1991 - JAMB Biology Past Questions and Answers - page 4
31
Epigeal germination can be found in
A
sorghum
B
maize
C
millet
D
groundnut
32
A dwarf plant can be stimulated to grow to normal height by the application of
A
thyroxin
B
gibberellin
C
insulin
D
kinin
33
The greatest contribution to genetic studies was made by
A
Thomas Morgan
B
Gregor Mendel
C
Charles Darwin
D
Robert Hooke
34
The exchange of genes between homologous chromosomes is called
A
test cross
B
back cross
C
crossing-over
D
mutation
35
When two heterozygotes mate, the dominant trait will appear in
A
the F1 generation only
B
the F2 generation only
C
both the F1 and F2 generations
D
neither the F1 nor F2 generation
36
Which of the following characters is NOT sex-linked?
A
River blindness
B
Baldness
C
Haemophilia
D
Colour blindness
37
The most important factors which influence an organism's way of life in its habitat are
A
the physicals and biotic enviroment
B
Food and water availability
C
temperature, water, light and predator-prey relationship
D
competition for food and spaces
38
Organisms in an ecosystem are usually grouped according to their trophic level as
A
carnivores and epiphytes
B
consumers and parasites
C
producers and consumers
D
producers and saprophytes
39
A
The population of I was higher than II at the beginning of the experiments
B
II was wiped out from the enviroment at the end of the experiments
C
The population of II was always lower than that of
D
The population of I was lower at the end of the experiment than at the beginning
40
A food web is more stable than a food chain because
A
it contains more organisms
B
it has greater energy source
C
it is not easy to destroy
D
every organism has an alternative source
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