Final Mark Scheme (1)

8/10/2019 Final Mark Scheme (1)

1/10


2/10

SULIT 4551/2

4551/2 [Lihat sebelah

SULIT

2(a)

P : Phospholipid bilayer

2(b)

SCORING CRITERIA


3/10

SULIT 4551/2


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

1

1

1

1

1

1

1

1

1

1

1

1

Max 2

1

2

1

3

Methodand any

twoexplanation

3


4/10

SULIT 4551/2


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

1

1

2

3

1

111

1

111

1

1

2

2

32 marks

(3 correct )1 mark ( 2 correct )

0 ( 1 correct )

1

Max3

Max2

Max

1

1


5/10

SULIT 4551/2


SULIT

55(a)


6/10

SULIT 4551/2


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

1

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

1

1

1

1

1

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

1

1

1

14

(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


7/10


8/10

SULIT 4551/2


SULIT

8(a)

8(b)

8(c)

8(d)


9/10

SULIT 4551/2

9

9(a)

9(b)


10/10

SULIT 4551/2

10

9(c)

Final Mark Scheme (1)

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