2

SULIT 4551/3

[Lihat sebelah 4551/3 2014 Hak Cipta BPSBPSK SULIT*

No. Criteria Marks

1(a) Able to construct a table based on the following aspects:

P1: Title

Solution

Initial firmness of spinach strip

Final firmness of spinach strip P2: Data for solution

P3: Observation on the initial and final firmness of spinach strip

Sample answer:

Solutions Initial firmness

of spinach strip

Final firmness

of spinach strip

Distilled water Firm Firmer /Harder

Sucrose solution

of 45%

Firm Soft

1

1

1

3

(b) Able to state one inference for observation on the spinach strip in

the distilled water and in the sucrose solution of 45%

Sample answers:

(i)Spinach strip in distilled water

P1:Water diffuse out of cell by osmosis

P2:Cells become turgid

(ii)Spinach strip in sucrose solution of 45%:

P3:Water diffuse into the cell by osmosis.

P4:Cells become plasmolysed / flaccid.

1

1

Any 1

1

1

Any 1

1

1

3

SULIT 4551/3

[Lihat sebelah 4551/3 2014 Hak Cipta BPSBPSK SULIT*

No. Criteria Marks No.

(c) Able to determine the type of solution used in this experiment.

Answers:

i) ( Distilled water ) Hypotonic solution

ii) ( Sucrose solution of 45% ) Hypertonic solution

1

1

2

(d) Able to predict the condition of the spinach strip in 45% of

sucrose solution that is taken out and immersed into distilled

water.

Sample answers:

Prediction

P1: The strip become hard / firm

P2: The strip bends/curves outwards

Reasons

P3: Water diffuses into the cell of strip by osmosis

P4 : Distilled water is hypotonic to the cell of ( spinach ) strip

1

1

Any 1

1

1

1

2

SULIT 4

4551/3 2014 Hak Cipta BPSBPSK SULIT

No. Criteria Marks

(e) Able to determine the solution which is suitable to make fruit

pickles and give reasons.

Sample answers:

Name of solution:

P1: ( Name of solution ) Sucrose solution of 45%

Reasons:

R1: Sucrose solution of 45% is hypertonic to the cell of fruits

R2: Water diffuse out of the cell by osmosis

R3: Absence of water

R4: Prevent the growth of microorganism

R5 : Fruits last longer

P1 + any 2R

Note:

Wrong P1 , any R is not accepted

1

1

1

1

1

1

1

2

(f)(i) Able to determine the simple procedure to determine the solution

which is isotonic to the cell sap of the mustard green by using the

apparatus and materials given.

Sample answer :

P1: Weigh / Record the initial mass of mustard green strips

P2: Immerse the strips into sucrose solution of 10%,20%, and

30%

P3: For 20 minutes ( or any suitable period )

P4: Take out the strips and weigh the final mass ( of the mustard

green strips )

P5: Calculate the change in mass ( of the mustard green strips ) //

Plot a graph of change in mass ( of the mustard green strips )

against concentration of solution

1

1

1

1

1

1

Any 4

4

SULIT 5

4551/3 2014 Hak Cipta BPSBPSK SULIT

No. Criteria Marks

(ii) Able to list down the apparatus and materials in f(i) into their

respective variables.

Answers:

Manipulated variable

Distilled water

Sucrose solution of 10%,20% and 30%

Responding variable:

Electronic balance

Fixed variable:

Mustard green strip

1

1

1

3

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20 marks

SULIT 6

4551/3 2014 Hak Cipta BPSBPSK SULIT

No. Criteria Marks

2(a) Able to explain why the root tip is chosen for this experiment.

Sample answer:

P1: Root tip has meristem tissue

P2: Which is actively dividing by mitosis // High rate of mitosis

1

1

2

(b) Able to determine the stage of mitosis which occurs in a large

number and the small number on Photomicrograph 1.

Answers:

A large number Anaphase

Small number Metaphase / Prophase / Telophase

1

1

2

(c)(i) Able to name stage P and stage Q in Photomicrograph 1.

Answer:

Stage P Anaphase

Stage Q - Metaphase

1

1

2

(ii) Able to demonstrate the chromosomal behaviour in Stage P and

Q by cutting and pasting the diagram of chromosomes onto the

cell.

Criteria:

P1: Correct shape and number of chromosomes

P2: Correct arrangement of chromosomes

1

1

2

SULIT 7

4551/3 2014 Hak Cipta BPSBPSK SULIT

Sample answer:

Stage P

Stage Q:

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10

marks

End of marking scheme

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