2005 - WAEC Biology Past Questions and Answers - page 5
41
In an ecosystem the organism which changes light energy into stored chemical energy is the
A
consumer
B
decomposer
C
producer
D
carnivore
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42
Which of the following processes does not contribute to the maintenance of the nitrogen content of the soil?
A
Decomposition
B
Denitrification
C
Nitrification
D
Nitrogen fixation
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43
Which of the following organisms is well adapted for fluid feeding?
A
Cockroach
B
Mosquito
C
Grasshopper
D
Ants
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44
The density-dependent factors that operate to regulate a population size may include the following except
A
shortage of food supply
B
fire outbreak
C
spread of diseases
D
increased competition
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45
Which of the following infections is unlikely to respond to antibiotic treatment?
A
Typhoid fever
B
Ring worm
C
Measles
D
Tetanus
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46
Algal bloom depletes oxygen content of bodies of water polluted by
A
industrial effluents
B
thermal plant discharge
C
raw sewage disposal
D
crude oil spillage
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47
Conservation of wild life is necessary mainly because
A
wild species cannot resist disease better than their domesticated species
B
many predator wild animals help in control of pests
C
many people derive pleasure from observing wild animals
D
it helps to prevent extinction of species
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48
Which of the following is not a means of conservation?
A
Controlling excessive deforestation
B
Prevention of poaching
C
Replacing harvested mature trees with seedlings
D
Burning of vegetation before cropping
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49
Which of the following statements about mutation is true?
A
The genotype is not affected
B
The genotype is affected
C
The phenotype is not affected
D
It cannot be induced by artificial means
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50
Variation which exhibits a wide range from one extreme to the other with very little difference between the intermediates is described as
A
phenotypic
B
discontinuous
C
continuous
D
genotypic
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