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7/29/2019 Skema Sains 2 Pmr Perc 2012
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SCIENCE
PMR
Ogos 2012
PEPERIKSAAN PERCUBAAN
PENILAIAN MENENGAH RENDAH 2012
SCIENCE
KERTAS 2
PERATURAN PERMARKAHAN
UNTUK KEGUNAAN PEMERIKSA SAHAJA
___________________________________________________________________________
Peraturan pemarkahan ini mengandungi 17 halaman bercetak
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No Mark Scheme Mark
1(a) Able to name the class of animal P, Q and R correctly
Answer
P: Reptilia Q: Amphibian R: Mammals
* 3 correct = 2 marks
* 2 correct = 1 mark2
1(b) Able to match with its characteristic correctly.
Answer
AnimalsHaiwan
CharacteristicsCiri-cirinya
PGiving birth to live young.Melahirkan anak
QLaying eggs without shell.Bertelur tidak bercengkerang.
RLaying eggs with shell.
Bertelur bercengkerang
1
1
1 3
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No Mark Scheme Mark
1(c) Able to choose animal which has the same class as animal R.
Answer
1
1
TOTAL A1 6
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No Mark Scheme Mark
2 (a)(i) Able to name the structure of L.
Sample Answer
1. Valve2. Bicuspid valve
Notes: If the name of the valve mention, only accept only bicuspid valve.
1 1
2(a)(ii) Able to state the function of structure L.
Sample Answer
1. To ensure that the flow of blood is in one direction.2. To ensure blood flows in one direction from the left atrium to the left
ventricle.
Notes: If sample answer is chosen, only accept the direction from the left
atrium to the left ventricle.
1 1
2(b)(i) Able to name the part labelled T.
Answer
1. Phloem 1 12(b)(ii) Able to state the function of the part labelled U.
Sample Answer
1. Transport water and dissolved mineral salts.2. Transport water and dissolved mineral salts from the root to the other
part of the plant.
3. Helps to support the plants. 1 1
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No Mark Scheme Mark
2(c)(i) Able to choose the person entitle to receive Sofeas blood.
Answer
PatientPesakit
Blood GroupKumpulan Darah
Emelda
O
Emeriz
AB
Erizmi
B
1 1
2(c)(ii) Able to state the type of blood which is called as universal donor
Answer
1. Group O 1 1TOTAL A2 6
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6
No Mark Scheme Mark
3(a) Able to label the position of pectorial girdle correctly.
Answer
1 1
3(b)(i) Able to state the support system of the whale
Answer
Water buoyancy 1 1
3(b)(ii) Able to give reason correctly
Answer
The whale has small endoskeleton that does not much support to its body
weight.
1 1
3(c) Able to state one common characteristic correctly.
Answer
Both animals have endoskeleton 1 1
3(d) Able to explain why water vertebrates can grow much larger.
Answer
The skeleton of the animal does not have to support the whole weight of the
animal because the upthrust of water does.
2 2
TOTAL A3 6
Pectorial girdle
Lengkungan pelvis
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No Mark Scheme Mark
4(a) Able to name the form of energy correctly.
Answer
1. Chemical energy 1 1
4(b)(i) Able to state the energy changes correctly
Sample Answer
1. Changes from kinetic energy to electrical energy2. Kinetic energy electrical energy 1 1
4(b)(ii) Able to state the advantage of the source of energy.
Sample Answer
1. Low cost or cheap2. Renewable3. Can be used over and over again4. Cannot be used up5. Never run out6.
Can be replenish7. Always available
8. Unlimited source9. No pollution10.Clean 1 1
4(c)(i) Able to choose which coconut has a higher potential energy.
Sample Answer
1. Coconut R2. R 1 1
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No Mark Scheme Mark
4(c)(ii) Able to explain how is the height of a coconut tree influence the potential
energy correctly.
Sample Answer
1. The higher the coconut tree, the higher the potential energy.2. The lower the coconut tree, the lower the potential energy.3. As the height of the coconut tree increases, the potential energy
increases.
4. As the height of the coconut tree decreases, the potential energydeceases.
5. The height of the coconut tree is direct proportional with the potentialenergy.
1 1
4(c)(iii) Able to explain why is coconut R produced louder sound when it falls?
Sample Answer
1. The coconut R tree is higher; it has a higher potential energy. Thesewill make it has a higher energy. Because of these, it will make the
sound become louder.
2. The coconut tree is higher; it has a higher potential energy and whenit changes to kinetic energy, the kinetic energy also higher compared
to S. Because of these, it will make the sound become louder.
3. Because it has a higher potential energy.4. Because it has a higher kinetic energy.
1 1
TOTAL A4 6
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9
No Mark Scheme Mark
5(a)(i) Able to complete the sequence correctly.
Sample Answer
1 1
5(a)(ii) Able to give one characteristic correctly.
Sample Answer
1. Thin wall (one cell thick)2. Lined by a thin layer of moisture3. Surrounded by large network of blood capillaries 1 1
5(b)(i) Able to state the condition correctly.
Answer
All correct - 2 marks
2-3 correct - 1 mark
1 correct - 0 mark
Structure of modelStruktur model
X Y
Volume in the glass jarIsipadu di dalam balang kaca increase decrease
Pressure in the glass jarTakanan di dalam balangkaca
decrease increase
1
1
2
5(c)(i) Able to state one problem correctly.
