2009 Percubaan Pmr Sains(sbp)-k2-qa

SULIT NAMA PELAJAR

TINGKATAN

BAHAGIAN PENGURUSAN SEKOLAH BERASRAMA PENUH DAN SEKOLAH KLUSTER KEMENTERIAN PELAJARAN MALAYSIA

PEPERIKSAAN PERCUBAAN PMR 2009 TINGKATAN 3

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SCIENCE Kertas 2 Ogos 1 ½ jam

Satu jam tiga puluh minit

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU Untuk Kegunaan Pemeriksa

1. Tulis nama penuh dan tingkatan anda pada ruangan yang disediakan.

2. Kertas soalan ini adalah dalam Bahasa Inggeris.

Kod Pemeriksa: Bahagian

Soalan 1

3. Calon dikehendaki membaca maklumat di halaman belakang kertas soalan ini.

A

B

Markah Markah Penuh Diperoleh 6

2

6

3

6

4

6

5

8

6

8

7

10

8

10

JUMLAH

60

Kertas soalan ini mengandungi 19 halaman bercetak 55/2

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Section A [40 marks] Answer all questions. 1

Diagram 1 shows three instruments, J, K and L which are commonly used in the laboratory.

J:

K:

L: Diagram 1

(a)

(i)

On Diagram 1, label the apparatus, J, K and L using the following words: Measuring cylinder

Evaporating dish

Filter funnel [ 3 marks ]

(ii) Based on your answer in (a) (i), which of the instruments is used to measure the volume of a liquid? ............................................................................................................................. [1 mark] (b)

Draw lines to match the instruments with their respective functions. Instrumets

Function 

To support apparatus during heating



To measure temperature



To conduct the excess heat away



To measure time [2 marks]

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SULIT 2

3

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Diagram 2.1 shows the classification of nutritious food in a Food Pyramid.

X

Diagram 2.1 (a) State the importance of using a food pyramid. ........................................................................................................................................... [1 mark] (b) (i)

What is the function of food class X? .............................................................................................................................. [1 mark]

(ii) What happens if an individual lacks class food X in his daily diet? .............................................................................................................................. [1 mark] (c)

Diagram 2.2 shows a person suffering from a kind of disease.

Diagram 2.2 Which class of food will cause the disease in Diagram 2.2 if taken excessively in our daily diet? ..................................................................................................................................... [1 mark]

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SULIT

4

(d) (i)

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A student was given few food samples by his teacher. How can he test the presence of carbohydrates in the food sample? ........................................................................................................................... [1 mark]

(ii)

State the end product of digestion of carbohydrates in the small intestine? ........................................................................................................................... [1 mark]

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SULIT 3

5

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Diagram 3.1 shows a food chain in the oil palm estate.

Oil palm tree

Mouse

Owl

Diagram 3.1 (a) (i)

What is the main energy source for this food chain? ............................................................................................................................. [1 mark]

(ii)

Write down the energy changes when the oil palm leaf absorbs sunlight during photosynthesis. ............................................................................................................................ [1 mark]

(b) (i)

Owls are used to control the mouse population in the oil palm estate. State the method used. ............................................................................................................................ [1 mark]

(ii)

State one advantage of the method you mentioned in (b)(i). ............................................................................................................................ [1 mark]

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(d) Diagram 3.2 shows a pyramid of numbers.

Diagram 3.2 Complete the pyramid of numbers to represent the food chain in Diagram 3.1. [1 mark] (e)

If all owls migrate to another place, state another organism that can be introduced to control the mouse population in this oil palm estate. ..................................................................................................................................... [1 mark]

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SULIT 4

7

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Diagram 4 shows an appliance that uses the principle of air pressure.

Diagram 4 (a) (i)

Name the apparatus in Diagram 4. ........................................................................................................................... [1 mark]

(ii)

State the use of the apparatus. ........................................................................................................................... ........................................................................................................................... [1 mark]

(b) On Diagram 4, mark the symbols:

HP

for high pressure

LP

for low pressure [2 marks]

(c)

Can the apparatus function properly if the rubber tube is not filled with water? Explain. ……………………………………………………………………………………..... ………………………………………………………………………………………. [2 marks]

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SULIT 5

8

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Diagram 5.1 shows an experiment conducted on a balsam plant.

