2018 - WAEC Biology Past Questions and Answers - page 4
31
Which of the following instruments is used to determine the turbidity of water?
A
hygrometer
B
hydrometer
C
secchi disc
D
rain gauge
32
In an ecosystem, the least efficient energy transfer link is from the
A
secondary consumers to decomposers
B
sun to producers
C
primary consumers to secondary consumers
D
producer to primary consumers
33
Xerophytes have the following characteristics aimed at conserving water except
A
thick cuticle
B
broad leaf surfaces
C
sunken stomata
D
waxy cuticle
34
An association between living organisms in which one lives on and feeds at the expense of the other is known as
A
commensalism
B
predation
C
parasitism
D
mutualism
35
When large numbers of organisms share limited space and resources, the immediate result is
A
extinction
B
emigration
C
competition
D
immigration
36
Which of the following disease ic caused by a bacterium?
A
ringworm
B
poliomyelitus
C
syphilis
D
malaria
37
Conservation of wildlife is necessary mainly because
A
wild species cannot resist disease better than their domesticated species
B
many predator wild animals help in the control of pests
C
it prevents extinction of species
D
many people derive pleasure from observing wild animals
38
Two unconscious patients X and Y whose blood group genotypes are AO and AB respectively were transfused with the blood from the same donor . Patient X immediately showed signs of difficulty in breathing while patient Y showed no negative reaction.
Patients X and Y were likely transferred with blood of genotype
A
OO
B
AO
C
BO
D
AA
39
Two unconscious patients X and Y whose blood group genotypes are AO and AB respectively were transfused with the blood from the same donor . Patient X immediately showed signs of difficulty in breathing while patient Y showed no negative reaction.
What should the hospital have done to prevent X from showing the symptom described above? Patient X should have
A
undergone an agglutination test
B
been asked for the blood group
C
been screened for HIV
D
undergone malaria test
40
The greatest contribution to genetic studies was made by
A
Gregor Mendel
B
Thomas Morgan
C
Charles Darwin
D
Robert Hooke
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