final mark scheme (1)
TRANSCRIPT
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8/10/2019 Final Mark Scheme (1)
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SULIT 4551/2
4551/2 [Lihat sebelah
SULIT
2(a)
P : Phospholipid bilayer
2(b)
SCORING CRITERIA
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SULIT 4551/2
4551/2 [Lihat sebelah
SULIT
NO. SCORING CRITERIA Mark
3(a)(i)
(ii)
(iii)
(b)
(c)
Able to name the process of the movement of substances across
the plasma membrane as shown in Diagram 3(a) and Diagram
3(b)
Answer : Osmosis
Able to state type of solution A and B compared to the sap of the
plant.
Solution A :Hypotonic SolutionSolution B :HypertonicSolution
By immersing in hypotonic solution
Able to explain what happens to the cell in Solution A as shown
in Diagram 1(a).
-State the presence of concentration gradient
-State the direction of water movement-State the effect of water movement
Sample answer :
P1 : Solution A is hypotonic to the cell sap // cell sap ishypertonic to Solution AP2 : Water molecules move into the cell / plasma membrane throughosmosisP3 : The cell is turgid
Able to explain one method by which mango can be preserved fora long time.
Sample answer :Method : Pickling
Explanation :
P1: Mango is immersed into the vinegar/ salt/ (concentrated) sugarsolution
P2 : The concentrated sugar / salt solution is hypertonic to the mango/sap // cell sap is hyportonic to the concentrated sugar/ salt
P3 : water will be drawn out of the mango through osmosisP4 : this result in slower growth of the microorganisms / even death
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1
1
1
1
1
1
1
1
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Max 2
1
2
1
3
Methodand any
twoexplanation
3
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SULIT 4551/2
4551/2 [Lihat sebelah
SULIT
(d)
4 (a)(i)
(a)(ii)
(b)
(c)
(d)
(e)
Able to give one advantage and one disadvantage of preservation
method in (e)
Advantage : Give unique taste // Preserve vitaminsDisadvantage : High salt may lead to high blood pressure/kidney
failure // High concentration of sugar may leads to diabetes
X Y W Z
W : anaphase X : prophase Y : metaphase Z : telophase
Somatic cells
1.) Epithelial cells2.)Nerve cells/neurones
3.) Muscle cells4.) Any correct answers (reject : sperm and ovum)
Able to give two significance of mitosis
P1 : replaced/renew/damaged cellsP2 : for growth // make new cells
P3 : Maintain chromosomal number in organisms
Tissue culture
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1
2
3
1
111
1
111
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2
2
32 marks
(3 correct )1 mark ( 2 correct )
0 ( 1 correct )
1
Max3
Max2
Max
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1
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SULIT 4551/2
4551/2 [Lihat sebelah
SULIT
55(a)
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SULIT 4551/2
4551/2 [Lihat sebelah
SULIT
SECTION B
ITEM
NO
CRITERIA MARKS NOTES
6 (a) Similarities :
P1 :Both have double layer
Membrane // Both have outer and inner membraneP2 : Mempunyai cecair di dalam persekitaran dalaman / have
fluid in the internal environment .
Differences :
Mitokondrion Kloroplas
Folded cristae layer Thylacoids layer stacks toeach other
Function for cell respiration
//Generate ATP
-Function for photosynthesis
fluid-filled internalenvironment is called matrix
Internal fluid-filled internalenvironment called stroma
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1
1
1
1
4
At least onesimilarity given
Max
4
(b)P1 : Density of organelles depend on function of the cellP2 : Function of mitochondrion is to generate
energy // generate ATPP3 : The high density of mitochondria is because the cell
function require a lot of energyP4 : For example, sperm cells /meristems/ muscle cells //
Any relevant answers .
P5 : (The cells) need to swim through the fallopian tube/for cell divisions /for muscle contraction andrelaxation //Any relevant explanation
P6 :(Therefore) The number of mitochondria in those cellsare more than normal cells
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1 6
(c) P1 : The freshwater environment causes the concentrationof solute inside the cell is higher than outside the cell..
P2 : ( causes) water to diffuse in by osmosisP3 : Contractile vacuole expands to expel excess waterP4 : So that the organisms does not burst
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1
1
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(d) P1 : The internal physical and chemical factors need to bemaintained so that cells can function normally .P2 : Example : Temperature // Any relevant answers
P3 : Humans need to maintain the body temperature
around 36.7C // At 36.7, enzymes function
normally.P4 : If temperature is above the normal range, enzymes
will be denaturedP6 :If temperature is below normal range, enzymes will be
inactive
P7 : Rate of biochemical reactions lowers
1
1
1
1
1
1
6
Max
6
TOTAL 20
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SULIT 4551/2
4551/2 [Lihat sebelah
SULIT
8(a)
8(b)
8(c)
8(d)
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SULIT 4551/2
9
9(a)
9(b)
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SULIT 4551/2
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9(c)