Diagram 5.1 (a)

(i)

What happens if a fresh balsam plant is left in beaker R for two hours? ............................................................................................................................... [1 mark]

(ii)

Predict what will happen to the balsam plant if water is poured into beaker R? ............................................................................................................................... [1 mark]

(iii)

What can you infer from your observation in (a) (ii) above? ............................................................................................................................... [1 mark]

(iv)

State the support system in a balsam plant? ............................................................................................................................... [1 mark]

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SULIT (b)

9 (i)

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Diagram 5.2 shows the same aquatic plant in two different situations.

Situation A

Situation B Diagram 5.2

State your observation in situation A and situation B ? ............................................................................................................................... [1 mark] (ii)

What is the inference for your observation in (b)(i) above? ............................................................................................................................... [1 mark]

(iii)

What makes the aquatic plant in situation B stand upright? ............................................................................................................................... [1 mark]

(c)

What is the function of the support system in both plants in this experiment? .......................................................................................................................................... [1 mark]

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SULIT 6

10

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Diagram 6 shows the set-up apparatus to determine the action of heat on plumbum sulphide.

Diagram 6 (a) (i)

Describe the colour change of the acidified potassium manganate (VII) solution. ........................................................................................................................... [1 mark]

(ii)

Name the solution that can be used to substitute the acidified potassium manganate (VII) solution. ......................................................................................................................... [1 mark]

(iii)

Name the white residue produced after plumbum sulphide is heated. ........................................................................................................................... [1 mark ]

(b) State the two elements found in plumbum sulphide. (i) ........................................................................................................ (ii) ......................................................................................................... [2 marks]

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SULIT (c)

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Write the word equation for the reaction of heat on plumbum sulphide. heat + Oxygen

+

[2 marks] (d) Give one example of a chemical compound that can replace plumbum sulphide in this experiment. ..................................................................................................................................... [1 mark]

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Section B [20 marks] Answer all questions. 7

(a)

Diagram 7.1 shows four organisms, P, Q, R and S that reproduce in different ways.

P

Q

S

R Diagram 7.1

State one characteristic that can be observed from any three organisms by referring to their way of reproduction. Organisms

Way of Reproduction

.........................................................................................

.........................................................................................

......................................................................................... [3 marks]

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SULIT (b)

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Classify the organisms, P, Q, R and S into groups based on their common characteristics.

P, Q, R and S

Common characteristics

Name of organisms

[4 marks]

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SULIT (c)

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Diagram 7.2 shows three conditions, J, K and L, for germination of seeds.

J

K

L

Diagram 7.2 Based on Diagram 7.2: (i) State one inference about the condition required for germination of seeds. ……………………………………………………………………………… ……………………………………………………………………………… [1 mark] (ii)

Predict which condition is the most suitable for the seeds to germinate. ……………………………………………………………………………… [1 mark]

(iii)

State the relationship between the presence of water and air with the germination of seeds. ……………………………………………………………………………… ……………………………………………………………………………… [1 mark]

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SULIT 8 .

(a)

15

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Diagram 8.1 shows two circuits P and Q that have different numbers of bulbs.

P

Q Diagram 8.1

The brightness of bulbs in two circuits is observed. State one inference about the brightness of the bulbs. ……………………………………………………………………………………... [1 mark] (b)

Diagram 8.2 shows an electrical circuit set up to study the relationship between the length of nichrome wire and current flow. Dry cells Bulb Ammeter Crocodile clip Metre ruler Nichrome wire

Diagram 8.2 The steps of the experiment are as follows: 1. The crocodile clip is touched on the nichrome wire at the length of 10 cm. 2. The ammeter reading is recorded. 3. Step 1 and step 2 are repeated by increasing the length of nicrome wire at 20 cm, 30 cm and 40 cm respectively. The results are shown in Table 8.3. Length of nichrome wire (cm)

Ammeter reading (A)

10

0.85

20

0.80

30

0.75

40 Table 8.3

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Diagram 8.4 shows the ammeter reading when the length of nichrome wire is 40 cm.

