Science Paper 2 2012
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Transcript of Science Paper 2 2012
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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
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________________________________________________________________________________________
_________________________________________________________________________________[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
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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]
4
Effort Fulcrum Load
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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
5
Eagle
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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
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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
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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
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[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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