Ncert Exercises & Solutions

3. How does the transmission of each of the following diseases take place?

(a) Amoebiasis (b) Malaria (c) Ascariasis (d) Pneumonia

	Disease	Causative organism	Mode of transmission
a.	Amoebiasis	Entamoeba histolytica	It is a vector-borne disease that spreads by the means of contaminated food and water. The vector involved in the transmission of this disease is the housefly.
b.	Malaria	Plasmodium sp.	It is a vector-borne disease that spreads by the biting of the female Anopheles mosquito.
c.	Ascariasis	Ascaris lumbricoides	It spreads via contaminated food and water.
d.	Pneumonia	Streptococcus pneumoniae	It spreads by the sputum of an infected person.