2000 - JAMB Biology Past Questions and Answers - page 5
41
The pollutants that contribute to the depletion of the ozone layer in the atmosphere are
A
radioactive materials
B
oxides of sulphur
C
oxides of carbon
D
chlorofluorocarbons
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42
The surest way to combine the best qualities of both parents in the offspring is by
A
cross-breeding
B
inbreeding
C
selective breeding
D
pure breeding
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43
Blood grouping in human beings is derived from combinations of
A
two different alleles
B
four different alleles
C
three different alleles
D
two different genes
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44
The older fossil-bearing rocks, in contrast to the more recent ones, are more likely to contain
A
animal rather than plant remains
B
invertebrates rather than birds
C
flowering plants rather than mosses
D
reptiles rather than fishes
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45
In a group of male Agama lizards, the one with the brightest head colour is the
A
dominant
B
youngest
C
oldest
D
largest
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46
Example of water-borne and sex linked diseases are
A
taeniasis and malaria
B
cholera and gonorrhoea
C
typhoid and syphilis
D
dracunculiasis and haemophilia
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47
The mutation theory of organic evolution was propounded by
A
Gregor Mendel
B
Hugo de Vries
C
Jean Lamarck
D
Charles Darwin
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48
A certain savanna grasshopper changes colour from green during the rainy season to brown during the dry season and black after dry season bush fires. The reason for these colour changes is that the
A
grasshopper is getting older
B
environmental temperature is changing
C
grasshopper is avoiding predation
D
grasshopper is frequently moulting
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49
Complex social behaviour and organization are found mostly in
A
insects
B
birds
C
reptiles
D
mammals
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50
Which of the following structural features are adapted for uses other than water conservation?
A
Succulent stems
B
Scales in animals
C
Spines in plants
D
Feathers in birds
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