ANSWER SCHEME SCIENCE FORM 4 PAPER 2 2010

1. (a) 7,8,4,6

(b)

(c) Type of variation is discontinuous variation

2 (a) 102oC(b) Impurities in the water increase the boiling point.(c) (i) Manipulated variable: Type of water

(ii) Responding variable: Boiling point of the water(d) Distilled water is a substance that boiled at 100 oC

4 (a)

Number of pupils

Group of thumb printsCurve Loop Whorl Composite

10

8

6

4

2

0

Weight/Berat badan / kg

41 - 45 46 - 50 51 - 55 56 - 60 61 - 65 66 - 70 71 - 75 76 - 80

Number of students/Bilangan

pelajar1 3 5 6 6 3 4 2

Correct 4 hingga 7 1 m All correct- 2 m

(b)

Transfer all points corrrectly – 1 m Bar chart has th – 1 m

(c) Continous variation/Variasi selanjar. 1 m

Total 5 m

40 45 50 55 60 65 70 75 80 85

Number of student/Bilanganpelajar

6

5

4

3

2

1

5 (a) P : Cell body Q : EffectorsR : Receptor

(b) Muscle contract

(c) (i) Reflex action (ii) Spinal Cord

6. (a) (i) R : Thyroid

(ii) Low metabolism rate // Physical retardation // Mental retardation

(b) (i) S : Testis

(ii) To control the secondary sexual characteristics of male

(c) (i) Excessive secretion of growth hormone

(ii) Pituitary gland

7 (a) Voluntary action (b) (i)

(ii) Cerebrum

(c) (i) Sensory neurone(ii) Muscle // leg

(d) The student cannot kick the ball

8 (a) discontinuous variation (b) the ability to roll the tongue @ thumb prints @ blood group @ hair type (c) genetic factor (d)

(e) free ear lobes

9 (a) Q : Boy/male (lelaki)

Tt Tt Tt Tt

R : Boy/male (lelaki)2m(b) Fertilization (Persenyawaan)1 m(c) (i) Identical twins (Kembar seiras)1 m

(ii) One ovum is fertilized by one sperm (to form one zygote)// 1m

the zygote formed splits into two(Satu ovum disenyawakan oleh satu sperma (dan membentuk satu zigot)// Zigot yang terbentuk membahagi dua)

(d) Siamese twins is formed (Kembar Siam terbentuk)1 m

10 (a) As the mass increases, the oscillation period increases.1 m

(b) (i) Aim : To study the relationship between the mass of load with the oscillation period

1 m

(ii) Manipulated variable : mass of loadResponding variable : oscillation period Fixed variable : length of string / swing force / swing angle (any two)

2 m

(iii) Apparatus / material:500 g and100 g loads, string, retort stand (2 stop watch)

1 m

(vi) Procedure:1. Hang the 500g load to the retort stand.

1 m2. Swing the load and state the time until the load

stops swinging.1 m

3. Repeat steps 1 and 2 for 100 g load1 m

(v)Mass of load(g) Oscillation period

500100

1 m

(vi) Hypothesis is accepted // if the mass of the load increases, the oscillation period also increases.// other suitable hypothesis.

1 m

Total 10 m

11 (a) Able to state 2 parts of brainAnswer:Cerebrum , cerebellum , medula oblongata (any two) 2 m

Parts of brain Main fuctionCerebrum Control controlled actions Cerebellum Control body balance Medula oblongata Control uncontrolled actions

(Any two correct pairs)2 m

Total 4 m

b) Able to show steps in developing concept Identify two identical characteristics

2 m Develop early concept

1 m Give another example

1 mand non-example 1 m

Explain the real concept 1 m