2017 - WAEC Biology Past Questions and Answers - page 3
21
Which of the following types of placentation is not common amongst syncarpous pistils?
A
Marginal
B
Axile
C
Parietal
D
Free central
22
The complex energy-rich organic matter which living organisms need for life is
A
water
B
air
C
food
D
mineral salts
23
Which of the following processes are associated with photosynthesis? I. Energy from sunlight is absorbed  II. Carbon dioxide is evolved  III. Oxygen is given off  IV. Glucose is synthesized
A
I and II only
B
I, II and IV only
C
I, III and IV only
D
I, II, III and IV
24
Which of the following function is associated with calcium in plants? Formation of
A
cell wall
B
ribosomes
C
proteins
D
cell membrane
25
The diagram above shows the dentition of an organism. What organism is this?
A
rabbit
B
cat
C
frog
D
man
26
The diagrams below show the dentition of an organism. The function of the teeth labelled X is for
A
biting and grasping
B
chewing and grinding
C
tearing and grasping
D
chewing and tearing
27
The teeth which are absent in the young of the organism whose dentition is shown above is labelled
A
W
B
X
C
Y
D
Z
28
The number of individuals that the environment can support over a long period of time is its
A
growth rate
B
total capacity
C
population capacity
D
carrying capacity
29
A good site for secondary succession would be
A
a sand dune
B
a bare rock
C
a land that has just had forest fire
D
a stretch of barren land
30
A population which exceeds its carrying capacity and then collapses is represented graphically by a
A
bell-shaped curve
B
linear curve
C
sigmoid curve
D
skewed curve
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