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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
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22

The complex energy-rich organic matter which living organisms need for life is

A
water
B
air
C
food
D
mineral salts
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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
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24

Which of the following function is associated with calcium in plants? Formation of

A
cell wall
B
ribosomes
C
proteins
D
cell membrane
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25

The diagram above shows the dentition of an organism. What organism is this?

A
rabbit
B
cat
C
frog
D
man
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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
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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
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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
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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
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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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