2012 percubaan pmr sains (kedah) - k2

7N

55/2 SCIENCE PMR Ogos 2012

PEPERIKSAAN PERCUBAAN PENILAIAN MENENGAH RENDAH 2012

SCIENCE KERTAS 2 PERATURAN PERMARKAHAN

UNTUK KEGUNAAN PEMERIKSA SAHAJA

___________________________________________________________________________ Peraturan pemarkahan pemarkahan ini mengandungi mengandungi 17 halaman bercetak 

1

No 1(a)

Mark Scheme

Mark 

Able to name the class of animal P, Q and R correctly Answer

P: Reptilia

Q: Amphibian

R: Mammals

* 3 correct = 2 marks * 2 correct = 1 mark  1(b)

2

Able to match with its characteristic correctly. Answer Animals  Haiwan

Characteristics Ciri-cirinya

P

Giving birth to live young.  Melahirkan anak 

Q

Laying eggs without shell.  Bertelur tidak bercengkerang.

1

R

Laying eggs with shell.  Bertelur bercengkerang

1

2

1

3

No 1(c)

Mark Scheme

Mark 

Able to choose animal which has the same class as animal R. Answer

√

1

1 TOTAL A1

3

6

No 2 (a)(i)

Mark Scheme

Mark 

Able to name the structure of L. Sample Answer 1. Valve 2. Bicuspid valve

1

1

1

1

1

1

1

1

Notes: If the name of the valve mention, only accept only bicuspid valve.

2(a)(ii)

Able to state the function of structure L. Sample Answer 1. To ensure that the flow of blood is in one direction. 2. To ensure blood flows in one direction from the left atrium to the left ventricle. Notes: If sample answer is chosen, only accept the direction from the left atrium to the left ventricle.

2(b)(i)

Able to name the part labelled T. Answer 1. Phloem

2(b)(ii)

Able to state the function of the the part labelled U. Sample Answer 1. Transport water and dissolved mineral salts. 2. Transport water and dissolved mineral salts from the root to the other part of the plant. 3. Helps to support the plants.

4

No 2(c)(i)

Mark Scheme

Mark 

Able to choose the person entitle to receive Sofea’s blood. Answer

Patient Pesakit 

Blood Group Kumpulan Darah

O

Emelda

AB

√

Emeriz

B

Erizmi

2(c)(ii)

1

1

1

1

Able to state the type of of blood which is called as universal universal donor donor Answer 1. Group O TOTAL A2

5

6

No 3(a)

Mark Scheme

Mark 

Able to label the position of pectorial girdle correctly. Answer Pectorial girdle  Lengkungan pelvis

3(b)(i)

1

1

1

1

1

1

1

1

2

2

Able to state the support system of the whale Answer Water buoyancy

3(b)(ii)

Able to give reason correctly Answer The whale has small endoskeleton that does not much support to its body weight.

3(c)

Able to state one common characteristic correctly. Answer Both animals have endoskeleton

3(d)

Able to explain why water vertebrates can grow much larger. Answer The skeleton of the animal does not have to support the whole weight of the animal because the upthrust of water does. TOTAL A3

6

6

No 4(a)

Mark Scheme

Mark 

Able to name the form of energy correctly. Answer 1. Chemical energy

4(b)(i)

1

1

1

1

1

1

1

1

Able to state the energy changes correctly Sample Answer 1. Changes from kinetic energy to electrical energy 2. Kinetic energy  electrical energy

4(b)(ii)

Able to state the advantage of the source of energy. energy. Sample Answer 1. Low cost or cheap cheap 2. Renewable 3. Can be used over and over again 4. Cannot be used up 5. Never run out 6. Can be replenish 7. Always available 8. Unlimited source 9. No pollution 10. Clean

4(c)(i)

Able to choose which coconut has a higher potential energy. Sample Answer 1. Coconut R 2. R

7

No

Mark Scheme

Mark 

4(c)(ii)

Able to explain how is the height of a coconut coconut tree influence the potential energy correctly. Sample Answer 1. The higher the coconut tree, the higher the potential energy. 2. The lower the coconut tree, the lower the potential energy. 3. As the height of the coconut tree increases, the potential energy increases. 4. As the height of the coconut tree decreases, the potential energy deceases. 5. The height of the coconut tree is direct proportional with the potential energy.

1

1

1

1

4(c)(iii) Able to explain why is coconut R produced produced louder sound when when it falls? Sample Answer 1. The coconut R tree is higher; it has a higher potential energy. These will make it has a higher energy. Because of these, it will make the sound become louder. 2. The coconut tree is higher; it has a higher potential energy and when it changes to kinetic energy, the kinetic energy also higher compared to S. Because of these, it will make the sound become louder. louder. 3. Because it has a higher potential energy. 4. Because it has a higher kinetic ki netic energy. TOTAL A4

8

6

No 5(a)(i)

Mark Scheme

Mark 

Able to complete the sequence correctly. Sample Answer Lungs

5(a)(ii)

R

Q

P

1

1

1

1

Able to give one characteristic correctly. Sample Answer 1. Thin wall (one cell thick) 2. Lined by a thin layer of moisture 3. Surrounded by large network of blood capillaries

5(b)(i)

Able to state the condition correctly. Answer

Structure of model Struktur model Volume in the glass glass jar  Isipadu di dalam balang kaca kaca Pressure in the glass jar Takanan di dalam balang kaca

 X

Y 

increase

decrease

decrease

increase

1

1

All correct - 2 marks 2-3 correct - 1 mark  1 correct - 0 mark  5(c)(i)

2

Able to state one problem correctly. Sample Answer 1. 2. 3. 4.

