(a part of SPM Qs 2008)
1. (a)(i )Explain how platelets help to stop bleeding when wound occurs [ 4 marks]
(ii) A blood test shows that a man’s erythrocytes count is below normal. Explain the possible consequences of this condition on his health.
What type of food should he include in his diet to improve his condition? [8 marks]
(b)Diagram shows the blood circulatory system in organism S and organism T.
Based on Diagram:
i. Give one example of organism S and organism T [2 marks]
ii. Describe the similarities and differences between the blood circulatory system in organism S and organism T. [6 marks]
Suggested Answer:
1 (a) (i)Platelets clump together and produce thrombokinase
Platlet bergumpal dan menghasilkan trombokinase
Thrombokinase converts prothrombin to thrombin
Trombokinase menukarkan protrombin kepada trombin
Thrombin converts fibrinogen (a soluble protein plasma ) to fibrin (vitamin K is needed in the formation of prothrombin)
Trombin menukarkan fibrinogen (protein plasma terlarut )kepada fibrin (vitamin K diperlukan dalam pembentukan protrombin )
Fibrin forms a network to traps the erythrocytes to form a clot
Fibrin membentuk jaringan untuk memerangkap eritrosit untuk membentuk darah beku
(ii) Less red blood cells to combine with oxygen
Kurang sel darah merah bergabung dengan oksigen
Less oxygen transported to body cells .Less energy is produced
Kurang oksigen di angkut ke sel-sel.Kurang tenaga dihasilkan
Resulting in tiredness ,Pale looking appearance and Anaemia
Menyebabkan keletihan, Kelihatan pucat dan anemia
Need Food rich in iron
Perlu Makanan yang kaya dengan zat besi
Examples : cockles ,liver , spinach
Contoh : Kerang ,hati ,bayam
(b)(i) S :
Fish
Ikan
T :
Human being
Manusia
(ii)
Similarities
Persamaan
Both have a closed circulation
kedua-duanya mempunyai peredaran tertutup
Blood flows in blood vessels
Darah mengalir dalam salur darah
The differences
Perbezaan:
...Girls..please check and do correction!
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