JABATAN PELAJARAN PERAK

SOLAF 1SIJIL PELAJARAN MALAYSIA 2011

SCIENCE

Paper 2

MARKING SCHEME

This marking scheme contains 8 printed pages

1511ScienceSOLAF 1SPM2011

1511 SULIT

SULIT SOLAF 1

Paper 1

1 C 11 B 21 C 31 D 41 D

2 B 12 D 22 A 32 A 42 D

3 C 13 B 23 C 33 C 43 A

4 A 14 C 24 D 34 A 44 B

5 D 15 A 25 A 35 C 45 C

6 C 16 C 26 B 36 B 46 D

7 A 17 B 27 D 37 D 47 C

8 C 18 D 28 C 38 B 48 D

9 C 19 D 29 A 39 B 49 B

10 D 20 A 30 C 40 C 50 A

1511 SULIT 2

SULIT SOLAF 1

Paper 2

Question Mark Scheme MarkΣ Marks

1

(a) - 2o C

(b) (i) Thermometer reading decreases when common salt is added into the distilled water.

(ii) The presence of impurities / common salt reduce the freezing point of distilled water.

(c) (i) Presence of impurities / common salt. (ii) Freezing point // Thermometer reading.

1

1

1

11

Total

1

2

2

5

2

(c) Co

1

1

1

1

1

2

2

1

1511 SULIT 3

Height of student interval (cm)

Julat ketinggian pelajar (cm)146 – 150151 – 155156 – 160161 – 165166 – 170

Number of students

Bilangan pelajar291892

(a)

Number of students Bilangan pelajar

Height of students (cm) Ketinggian pelajar (cm)

146 - 150 0

10

20

30

151 - 155 156 - 160 161 - 165 166 - 170

(b)

SULIT SOLAF 1

ntinuous variation

Total 5

3

(a) Number of bacteria colony is highest at pH 7 // Bacteria growth well in a medium of pH 7 // Bacterial growth is highest at pH 7.

(b) (i) pH value. (ii) Number of bacteria colony // Bacterial growth.

(c) Temperature

(d) Use acids to preserve food.

1

11

1

1

Total

1

2

1

1

54

5

(a) (i) Reflex action

(ii) Controlled by spinal cord

(b) (i) Synapse

(ii) Sensory neurone

(c ) Knee jerk//withdraw hand when accidentally touched hot object (d) Prevent the body from injury // Avoid injury

1

1

1

1

1

1

Total

1

1

1

1

1

1

6

1511 SULIT 4

SULIT SOLAF 1

6

(c) (i) Voluntary action

(ii) Reading // Singing // Writing // Walking // Dancing // etc.

1

1

1

1

1

1

Total

1

3

2

6

7

(a) P : Bacteria Q : Viruses

(b) Aids // Hepatitis // Influenza

(c ) (i) Bacteria (ii) Viruses

(d) Through vector// Contaminated food and water.

111

11

1

Total

21

2

1

6

8

(a) (i) R : Ammonium compound

(ii) Dissolved nitrate ions

(b) (i) Nitrogen-fixing bacteria (ii) Denitrifying bacteria

(c) Leguminous plant // Legume

(d) Ammonium nitrate

1

1

1

1

1

1

Total

2

2

1

1

6

1511 SULIT 5

Neurone P : …………………….. Neuron P ……………………….....

Neurone Q : …………………….. Neuron Q ……………………….....

Organ R : ………………… ……………………….....

Effector Efektor

Receptor Reseptor

Diagram 5 Rajah 5

Sensory neurone Motor neurone

Brain

(a) & (b)

SULIT SOLAF 1

9

(a) (i) J : carbon dioxide

(ii) K : sulphur dioxide // nitrogen dioxide

(b) Save the environment from toxic gases // Reduce the emission of toxic gases to the environment. // Avoid air pollution

(c) Recycling

(d) (i) Compress and bury the plastic wast

(ii) Recycle the plastic waste

1

1

1

1

1

1

Total

2

1

1

2

6

10

(a) Metal can conduct electricity // Non-metal cannot conduct electricity // Different type of substance has different electrical conductivity

(b) (i) To study the electrical conductivity of metal and non-metal

(ii) Constant variable: Size of rod // Number of dry cell // Voltage of dry cell // Type of bulb

Manipulated variable: Metal and non-metal // Type of substance // Type of rod (iii) Apparatus and materials: Copper rod, glass rod, one dry cell, bulb, wire (iv) 1. Connect the battery to bulb with wire 2. Connect the copper rod to complete the circuit 3. Observe whether the bulb lights up or not. 4. Repeat the experiment using a glass rod

OR : Suitable diagram (v)

Type of substance //Type of rod // Metal or non-metal

Electrical conductivity

Copper rod // Metal rod

Glass rod // Non-metal rod

1

1

11

1

1111

1

Total

1

1

2

1

4

1

10

1511 SULIT 6

SULIT SOLAF 1

11

(a)Continuous variation Discontinuous variation

1. Does not show obvious differences in characteristics.

1. Shows obvious differences in characteristics

2. Influenced by environmental factors

2. Caused by genetic factors

3. Not inherited 3. Inherited4. Can be change. 4. Cannot be change5. The trait shows a normal distribution graph

5. The trait shows a discrete distribution graph.

[Any four factors]

(b) Two common characteristics: 1. Shows obvious differences in characteristics 2. Caused by genetic factor 3. Can be inherited 4. Cannot be change

[Any two characteristics]

Initial concept: Shows obvious differences in characteristic and caused by genetic factors is a discontinuous variation.

Another example: colour of eyes // types of hair

Non-example : Height // weight

Actual concept: A discontinuous variation is a variation that shows obvious differences in characteristics and is caused by genetic factors.

4

2

1

11

1

Total

4

2

2

11

1

10

12 (a) Excess with vitamin C: Disease : Scurvy-muscular pain Symptom : teeth loosen // bleeding gums

Excess with protein: Disease : Kwashiorkor- skin peels Symptom : lost of appetite // stomach swell

(b) Identification of problems : An adult is suffering from high blood pressure.

Clarification of the problem: Daily intake is rich with meat, coconut milk and animal fats.

11

11

1

1

4

1

1

1511 SULIT 7

SULIT SOLAF 1

Solving methods: 1. exercises regularly 2. eat less fat 3. eat more vegetables 4. take balance diet

[Any 3 methods]

Best method: - choose any one from solving methods Explanation: 1. To overcome the high blood pressure 2. to maintain healthy balanced diet

[1 method and explanation]

3

1

Total

3

1

10

1

1511 SULIT 8

SULIT SOLAF 1

1

1

2

51

1

1

1

1

Total

(a) When the area is more polluted, more dust particles deposited.

(b) The quantity of dust particles // Pollution level

(c) R

(d) (i) More dust particles accumulated on the cellophane tape.

(ii)

1511 SULIT 9