b) An atom of an element has 8 protons and 8 neutrons. State its valency
35) a) Distinguish between infectious and non infectious diseases. Give two examples of each.
b) Write the causative agent and mode of spreading of the following diseases.
i) Sleeping sickness
ii) Kala-azar
iii) Malaria
iv) Covid
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8 protons , therefore atomic number = 8 .. Oxygen - valency = 2
Infectious diseases are diseases that can spread from the infected individual to a healthy individual , eg : AIDS , Malaria
Non infectious diseases cannot spread from one individual to another . Eg : Cancer , Autoimmune disorders
i) sleeping sickness - protozoan called Trypanosoma gambiense , spread by TseTse fly
ii) Kala azar - protozoan Leishmania donovani , vector is Sand fly
iii) Malaria is spread by a protozoan called Plasmodium spread by female anopheles mosquito
iv) covid - coronavirus
Infectious diseases are diseases that can spread from the infected individual to a healthy individual , eg : AIDS , Malaria
Non infectious diseases cannot spread from one individual to another . Eg : Cancer , Autoimmune disorders
i) sleeping sickness - protozoan called Trypanosoma gambiense , spread by TseTse fly
ii) Kala azar - protozoan Leishmania donovani , vector is Sand fly
iii) Malaria is spread by a protozoan called Plasmodium spread by female anopheles mosquito
iv) covid - coronavirus
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