A class of students was studying the features of some human pathogens. One of the students constructed a flow chart to identify four different human pathogens. The student used information about the structure and mode of transmission of each of these pathogens. Fig. 3.1 shows the partially completed flow chart. Complete the flow chart in Fig. 3.1 by identifying: - the modes of transmission - the scientific names of the pathogens - the name of one of the diseases.

Biology

IGCSE&ALevel

CAIE

Exam No：9700_s24_qp_21 Year：2024 Question No：3(a)

Answer:

Knowledge points:

10.1.1 state that infectious diseases are caused by pathogens and are transmissible

10.1.2.1 cholera – caused by the bacterium Vibrio cholerae

10.1.2.2 malaria – caused by the protoctists Plasmodium falciparum, Plasmodium malariae, Plasmodium ovale and Plasmodium vivax

10.1.2.3 tuberculosis (TB) – caused by the bacteria Mycobacterium tuberculosis and Mycobacterium bovis

10.1.2.4 HIV/AIDS – caused by the human immunodeficiency virus (HIV)

10.1.3 explain how cholera, malaria, TB and HIV are transmitted

10.1.4 discuss the biological, social and economic factors that need to be considered in the prevention and control of cholera, malaria, TB and HIV (details of the life cycle of the malarial parasite are not expected)

Answer:

Knowledge points:

Solution:

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