________________________________________________________________________________ Marking scheme science SPM Trial Exam 2008

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Quest No 11(b)

Marking Criteria Problem : To increase the quality and quantity of food production because the population of Malaysian is increasing. Methods : 1. Use of quality breeds • Produce high quality yields • Breeds matured earlier • The breeds which are being developed is more resistant/tolerant to drought, diseases and pests 2. Use of modern technology • The use of modern machines such as tractors, mechanical harvesters and power tillers speed up the planting and harvesting of crops. • Can increase the efficiency of labour, water, plant nutrients and invested capital used 3. Education and guidance for farmers • Farmers should be educated on how to use quality breeds and modern technology (to increase the yields of their crops). 4. Research and development • Agencies and government institutions (FAMA,MARDI,MPOB and UPM) conducting research and development activities, provide training and education related to agriculture, livestock and fisheries. 5. Efficient land management • Proper management of agricultural land is necessary which ensuring the land remains fertile and to prevent soil erosion 6. Optimum uses of land and irrigated areas • Integrated systems involve rearing livestock and planting crops on the same farmland 7. Genetically modified food • Food is produced from a genetically modified organism. • Food produced is altered to produce desirable qualities such as resistance to pest or inclement weather Note: Any two methods and explanation – 4 marks

Mark 1

Σ Marks 1

2

2

2

2

2

2

2

4

______________________________________________________________________________________ Marking scheme science SPM Trial Exam 2008

11

Best method and explanation Example answer: Optimum use of land and irrigated areas This type of method can increase the quality and quantity of food production

Quest No 12(a)

1

1

TOTAL

10

Marking Criteria

Mark

Σ Marks

i. Arteriosclerosis: Caused by cholesterol accumulating on the inner walls of arteries that reduces the lumen of the arteries.

2

ii. High blood pressure: Occurs when blood is pumped through the narrow blood arteries at a higher pressure causing high blood pressure. iii. Thrombosis: Caused by a blood clot which blocks an artery completely

2 2

iv. Stroke: A thrombosis in the blood vessels of the brain It occurs when the blood supply to a part of the brain is blocked by a blood clot in a blood vessel of the brain

2

v. Heart attack: Occurs when a blood vessel that supplies blood to a part of the heart becomes blocked.

2

vi. Heart disease: Caused by arteriosclerosis

2

vii. Diabetes: A condition in which the body cannot control the sugar level in the blood Note:

2

4

1. One disease and explanation - 2 marks 2. Choose any two diseases and explanation

______________________________________________________________________________________ Marking scheme science SPM Trial Exam 2008

12

Quest No 12(b)

Marking Criteria i. Common characteristics 1. Important element for plants to grow well. 2. Nutrients which are needed by plants in large quantity. 3. Lack/deficiency of nutrients caused stunted or retarded growth in plants Note : Any two common characteristic ii. Initial concept: Important elements which are needed by plants in large quantity are macronutrient iii. Other example of macronutrient: 1. carbon 2. oxygen 3. hydrogen 4. oxygen 5. magnesium 6. sulphur Any one iv. Non-example of macronutrient 1. boron 2. molybdenum 3. zinc 4. manganese 5. copper 6. iron Any one

Mark

Σ Marks

2

1

1

6 1

1

v. Actual concept: Macronutrients are important elements which are needed by plants in large quantity. TOTAL

10

END OF MARKING SCHEME SKEMA PEMARKAHAN TAMAT ______________________________________________________________________________________ Marking scheme science SPM Trial Exam 2008

13

______________________________________________________________________________________ Marking scheme science SPM Trial Exam 2008