usi biof5scheme (repaired)

7/27/2019 Usi Biof5scheme (Repaired)

1/5

SKEMA

SEKOLAH MENENGAH KEBANGSAAN ALOR PONGSU,34300 BAGAN SERAI, PERAK

UJIAN SELARAS 1 (MAC 2012)BIOLOGI TINGKATAN 5

PART A

1. C 5. A 9. C 13.A 17. A 21 B 25 B

2. A 6. C 10. C 14. D 18. B 22 B

3. B 7. B 11. A 15. A 19. A 23 D

4. C 8. D 12. A 16. B 20. B 24 C

PART B

1 (a)Sample Answer:

Platelets clump together and produce thrombokinase / thromboplastin

(1)

Thrombokinase converts prothrombin to thrombin (calcium ions must be

present) (1)

Thrombin converts fibrinogen to fibrin (Vitamin K is needed in the formation of

prothrombin) (1)

Fibrin forms a network to traps the erythrocytes to forms a clot (1)

b) Diagram shows the blood circulatory system in organism S and organism T.

Based on Diagram 7.2:


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(i) Give one example of organism S and organism T.[2 marks]

Organism S Fish

Organism T Human being

(ii) Describes the similarities and differences between the blood circulatory system

in organism S and organism T. [6 mark

Similarities

1- Both have a closed circulation2- Both have a heart which acts as a pumping organ3- Blood flows in blood vessels

Differences

Organism S Organism T

1. Single circulation

2. Heart divided into 2 chambers

3. Chambers of heart are not separated

by septum

4. Oxygenated blood flow from gills tothe body cells/tissues

1. Double circulation

2. Heart divided into 4 chambers

3. Chambers of heart are separated byseptum

4. Oxygenated blood flows from lungs toheart

Question 2

3. Figure 3 shows the human circulatory system.


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Figure 3

(a) Name circulations R and S. Describe each circulation.

(i) R: Pulmonary circulation

Description: Oxygenated blood is pumped into the heart through the pulmonaryvein. Deoxygenated blood from the heart is pumped to the lungs through pulmonary

artery.

(ii) S: Systemic circulation

Description: Blood is pumped throughout the body via aorta. Deoxygenated bloodreturns to the heart through vena cava.

[6 marks]

(b) On Figure 3, mark the following flow of blood to illustrate the circulations R and S.

Oxygenated blood with the arrow ( )

Deoxygenated blood with the arrow ( )[1 mark]

(c) The pacemaker of a patients heart fails to function. An electronic pacemaker is used toreplace the original pacemaker.

Explain how the electronic pacemaker works.


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An electronic pacemaker will give the first heartbeat. It acts as sinoatrial node andgenerates impulse.

The impulse is spread to all atrium muscle, then to the atrioventrical node until thewhole heart beats.

Question 3

No Marking Criteria Marks

(a) Able to name vertebra in region P and R and state their specificstructure characteristic .

Sample Answer :P :Name : cervicle (vertebrae)Characteristic : have (a pair of) transverse foramenR :Name : Lumbar (vertebrae)Characteristic : processes short /thick // large centrum

11

11 4

(b) Able to explain the similarity.Sample answer :F1: both have several (bony spinous/ transverse) processesP1: for muscle attachment

F2: both have facet / articulation surfaceP2: to articulate with next vertebrae

F3: both have centrumP3: to absorb shock/ provide support

F4: both have vertebral foramenP4: to provide passage of spinal cord

Any F with correspond P

11

11

11

11

Max 2 2c (i)

(ii)

Able to name structure SAnswer :Intervertebral disc

Able to explain the function of structure SSample answer :F: permit movement of vertebral columnP: absorb shock / reduce friction

1

11

3

d (i)

(ii)

Able to give reason why eats plenty of dairy products is a good idea.Sample Answer :P: provide plenty of calcium (which help to reduce the effects of

osteoporosis)

Able to state two possible disadvantages of having a hip replacement.Sample answer:P1: it may cause the surrounding tissue to become inflamedP2: PainfulP3: dislocation /blood clotP4: risk of infection after surgeryP5: her legs may not be exactly the same lengthP6: the artificial hip will eventually need replacing

1

111


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Any 2 P

111

Max 2 3

TOTAL 12

usi biof5scheme (repaired)

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