Diagram 8.4 Based on Table 8.3 and Diagram 8.4:

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(i)

Record the ammeter reading for 40 cm length of wire used in Table 8.3. [1 mark]

(ii)

Use the graph paper provided on page 17 to answer this part of the question. Based on the readings in Table 8.3, plot a graph to show the relatioship between the length of nichrome wire against current flow. [2 marks]

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Graph for Question 8(b)(ii)

0.8

Current (A)

0.6

0.4

0.2

10

20

30

40

50

Length of nichrome wire (cm)

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SULIT (iii)

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Based on the graph drawn in 8(b)(ii), state the relationship between the length of nichrome wire and current. .................................................................................................................................... .................................................................................................................................... [1 mark]

(iv)

State the manipulated variable involved in this experiment. .................................................................................................................................... [1 mark]

(v)

Predict the ammeter reading if 50 cm nichrome wire is used in the circuit. .................................................................................................................................... [1 mark]

(vi)

Define operationally “the current”. ………………………………………………………………………………..…..… [1 mark]

(vii)

In the box provided draw a circuit diagram to show a parallel circuit by using the symbols for the following components.

[2 marks] END OF QUESTION PAPER 55/2

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INFORMATION FOR CANDIDATES

1. This question paper consist of two sections: Section A and Section B. 2. Answer all questions in both sections. 3. Write your answers in the spaces provided in the question paper. 4. Show your working, it may help you to get marks. 5. If you wish to change your answer, neatly cross out the answer that you have done. Then write down the new answer. 6. The diagrams in the questions provided are not drawn to scale unless stated. 7. Marks allocated for each question or sub-part of a question are shown in brackets. 8. The time suggested to complete Section A is 60 minutes and Section B is 30 minutes. 9. You may use a non-programmable scientific calculator. 10. Hand in this question paper to the invigilator at the end of the examination.

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BAHAGIAN PENGURUSAN SEKOLAH BERASRAMA PENUH DAN SEKOLAH KLUSTER KEMENTERIAN PELAJARAN MALAYSIA

PEPERIKSAAN PERCUBAAN PMR 2009

SKEMA PEMARKAHAN

SAINS (KERTAS 1 & KERTAS 2) 55/1 & 55/2

SKEMA JAWAPAN KERTAS 2 QUESTIONS 1

(a)

(i)

(ii)

RUBRIC

MARKS

J : Filter funnel K: Measuring cylinder L : Evaporating dish * Spelling must be correct

1 1 1

Measuring cylinder / K

1

(b)



To support apparatus during heating



To measure temperature



To conduct the excess heat away



To measure time

3 1

1

2

1

TOTAL 2

(a) (b)

(i)

(ii) (c) (d)

(i)

(ii)

6

Help people to plan a (healthy) balance diet

1

- (Needed) for growth // - Repair body tissues // -(Required) for the formation of enzymes/ hormones/ antibodies/ haemoglobin Any suitable answer

1

Kwashiorkor * Spelling must be correct

1

Fat // Carbohydrate

1

- Drop iodine solution on the food sample, it will turn to blue black/ dark blue// - Turns iodine solution to blue black/ dark blue

1

Glucose

1

2

(a)

(b)

6

(i)

Sunlight

1

(ii)

Light energy changes to chemicals energy / light energy chemical energy

1

(i)

Biological control

1

(ii)

- Does not pollute air (environment) // - Does not kill other organisms except pests // - Cheap / affordable

1

*Accept any suitable answer

1 2

TOTAL 3

1

1 1 1

1

(c)

(i)

1 Owl Mouse

1

Oil palm tree

(ii)

Snakes / Cats *Accept any suitable answer.

