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Marking schemeScience Form Two 2010

Section A

1. (a) M : Plant cellN : Animal cell(2 X 1 mark = 2 marks)

(b) P is marked/shown(1 mark)

(c)

(2 x 1 mark = 2 marks)

1

P

Q

R

S

Regulates the movement ofsubstances in and out of the cellMengawal pergerakan bahanbahanmasuk dan keluar dari sel

Protects and maintains the shapeof the cellMelindungi dan mengekalkanbentuk sel

Contains cell sapMengandungi sap sel

Controls all activities of the cellMengawal segala aktiviti sel

Structure

Struktur FunctionFungsi

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(d) cytoplasm / nucleus / cell membrane(1 mark)

2. (a) R : NitrogenQ: Oxygen

P : Carbon dioxide (3 x 1 mark = 3 marks)

(b) Gas P : by using lime waterGas R : by using glowing wooden splinter

(2 x 1 mark = 2 marks)

(c) Gas P increases(1 mark)

3. (a) Conduction(1 mark)

(b) Copper. The rate of expansion of metal is different/ copper expandsfaster than iron.

(2 x 1 mark = 2 marks)

(c) Electrical iron / fire alarm / rice cooker (any other suitable answer)(1 mark)

(d) (i) Radiation(1 mark)

(ii) Radiation can happen/occur in vacuum.

(1 mark)

4. (a) (i) Organism B(1 mark)

(ii) Because it makes its own food(1 mark)

(b) (i) 4(1 mark)

(ii) Paddy plant GrasshopperLizardEaglePaddy plantRatSnakeEaglePaddy plantRatEaglePaddy plantRatEagle

(1 mark)

(c) The other animal in the food chain will starve and reduce in numbers(1 mark)

2

Either one answer

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(d) There will be a decrease in the paddy population//there will be anincrease in snake population.

(1 mark)

(e) The sun (1 mark)5. (a)

(3 x 1 mark = 3 marks)

(b) P: Channels the food from the mouth into the stomachQ: Produces digestive enzyme (amylase, protease and lipase)R: Absorb water from the undigested food

(3 x 1 mark = 3 marks)(c) 1. Protein

2. Fat

3. glucose (3 x 1 mark = 3 marks)6. (a) i) salt

ii) water(2 x 1 mark = 2 marks)

(b) Beaker R(1 mark)

(c) Saturated solution(1 mark)

(d) i) Heating the solution in the beakerii) Adding more water into the beaker

(2 x 1 mark = 2 marks)

Section B7. (a) R: Has scales/has fins

S: Has shell/has antennaT: Has shell/has four legsU: Has hair/has two ear lobes

(4 x 1 mark = 4 marks)

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(b) Common characteristics: has shell; no shell (2 x 1 mark = 2 marks)(Characteristics used for comparison must be from the same category)

Names of animals: Snail, Tortoise; Fish, Cat

(All examples given in each group must be correct completely)

(2 x 1 mark = 4marks)8. (a) Friction acts in the opposite direction to the movement of the woodenblock.

(1 mark)(b) The reading on the spring balance when the block starts to move is

taken as the magnitude of the frictional force.(1 mark)

(c ) X: 8.5Y: 5.5Z: 2.5

(3 x 1 mark = 3 marks)

(d)

(2 marks)

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(e) Manipulated variable: Type of surfaceResponding variable: Magnitude of frictional forceConstant variable: Mass of wooden block/type of springbalance/surface area of block

(3 x 1 mark = 3 marks)

(f) The frictional force is a force which acts as a barrier tomovement/motion

(1 mark)

(g) Produces the speed of moving object/Wears out the surface incontact/ Produced heat which may damage parts of a machine oran engine

(1 mark)(Anyone of the above)

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