2007 - WAEC Biology Past Questions and Answers - page 3
21
A neurone that transmits impulses directly from sensory cells is called
A
an afferent neurone
B
an efferent neurone
C
a relay neurone
D
a peripheral neurone
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22
Protection of the body cells of mammals against ultra-violet rays of the sun is brought about by
A
keratin
B
melanin
C
sebum
D
scales
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23
In which of the following organisms is parental care manifested?
A
Tilapia
B
Toad
C
Cockroach
D
Snail
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24
The site for production of a ATP in a cell is
A
ribosome
B
cytoplasm
C
Golgi body
D
mitochondrion
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25
In testing for starch in a leaf, the leaf is boiled in alcohol to
A
kill the cells
B
soften the leaf
C
enable chemicals penetrate the leaf
D
decolourise the leaf
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26
The mode of nutrition common to green plants is
A
autotrophic
B
heterotrophic
C
holozoic
D
saprophytic
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27
Micronutrients essential for the synthesis of chlorophyll include
A
iron and potassium
B
iron and magnesium
C
magnesium and calcium
D
magnesium and potassium
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28
Biuret’s test is carried out on a food substance to indicate the presence of
A
vitamins B
B
fats
C
proteins
D
starch
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29
In a test for non-reducing sugars like sucrose, what is the significance of adding dilute hydrochloric acid to the original sugar solution? To
A
hydrolyse the non-reducing sugar
B
accelerate he rate of the reaction
C
stabilize the medium
D
sterilize the solution
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30
'The colour that is associated with a positive iodine test is
A
brown
B
red
C
blue-black
D
yellow
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