2009 - JAMB Biology Past Questions and Answers - page 3

21
In fresh water marshes and swamps, the most important abiotic factors that organisms have to adapt to is
A
nature of substratum
B
high salinity
C
high temperature
D
low pH
correct option: a
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22
Which of the following biomass could be characterized by very low rainfall,cold nights, hot days, and fast blooming plants?
A
northern guinea savanna
B
sounthern guinea savanna
C
tropical desert
D
montane forest
correct option: c
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23
Mass of crucible = 10g
Mass of crucible and soil before heating = 29g
Mass of a crucible and soil after heating = 18g
From the information above, determine the percentage of water in the given soil sample?
A
20%
B
25%
C
40%
D
50%
correct option: d
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24
I. Onchocerciasis
II. Schistosomiasis
III.Salmonellosis
IV. Meningitis
which of the diseases listed above are associated with water?
A
I and II only
B
II, III and IV
C
I, II and III
D
II and IV
correct option: c
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25
The major cause of global warning is the
A
burning of fossil fuel
B
construction of dams
C
use of electricity
D
exploration of space
correct option: a
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26
The uniqueness of an individual organism in a population is accounted for by
A
evolution
B
variation
C
adaptation
D
mutation
correct option: c
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27
A phenotypic character with intermediate forms that can be graded from one extreme to the other is referred to as
A
discontinuous variation
B
continuous variation
C
a mutant
D
a genome
correct option: b
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28
A farmer's assumption that the seed from a good harvest will produce a good yield is explained by the theory of
A
evolution
B
adaptation
C
variation
D
heredity
correct option: d
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29
In Mendelian inheritance, discontinuous characters are controlled by the
A
centromeres
B
alleles
C
chromosomes
D
chromatids
correct option: c
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30
A woman with the ability to roll her tongue (Tt) marries a man who cannot roll his tongue(tt). what is the probability of each of their children being a tongue roller?
A
100%
B
75%
C
50%
D
25%
correct option: c
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