2008 - JAMB Biology Past Questions and Answers - page 3

21
The major consequences of bush burning in an ecosystem is
A
the loss of water
B
the loss of biological diversity
C
a decrease in animal population
D
an increase in soil fertility
correct option: b
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22
Which of the following associations is an example of mutualism
A
hydra viridis and zoochlorellae
B
human and lice
C
shark and remora fish
D
bread and rhizopus stolonifer
correct option: a
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23
In a typical freshwater habitat, the edge of the stream or pond constitutes the
A
tidal zone
B
intertidal zone
C
littoral zone
D
euphotic zone
correct option: c
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24
The main ecological problem facing intertidal organisms is
A
desiccation
B
floatation
C
salinity
D
humidity
correct option: b
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25
Stomata of some plants are sunken and protected by hairs. These are features of
A
mesophytes
B
epiphytes
C
hydrophytes
D
xerophytes
correct option: d
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26
An ecological factor that will have the most limiting effects on the abundance of phytoplankton in a turbid pond is
A
pH
B
oxygen
C
light
D
temperature
correct option: c
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27
In an experiment to determine the percentage of air in a soil sample, the following readings were recorded:

volume of water in measuring cylinder = 500 cm3

volume of soil added to water = 350 cm3

volume of water and soil after stirring = 800 cm3

the percentage of air in the soil sample is
A
6.25%
B
10.36%
C
14.28%
D
43.28%
correct option: a
volume of air in the soil = (350 + 500) - 800
= 850 - 800 = 50 cm3
% of air in the soil = (volume of air)/total volume x (100)/1 = (50)/800 x 100 = 6.25%
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28
A boy who is fond of swimming in a pond finds himself passing urine with traces of blood. He is likely to have contacted
A
schistosomiasis
B
onchocerciasis
C
poliomyelitis
D
salmonellosis
correct option: a
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29
The easiest way to establish the level of pollution in a local stream is to measure the level of
A
oxygen
B
carbon (IV) oxide
C
ammonia
D
alkalinity
correct option: a
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30
The Rhesus factor of blood was first identified in a category of
A
monkeys
B
human females
C
human males
D
chimpanzees
correct option: a
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