Sample Answer
1. Can have emphysema2. Heart diseases3. Bronchitis4. Lung cancer 1 1
PQRLungs
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No Mark Scheme Mark
5(c)(ii) Able to give a reason correctly.
Sample Answer
In the cigarette contain nicotine that makes a smoker addicted to it. 1 1
5(d)(i) Able to state the effect correctly.
Sample Answer
1. Can cause breathing difficulties2. Damage lung tissues
1 1
5(d)(ii) Able to suggest the way to reduce pollutant correctly.
Sample Answer
1. Use unleaded fuel2. Industries should install filters on smokestacks3. Car-pool practising 1 1
TOTAL A5 8
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11
No Mark Scheme Mark
6(a)(i) Able to state the uses of lime water.
Sample Answer
to check for the presence of carbon dioxide
1 1
6(a)(ii) Able to state the result of the observation.
Sample Answer
limewater turns cloudy // chalky.
1 1
6(a)(iii) Able to complete the words equation from the reaction.
Answer
All correct - 2 marks
1 correct - 0 mark
1
1
2
6(a)(iv) Able to state the element correctly.
Sample Answer
calcium, carbon and oxygen 1 1
Calcium carbonateheated calcium
oxide+
carbon
dioxide
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12
No Mark Scheme Mark
6(b)(i) Able to name the product formed.
Sample Answer
calcium hydroxide // slaked lime
1 1
6(b)(ii) Able to state the uses of the product.
Sample Answer
Slaked lime is added to the soil to reduce the acidity of the soil.
1 1
6(b)(iii) Able to give a reason.
Answer
Slaked lime is alkali. 1 1
6(c) Able to state changes of the colour of red litmus paper.
Sample Answer
ERed litmus paper turns blue.
1 1
TOTAL A6 8
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13
No Mark Scheme Mark
7(a)(i) Able to state the observation.
Sample Answer
P : Float on water//Timbul (terapung)di permukaan air
Q: Sink in water//Tenggelam dalam air
* P berada di atas air
Q berada di bawah air
1
1
2
7(a)(ii) Able to classify the object.
Sample Answer
Less dense than water : Object P
Denser than water : Object Q, R
1
1
2
7(a)(iii) Able to give an inference.
Answer
Inference :
1. P floats on waterbecause it less dense than water. Or
2. Q sink in waterbecause it denser than water. 1 1
7(a)( iv) Able to state the relationship.
Sample Answer
If the density of object is higher than density of water, it will be sink in
water.
or
If the density of object is lower than density of water, it will be float on
water.
1 1
SALAH
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No Mark Scheme Mark
7(b) Able to state the prediction.
Sample Answer
Cork : Float / Timbul
Wood : Sink / Tenggelam
1
1 2
TOTAL B7 8
No Mark Scheme Mark
8(a)(i) Able to state the difference by observing the diagram.
Sample Answer
Teapot M is black, Teapot N is white. // Teapot M is darker than Teapot N. 1 1
8(a)(ii) Able to state the result from observing the situation in the diagram.
Sample Answer
Coffee in Teapot M. // In Teapot M. // Teapot M. // M 1 1
8(a)(iii) Able to state a reason.
Sample Answer
The dark surface radiates heat better than the white surface. 1 1
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No Mark Scheme Mark
8(b)(i) Able to read the reading of the stop watch and record the reading.
Sample Answer
Conical flasks
Kelalang kon
eperatre of ater C)
Suhu air C)
0 minute
0 minit
10 minutes
10 minit
20 minutes
20 minit
30 minutes
30 minit
P 85 75 65 55
Q 85 79 73 67 1 1
No Mark Scheme Mark
8(c) Able to state the hypothesis correctly.
Sample Answer
The darker the colour of surface, the lower the temperature of water. /// if thecolour of the surface is darker, the temperature of water decreases / lower. //
The temperature of water lower / decreases when the colour of surface is
darker. 1 1
8(d) Able to state the variable involved in the experiment.
Sample Answer
Manipulated variable
Pembolehubah dimanipulasi
Colour of the surface / type of the surface
Responding variable
Pembolehubah bergerak balas
The temperature of water1
1 2
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No Mark Scheme Mark
8(e)(i) Able to draw a graph using the data in the table.
Sample Answer
1
1
2
eperatre of ater )
Time ( min )
60
70
80
90
0
10
20
30
40
50
10 20 30
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17
No Mark Scheme Mark
8(e)(ii) Able to state the relationship between the type of surface and the temperature
of water.
Sample Answer
1. The temperature of water is lower when the colour of surface is dulland dark but the temperature is higher when the colour of surface is
white and shiny.
2. The darker the surface, the lower the temperature of water.1 1
8(e)(iii) Able to make a prediction
Sample Answer
Less than 45oC 1 1
8(f) Able to define operationally the heat release
Sample answer
1. Heat release is shown by the decreasing of the temperature of waterin conical flask.2. Heat release is shown when the temperature of water in conical flaskis lower.
3. Heat release is the temperature of water 1 1TOTAL B8 12
JUMLAH 60