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1990 - WAEC Biology Past Questions and Answers - page 3

21

The mechanism by which useful materials in the glomerular filtrate are taken back into the blood is known
as

A
filtration
B
reabsorption
C
haemolysis
D
osmosis
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22

Which of the following takes place during the process of detoxication in the liver?

A
Poisonous substances in the body are converted into harmless substances
B
Fats and oils are broken into finer particles through emulsification
C
Excess glucose in the blood are converted into glycogen and stored
D
Worn- out red blood cells are broken down
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23

The cup-shaped part of the Bowman’s capsule contains

A
nephridium
B
glomerulus
C
loop of Henle
D
nephron
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24

The increase in width of blood vessels in the mammalian skin at high temperatures is known as

A
vasodilation
B
sweating
C
vasoconstriction
D
shivering
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25

The condition known as cretinism is caused by the deficiency of

A
adrenalin
B
vitamin A
C
insulin
D
thyroxin
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26

Which of the following parts of the mammalian brain is involved in taking the decision to run rather than
walk?

A
Cerebellum
B
Medulla oblongata
C
Cranial nerves
D
Mid brain
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27

The brain and spinal cord make up the

A
peripheral nervous system
B
automatic nervous system
C
central nervous-system
D
somatic nervous system
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28

Which of the following is not true about auxins? They

A
are manufactured by plants
B
are used in the site of production
C
are normally present in minute quantities in the cells of plants
D
regulate growth rate of plants
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29

Which of the following stimuli are not perceived through the skin of mammals?

A
Light
B
Pressure
C
Pain
D
Heat
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30

Which of the following parts of the' tongue does not correspond to the taste indicated against it?

A
Tip-sweet
B
Centre salt
C
Back-sour
D
Side-sour
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