1 TOTAL

4

1 6

(a)

Siphon

1

1

(b)

To transfer water (liquid) from a high level to a lower level

1

1

(c)

2

2

(d)

No. - The air pressure in the rubber tube will prevent the water from flowing // - The air pressure in the rubber tube is the same as the atmospheric pressure

1 1 2

TOTAL 5

(a)

(i)

It will wilt / droop / unable to remain firm / unable to stay upright

1

(ii)

It will be firm and remain/ stay upright / look fresh/ not droop

1

(iii)

-

1

-

(b)

6

Balsam plant needs water to stand upright // Turgidity of the balsam plant depends on the presence of water The balsam plant can stay upright because there is support by turgidity of water

3

(iv)

The turgidity of cells / cell turgidity

1

1

(i)

In situation A aquatic plant cannot stand upright on its own whereas in situation B the aquatic plant stand upright

1

3

(ii)

-

1

Aquatic plant needs water in order to stand upright The aquatic plant can stand upright because there is support from water (buoyancy)

(iii) (c)

Buoyant force of water / buoyancy of water

1

To support its/ the plants body weight

1 TOTAL

6

(a)

(b)

Purple to/  colourless/ The purple colour of acidified potassium manganate (VII) solution is bleached

1

(ii)

Acidified potassium dichromate (VI) solution

1

(iii)

Plumbum oxide

1

(i) (ii)

Plumbum Sulphur

1 1 heat

Plumbum sulphide + Oxygen

(d)

8

(i)

(c)

3

(a)

2

2 Plumbum oxide + sulphur dioxide

2

All 3 answers are correct – 2 marks Any 2 answers are correct – 1 mark

Zinc sulphide (Blende) // Magnesium sulphide // Iron Sulphide (Pyrite) // Copper sulphide (Chalcocite) *Accept any suitable answer.

1 1

TOTAL 7

1

Organism Amoeba Frog Housefly Starfish

Way of Reproduction Asexual (reproduction) // Binary fission Sexual (reproduction) Sexual (reproduction) Asexual (reproduction) // Regeneration

*Accept any 3 correct answers

8 1 1 1 1

3

(b) P, Q, R and S

Sexual reproduction / Reproduce sexually //

Asexual reproduction/ Not reproduce Common characteristics sexually/ Reproduce asexually //

Reproduce by binary fission //

Not reproduce by binary fission //

Reproduce by regeneration

Not reproduce by regeneration

Frog, Housefly/ fly //

Amoeba, Starfish//

Amoeba //

Name of organisms

Starfish

4

Frog, Housefly/ fly, Starfish // Frog, Housefly/ fly, Amoeba

*Accept any suitable answer

(c)

(i)

Germination of seeds depends on the presence of water and air/ oxygen

1

(ii)

J / Test tube with wet cotton wool

1

(iii)

The seed will germinate with the presence of water and air/ oxygen/ The seeds need water and air /oxygen to germinate

1

TOTAL 8

(a)

(b)

3

10

The brightness of the bulbs depends on the number of bulbs (arranged in the circuit) // Bulbs in circuit P are brighter because there are less number of bulbs (compare to circuit Q) // (vice versa) The more bulbs (arranged in the circuit), the less brighter the bulb (vice versa)

1

(i)

0.7 // 0.70

1

1

(ii)

Refer to the Appendix 1

2

2

1

(iii)

The longer the length of nichrome wire, the lower the current // (vice versa)

1

1

(iv)

Length of nichrome wire

1

1

(v)

0.65A (unit is compulsory)

1

1

(vi)

Current is the reading of the ammeter / ammeter reading

1

1

1 1

2

(vii)

-

Correct symbols drawn – 1m Correct connection of circuit – 1m TOTAL

10

APPENDIX for Question 8 (c)

X X

0.8

X X

Current (A)

0.6

0.4

0.2

10

20

30

Length of nichrome wire (cm) -

All four points are correctly transferred – 1m A straight smooth line joining all the points – 1m

END OF MARKING SCHEME

40

50