2008 - WAEC Biology Past Questions and Answers - page 5
41
Many diseases caused by bacteria can be treated and cured by using
A
antiseptics
B
antibiotics
C
antigens
D
antibodies
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42
To avoid over fishing in a lake, the following measures may be helpful except
A
limiting fishing periods
B
regulating the size of nets
C
fishing throughout the year
D
fish breeding exercise
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43
Conservation may be promote by
A
encouraging tree planting
B
systematic deforestation
C
overgrazing of pastures
D
unabated bush timing
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44
Which of the following substances is not recycled in an ecosystem?
A
Carbon
B
Energy
C
Water
D
Nitrogen
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45
Which of the following statements about phenylthiocarbamide (PTC) is not correct?
A
Some people BHG the taste of PTC to be bitter
B
Others find this substance to be tasteless
C
Ability to taste this chemical is inheritable
D
Ability to taste the chemical is hot inheritable
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46
Which of the following characters is not an example of discontinuous variation?
A
Skin color
B
Fingerprint
C
Ability to roll tongue
D
Sex type
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47
Which of the following human traits in a class of school children may give an approximate normal distribution curve when the variation is plotted?
A
Blood groups
B
Ear shapes
C
Sex distribution
D
Heights
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48
The observable characteristics of an individual usually resulting from the interaction between the gene composition and the environment is referred to as
A
allele
B
genotype
C
phenotype
D
chromosome
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49
The sudden change in a gene structure or chromosome number in an organism likely to cause an inheritable change in the phenotype is known as
A
migration
B
mutation
C
mitosis
D
meiosis
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50
The effective cells involved in sickle-cell anaemia disease are
A
phagocytes
B
lymphocytes
C
erythrocytes
D
thrombocytes
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