Science Paper 2 2012

SECTION A(40 marks)

Answer all questions

1) a) Diagram 1 shows an activity to study that oxygen is needed for respiration.

Diagram 1

i) In Diagram 1, draw an arrow in the box provided to show that the direction of the movement of red indicator after 10 minutes. [1 mark ]

ii) Give one reason for the answer in 1(a)(i).

________________________________________________________________________________ [ 1 mark] iii) Why cotton soaked with sodium hydroxide solution is used in this activity? _______________________________________________________________________________ [ 1 mark]

iv) What happens to the red indicator if another two cockroaches are added into the boiling tube? ________________________________________________________________________________[ 1 mark]

b) Diagram 2 shows an activity to study the effect of smoke from vehicles on living organisms

i) Why do the cockroaches in boiling tube P live longer than those in boiling tube Q?

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SEK. MEN. KEB. LAKI-LAKI METHODISTPEPERIKSAAN PERTENGAHAN TAHUN 2012

TINGKATAN 3______________________________________________________________________________Kod Kertas : 55/2 Penyedia : En. Yeoh Soon KhuanM/Pelajaran : Science Penyemak : En. Abdul Hakim bin Kader SultanMasa : 1 jam 30 minit Disahkan KB : Pn. Khoo Li LengBil calon : 212

Boiling tubeCotton soaked with sodium

hydroxide solution

Cockroach

Red indicatorWire gauze

AirBoiling tube P

Wire gauze

Boiling tube Q

Rubber stopper

Smoke from vehiclesDiagram 2

________________________________________________________________________________________

_________________________________________________________________________________[1 mark]

ii) Suggest one way to make the cockroaches in boiling tube Q live longer.

_________________________________________________________________________________[1 mark]

2) Diagram 3 shows two common defects of vision

Diagram 3

a) Name the defects of vision in X and Y in Diagram 1

X :____________________________________________________________________________ [2 marks]

Y :____________________________________________________________________________ [2 marks] b) State one cause of defects of vision in X and Y. X :_____________________________________________________________________________[ 1 mark ]

Y :_____________________________________________________________________________[ 1 mark ] c) Draw the type of lens to rectify the defects of vision in X and Y

X Y [2 marks]

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3) Diagram 4 shows the human respiratory system

Diagram 4 i) Name the parts labeled X, Y and Z [3 marks]

ii) State what will happen to the following parts during inhalation

X : ____________________________________________________________________________

Y : ____________________________________________________________________________ [2 marks]

b) i) Diagram 5 shows the pathway of air flow into the lungs during inhalation

Diagram 5

ii) Complete Diagram 5 with the words in the box

[2 marks]

iii) Name the part of human respiratory system that allows the exchange of gases

_______________________________________________________________________________ [1 mark]

4) Diagram 6 shows the phagocytosis process of white blood cell to a bacterium

Diagram 6

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Bronchiole Alveolus Nasal cavity

a) State what is the functions of white blood cells in our bodies.

________________________________________________________________________________ [1 mark]b) State the characteristics of white blood cells.

i)_______________________________________________________________________________

ii)______________________________________________________________________________ [2 marks] c) State the functions of the following components of blood

i) Red blood cell : _________________________________________________________________ [1 mark]

ii) Platelets: ______________________________________________________________________ [1 mark]

iii) Plasma: ______________________________________________________________________ [1 mark]

5) a) Diagram 7 shows a human arm

Diagram 7

i) Write down the correct answers in the box using the following words [3 marks]

ii) Give one example of levers which belongs to the same class as the one in Diagram 7

________________________________________________________________________________[1 mark]

b) Diagram 8 shows a type of lever

Diagram 8 Calculate the force, F required to balance the rod. [2 marks]

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Effort Fulcrum Load

6) Diagram 9 shows the changes of the states of matter

Diagram 9a) Name the physical state of P and Q P : ____________________________

Q :____________________________ [2 marks]

b) State the process X, Y and Z

X : _____________________________ Y : _____________________________

Z : _____________________________ [3 marks]

c) The particles of which physical state have the lowest energy ?

_______________________________________________________________________________[1 mark]

SECTION B(20 marks)

Answer all questions.

7) Diagram 10 shows a food web

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Eagle

a) i) Based on Diagram 10, write a food chain which consists of five organisms ______________________________________________________________________________ [1 mark]

ii) State one producer and one tertiary consumer

Producer : __________________________________________

Tertiary consumer : ___________________________________ [2 marks]

b) i) Name the type of interaction between the rat and snake in Diagram 10

____________________________________ [1 mark]

b) ii) State the method used to control the population of rats by using snakes

_____________________________________________________________________________ [1 mark]

c) What is the role of the decomposers?

_______________________________________________________________________________ [1 mark]

d) There are four organisms, P, Q, R and S in a food chain as shown in the Table 1

Table 1

i) Complete the different levels of the pyramid with the correct organisms

[1 mark]

ii) Arrange the organisms according to their size in ascending order

_____________________________________________________________________________ [1 mark]

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Diagram 10

Organisms Number of OrganismsP 40,000Q 50R 350S 5200

8a) Diagram 11 shows an activity to study seed germination

Diagram 11

State one inference about the seed germination in either test tube P or test tube Q.

___________________________________________________________________________________[1 mark]

b) Diagram 12 shows the stages in seed germination.

Diagram 12

i) Write one hypothesis about the physical changes of seedlings from Day 1 to Day 5.

________________________________________________________________________________________ [1 mark]

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Moist CottonMoist

CottonMoist

Cotton

Moist

Cotton

Day 1 Day 3 Day 5

Day 7

ii) Compare the size of the cotyledon during the physical changes of seedlings on Day 1 to Day 5.

________________________________________________________________________________________ [1 mark]

c) Table 2 shows the data of the observation of this activity.

i) In Table 2, record the height of physical change of seedling on Day 7. [1 mark]

ii) On the graph paper provided, draw a line graph using the data in Table 2

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Time (Day) 1 3 5 7Height of physical change of seedlings (cm)

0 1.2 2.8

[2 marks]

d) Based on the graph drawn in (c)(ii), state the relationship between the time and the height of the physical changes of seedlings.

________________________________________________________________________________________ [1 mark]

e) Predict the height of physical changes of seedlings on Day 10.

________________________________________________________________________________________

[1 mark]

f) State the variables involved in this activity.Manipulated variableResponding variable Controlled variable

[3 marks]

g) State the operational definition for the germination of seed.

________________________________________________________________________________________ [1 mark]

END OF QUESTION PAPER

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