Percubaan Pmr Perak 2008 - Science Paper 2 (ans)

SectionA [40 marks] Answerall questions.

(a) Semicircularcanal1l)) Salur separa bulat

Cochlea(Q) Koklea

I{) Earossicles{ Osikeltelinga

[ 3 marks] [3 markah] (b) A m p l i f i e ss o u n dw a v e s Menguatkan gelombang bunyi Controfs the balanceof the body Mengawal ke,se i mbangan badan Convertsoundvibrationto nerveimpulses Menukarkan getaran bunyi kepada impul.ssaraf

[2 marks] [2 markah] (c)

Microphone/ loudhailer/ earphone/ stethoscope/ioudspeaker

I I mark] I rnarkah]

(a)

Lungs I mark] I I markahJ To pumpbloodto the wholebody I I mark] I markahJ I

(b) a a a a a a a

A a a a a a I

Whole body (except lungs) Seluruh badan (kecuali peparu)

[2marks] [2 markahJ (c)

(d)

underlow P: The lumen is large/hasvalve/lessmuscularand lesselasticrblood blood pressure/deoxygenated cell thick/bloodundervery no valves/nonmuscular/one is very small/ Q:The lumen bloodi and oxygenated little pressure/deoxygenated I I mark] [ 1 markah] more oxygen carries blood The tissues/ the to To supply more oxygen [1 mark] I I markah]

X : c o n d e n s a ti o n Y : Bo i l i n g

(b\

[2 marks] [2 markah] // odourless//boilingpoint at l000cllmeltingpoint at00Cllhasa density i. Colourless// tasteless of I g/cm3ll abadlpoorconductorof heatllbad/poorconductorof electricity I mark] pmarkahJ boiling point higher(than l00oC)

(c)

I mark] flmarkahJ

ProcessZ ProsesZ

8E CO Il marks] f lmarkahJ

@

Heatis absorbed

[2 marks] [2 markah

(a)

ll 2 ( classlever) i. Second

I I mark] I I markahJ in opposite act ii. The load is betweenthe fulcrum and the effortlthe load and effort direction.

(b)

I mark] I markahJ I

Q needslesseffort than P to pull out the nail

I mark] p markahJ

(c.)

30kgxX:25kgx l.2rn. 3 0X :

30

X:lnt.

[2 marks] [2 markahJ

(d)

f)i:rgr-:rnr (i-J ( R:r j:rh 6-J )

(a)

Mouth

Oesophagus

l-1 * Il l stomach |

5 correct - 2m, 3 correct - l m

(b)

Q will contractand relax

(c) : Glucose i.Carbohydrates Karbohidrat

[2 marks] [2 markahJ I I mark] markahJ I I

ii. Proteins : A m i n o a c i d Protin iii.Fats : Glycerol and Fatty acid Lemak [3marks] [3 markahJ Viskingtube [ 1 mark] I I markahJ The enzymein salivafunctionsbestat bodytemperature I I mark] I markahJ I (a)

i.P I I mark] I I markahJ ii. CanP losesheatfasterthancanQ

(b)

[1 mark] markahJ fl

i. The black surface// P

[1 mark] markahJ I I ii. Lower than 5 50Cllmore heatradiate

(c)

[1 mark] fl markahJ u'ill rvarm longer) rentain (so hot drink heat, the The transmission / radiationof I mark] fl marknhJ Convectionof heat/hotair in the overr ( so the cake will cook faster)

I mark] p markah] (d)

Black colour radiateheat better than white / shinv colour [1 mark] [I markahJ

(a)

(i) (ii) (iii) (iv)

Paramecium/ Paramesium: Binaryfussion Chlamydomonas/ klamidomonas : Binaryfussion StarfishiTapak Sulaiman:Regeneration HydralHidro: Budding [ 4 marks] [4 markahJ

(b)

Paramec C h larnydomonas, i um. H1,dra,Starfish Ameba, Lintah bulan, Hidra, Tapak Suktiman

Has flagellum/has cilium/has tentacles

Common characteristic Ciri Sepunya

Doesnot have flagellum/Doesnot havecilium/Doesnot havetentacles

Hydra.starfish. Paramecium/ Chlamydomonas, Hydra, Star fi sh/Chlar,rydomonas, Paramecium. starfish

Chlamydomcnas/ Paramecium/ Hydra

Name of the organisms lYama organisma

[4 marks] 14narkahJ

(a)

36 secI saat// Time taken Masa yang riiombil

ll

r8

30

36

47

I markl I markah] I (b) (i) Manipulatedvariables

Volume of the conlainer

P embolehubah d imanupula,si

(ii) Responding variables

How long a candle burn.s/ time taken

Pembolehubah bergerakbalas ( i i i ) F i x e dv a r i a b l e s

Size of cctndle/ type of candle

P embo lehubah d i mal arkan 13marksl [3 markohJ (c)

The bigger lhe container, the longer the burning time of a candle.

I mark] fl ntarkahJ (d)

50

40 Time taken

30 1 20 10

0

400

600

800

1000

Volumeof glasscontainer

1200

[3 marks] [3 markahj

(e) 33 sec. As the volumeof the containerincreases,the time taken-forthe candleto burn also increases

(fl

12marksl [2 markahJ

The time takenfor the candle to burn decredses Exhaled air contains more carbon dioxide / less oxygen [2 mark] [2 markahJ