Can have emphysema Heart diseases Bronchitis Lung cancer

1

9

1

No 5(c)(ii)

Mark Scheme

Mark 

Able to give a reason correctly. Sample Answer In the cigarette contain nicotine that makes a smoker addicted to it.

5(d)(i)

1

1

1

1

1

1

Able to state the effect correctly. Sample Answer 1. Can cause breathing difficulties 2. Damage lung tissues

5(d)(ii)

Able to suggest the way to reduce reduce pollutant correctly. Sample Answer 1. Use unleaded fuel 2. Industries should install filters on smokestacks smokestacks 3. Car-pool practising TOTAL A5

10

8

No 6(a)(i)

Mark Scheme

Mark 

Able to state the uses of lime water. Sample Answer to check for the presence of carbon dioxide

6(a)(ii)

1

1

1

1

Able to state the result of the observation. Sample Answer limewater turns cloudy cloudy // chalky.

6(a)(iii) Able to complete complete the words words equation equation from the reaction. Answer

Calcium carbonate

heated

calcium oxide

carbon +

dioxide 1

1

All correct - 2 marks 1 correct - 0 mark 

6(a)(iv)

2

Able to state the element correctly. Sample Answer calcium, carbon and oxygen

1

11

1

No 6(b)(i)

Mark Scheme

Mark 

Able to name the product formed. Sample Answer calcium hydroxide // slaked lime

6(b)(ii)

1

1

1

1

1

1

1

1 8

Able to state the uses of the product. Sample Answer Slaked lime is added added to the soil to reduce reduce the acidity of the soil.

6(b)(iii) Able to give a reason. Answer Slaked lime is alkali.

6(c)

Able to state changes of the colour of red litmus paper. Sample Answer ERed litmus paper turns blue.

TOTAL A6

12

No 7(a)(i)

Mark Scheme

Mark 

Able to state the observation. Sample Answer P : Float on water//Timbul (terapung)di permukaan permukaan air

1

Q: Sink in water//Tenggelam dalam air

1

* P berada di atas air

SALAH

Q berada di bawah air

7(a)(ii)

2

Able to classify the object. Sample Answer Less dense than water : Object P

1

Denser than water

1

: Object Object Q, R

2 7(a)(iii) Able to give an inference. Answer Inference :

1. P floats on water 2. Q sink in water

7(a) ( iv)

because

because

it less dense than water.

Or

it denser than water.

1

1

1

1

Able to state the relationship. Sample Answer If the density of object is higher than density of water, it will be sink in water. or

If the density of object is lower than density of water, i t will be float on water.

13

No 7(b)

Mark Scheme

Mark 

Able to state the prediction. Sample Answer Cork : Float / Timbul

1

Wood : Sink / Tenggelam Tenggelam

1 TOTAL B7

No 8(a)(i)

Mark Scheme

2 8

Mark 

Able to state the difference by observing the diagram. Sample Answer Teapot M is black, Teapot N is white. // Teapot M is darker than Teapot N.

8(a)(ii)

1

1

1

1

1

1

Able to state state the result from observing observing the situation situation in the diagram. diagram. Sample Answer Coffee in Teapot M. // In Teapot M. // Teapot M. // M

8(a)(iii) Able to state a reason. Sample Answer The dark surface radiates heat better than the white surface.

14

No 8(b)(i)

Mark Scheme

Mark 

Able to read read the the reading reading of the stop stop watch watch and and record record the the reading. reading. Sample Answer

eperatre of ater   C) Suhu air    C)

Conical flasks Kelalang kon

0 minute

10 minutes

20 minutes

30 minutes

0 minit 

10 minit 

20 minit 

30 minit 

P

85

75

65

55

Q

85

79

73

67

No 8(c)

Mark Scheme

1

1

Mark 

Able to state the hypothesis correctly. Sample Answer The darker the colour of surface, the lower the temperature of water. /// if the colour of the surface is darker, the temperature of water decreases / lower. //  The temperature of water lower / decreases when the colour of surface is darker.

8(d)

1

1

Able to state the variable involved in the experiment. Sample Answer

Manipulated variable

Colour of the surface / type of the surface

Pembolehubah dimanipulasi

Responding variable

1 The temperature of water

Pembolehubah bergerak balas

1

15

2

No 8(e)(i)

Mark Scheme

Mark 

Able to draw a graph using the data in the table. Sample Answer

eperatre of ater  )

90

80

70

1 60

1 50

40

30

20

10

2

0 10

20

30 Time ( min )

16

No

Mark Scheme

Mark 

8(e)(ii)

Able to state the relationship between the type of surface and the temperature temperature of water. Sample Answer 1. The temperature of water is lower when the colour of surface is dull and dark but the temperature is higher when the colour of surface is white and shiny. 2. The darker the surface, the lower the temperature of water.

1

1

1

1

1

1

8(e)(iii) Able to make a prediction Sample Answer o

Less than 45 C

8(f)

Able to define operationally the ‘heat release’ Sample answer 1. Heat release is shown by the decreasing of the temperature of water in conical flask. 2. Heat release is shown when the temperature of water in conical flask  is lower. 3. Heat release is the temperature of water TOTAL B8 JUMLAH

17

12 60