49) To compare experimental group, scientists use:
a) control group
b) dead group
c) another experimental group
50) After experiment, it was found that Plasmodium was found in the patients’ blood. So the hypothesis “plasmodium is the cause of malaria” is now……...
a) correct
b) false
c) rejected
51) “People who slept in open places suffered from malaria” it was the observation of:
a) Ronald Ross
b) A. F. A. King
c) Laveran
d) Louis Pasture
52) “Persons who slept near a smoky fire usually did not get malaria” it was the observation of:
a) Italians
b) A. F. A. King
c) Laveran
d) Greeks
53) “People using nets did not suffer from malaria” it was the observation of……….
a) Italians
b) Laveran
c) A. F. A. King
d) Greeks
54) A. F. A. King list……..observations about malaria:
a) 10
b) 20
c) 30
d) 35
