gce winter 2010 - question paper - KCSE Online

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10 Examiner only 5. There are four parasitic species which can cause malaria in human beings. Plasmodium vivax and Plasmodium ovale cause tertian fever, characterised by a sharp rise in temperature on alternative days. Plasmodium malariae causes a temperature rise every three days and Plasmodium falciparum produces irregular fevers, often on a daily basis. The chart below shows the temperature fluctuation in a malaria patient. 41 40 Fever Fever 39 Temperature/°C 38 37 36 24 48 72 96 120 Time in hours (a) Name two species of Plasmodium which are unlikely to be responsible for the illness in this patient. [2] ........................................................................................................................................................................................................................ ........................................................................................................................................................................................................................ (b) Explain the cause of the peaks on the graph. [2] ........................................................................................................................................................................................................................ ........................................................................................................................................................................................................................ ........................................................................................................................................................................................................................ ........................................................................................................................................................................................................................ (314-01)
11 Examiner only (c) Suggest an explanation for the temperature at 36 hours. [1] ........................................................................................................................................................................................................................ ........................................................................................................................................................................................................................ (d) (i) What is the vector for the Plasmodium parasite? [1] ......................................................................................................................................................................................................... (ii) Give three possible methods of preventing transmission of malaria by the vector. [3] 1. ............................................................................................................................................................................................ ............................................................................................................................................................................................ 2. ............................................................................................................................................................................................ ............................................................................................................................................................................................ 3. ............................................................................................................................................................................................ ............................................................................................................................................................................................ (e) After being introduced into the blood stream where in the body does Plasmodium first multiply?. [1] ........................................................................................................................................................................................................................ (f) Give two disadvantages of controlling this infection with drugs. [2] ........................................................................................................................................................................................................................ ........................................................................................................................................................................................................................ (g) Suggest why there are no really successful vaccines for malaria. [1] ........................................................................................................................................................................................................................ (Total 13 marks) (314-01) Turn over.
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Page 3 and 4: 3 Examiner only (b) NAD is a compou
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Page 7 and 8: 7 Examiner only (iii) Draw the resu
Page 9: 9 Examiner only (iii) Draw a line o
Page 13 and 14: 13 Examiner only (iv) Using the inf
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