SULIT 4551/2

Section BAnswer all the questions

1 Diagram 1.1 shows a photomicrograph showing stages in a cell cycle that occur in the animal skin.

Diagram 1.1(a) (i)State the type of cell division involved in the cell cycle.

[1 mark] (ii) State one reason for your answer in (a)(i). ...

..... [1 mark](b) (i) Explain the chromosomal behaviour in stage N. .......... . [2 marks] SULIT 4551/2

(ii) State the importance of the chromosomal behaviour in mentioned in (b)(i). . . [1 mark]

(c) Somatic cells of the animal has four chromosomes. In Diagram 1.2, draw and label a diagram showing the chromosomal behavior after stage M.

Diagram 1.2 [3 marks](d) (i) A farmer wants to breed a good variety of banana plants for commercial production. Suggest a suitable method to be used which involved the cell cycle in Diagram 1.2.

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.. [1mark]

SULIT 4551/2

(ii) Explain how the method named in (d)(i) can increased the crop yield.

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. [3 marks]

SULIT 4551/2

2 Diagram 2.1 shows three stages X, Y and Z in meiosis

X y Z Diagram 2.1

(a) (i) Name stages X and Y. X :

Y :

[2 marks]

(ii) State two differences between chromosomal behavior at X and Y. .

. [2 marks ](b) ( i) State the occurrence at Z.

..

[ 2 marks ] SULIT 4551/2

(ii) The chromosome number in somatic cell of this organism is 12. State the

chromosome number in each of the daughter cell in Z. Give a reason for your answer.

[2 marks](c) Diagram 2.2 shows the process of sperm formation in the human testis.

Diagram 2.2

(i) Are cells A, cell B and cell C genetically identical? Explain.

..

.. [2 marks] (ii) If Cell B undergoes an improper cell division, cell D might receive an extra chromosome. State the number of chromosomes in Cell D.

[ 1 mark ] (iii) If cell D fertilises with an ovum, the zygote formed might develop into an abnormal male. State the syndrome of the individual.

[ 1 mark ] SULIT 4551/2

3. Diagram 3 shows the human digestive system. Diagram 3(a) (i) Name an enzyme found in P.

[1 mark]

(ii) Based on your answer in (a)(i), write a word equation to show the process of food

digestion in P.

[2 marks]

(b) (i) State the final product of protein digestion in S. [1 mark] (ii) State one importance of the final product that stated in (b)(i).

[1 mark]

SULIT 4551/2

(c) (i) Based on Diagram 3, name the food that contains carbohydrate. [1 mark]

(ii) Name an enzyme involved in the digestion of carbohydrate in R. .

[1 mark]

(d) State one importance of roughage in digestion. .[1 mark]

(e) After having a meal as shown in Diagram 5, the formation of gallstone occurs in gall bladder. Explain about the formation of gallstones.

.

.

[4 marks]

Section CAnswer all the questions

An experiment is carried out to investigate the content of vitamin C in certain fruit juices. The experiment is as follows :

1. Preparation of fruit juices is shown in Diagram 1(a).

2. Standard ascorbic acid is used to decolorize the DCPIP as shown in Diagram 1(b).

3. The steps are repeated for lime juice and pineapple juice.

4. Results of the experiment are shown in Table 1.

(a) (i) Based on Table 1, state one observation from the experiment.

Observation :

..

..

..

[3 marks]

(ii) State one inference which corresponds to the observation made in 1(a)(i).

Inference:

..

..

..

..

[3 marks]

(b) (i) Complete Table 2 based on this experiment.

VariableMethod to handle the variable

Manipulated variable

.

.

.

Responding variable

..

.

.

Controlled variable.

.

.

.

Table 2

[3 marks](c) State the hypothesis for this experiment.

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..

..

..

[3 marks](d) Concentration of vitamin C in fruit juices are calculated using the following formula

Construct a table and record the results of the experiment which include the following

aspects:

Type of fruit juices

Volume of fruit juices required to decolourise DCPIP solution

Concentration of vitamin C

[3 marks]

(e) State the relationship between the volume of fruit juice required to decolourise DCPIP solution and the concentration of vitamin C in the fruit juice.

[3 marks](f) The following lists are some of the apparatus and material used in this experiment.

Syringe 5.0 ml, lime juice, specimen tube, DCPIP solution, 0.1% ascorbic acid solution, scalpel.Categorise the apparatus and materials used in this experiment.

ApparatusMaterials

[3 marks]

(g) Predict the volume of lime juice needed to decolorize DCPIP solution if it is exposed to the air for two hours. Explain.

..

..

[3 marks]THE END OF THE QUESTIONSPrepared by,

.

(Cik Salwana Bt Othman)

Biology Teacher,

Kolej Tunku Kurshiah

Verified by,

.

(Pn Norizan bt Mohd Darawi)

Head of Biology Panel,

Kolej Tunku KurshiahApproved by,

.

(Pn. Wan Suryani bt Wan Razali)

Head of Science & Maths Dept,Kolej Tunku Kurshiah

For

Examiner s

Use

N

M

a (i)

a (ii)

b (i)

For

Examiner s

Use

b (ii)

c

d (i)

For

Examiner s

Use

d (ii)

TOTAL

For

Examiner s

Use

a (i)

a (ii)

b (i)

For

Examiner s

Use

b (ii)

c (i)

c (ii)

c (iii)

TOTAL

For

Examiner s

Use

Bread

Sausage

Butter

Salad

S

R

Q

P

a (i)

a (ii)

a (ii)

b (i)

b (ii)

For

Examiner s

Use

c (i)

c (ii)

d

e

TOTAL

Table 1

Concentration of vitamin C = volume of ascorbic acid used to

decolourise DCPIP solution x 1.0 mg/ml

volume of fruit juice used to

decolourise DCPIP solution

26