Q23 of 44 Page 32

Malarial fever is not caused in a person immediately after introducing the sporozoites by an infected anopheles mosquito. Why?

When female anopheles mosquitoes bite a healthy person, the sporozoites (the infectious stage) are introduced into his body. Sporozoites multiply within the liver cells first and enter the Red Blood Cells (RBC) of man, resulting in the rupture of RBC. This results in the release of toxic substance called haemozoin which is responsible for the chill and high fever, recurring every three to four days.


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21

Say whether each of the following diseases is a metabolic disorder, a genetic disorder or a nutritional deficiency disease.

i) thalassemia


ii) beriberi


iii) diabetes mellitus


iv) bubble boy syndrome


v) scurvy


vi) marasmus


vii) obesity


viii) Alzheimer’s disease


ix) nyctalopia


x) haemophilia


 22

Find the correct statement (True / False):

i) Tuberculosis is caused by Mycobacterium tuberculosis bacteria.


ii) Typhoid is caused by Trichophyton fungi.


iii) Malaria is caused by Plasmodium vivax.


iv) Influenza is caused by Entamoeba histolytica protozoan.


 24

Name the stages of Plasmodium.

i) introduced by an infected Anopheles mosquito.


ii) picked up by Anopheles mosquito from an infected human being.


 25

Name two diseases that are transmitted by houseflies. Mention their causative pathogens.