2011 - WAEC Biology Past Questions and Answers - page 5
41
The falling off of leaves of deciduous trees is helpful to the plant because it
A
reduces the rate of transpiration
B
enables the plant to conveniently eliminate its excretory products
C
enables the plant to bear more fruits
D
ensures that the limited mineral salts get to only growing regions
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42
A sample of wet garden soil of known weigh was heated to constant weight. The loss of weight is due to loss of
A
water
B
organic matter
C
water and organic matter
D
water and inorganic matter
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43
Assuming that a period of stable population size is followed by a period when natality increases by ten (1O) per cent and immigration increases by twenty (20) percent of population size. The population size will
A
be at equilibrium
B
increase by forty (40) per cent
C
begin to increase
D
begin to decrease
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44
Which of the following methods does not make water fit for drinking?
A
Addition of chlorine
B
Boiling
C
Distillation
D
Addition of alum
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45
Vaccination results in
A
aiding red blood cells to carry more oxygen
B
production of antibodies which destroy toxins of germs
C
arresting excessive bleeding
D
production of white blood cells which engulf and digest bacteria.
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46
Leguminous crops are incorporated into crop rotation in order to
A
improve aeration of the soil.
B
promote nitrogen fixation
C
increase the rate of soil formation
D
improve upon the water holding capacity of the soil
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47
Which of the following practices improves crop yield in a clayey soil? Addition of
A
more water and humus
B
lime and humus
C
fertilizers
D
weedicides and fertilizers
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48
Which of the following activities promotes forest conservation?
A
Lumbering
B
Use of firewood for cooking
C
Afforestation
D
Production of paper
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49
Which of the following statements is not true about continuous variation? It
A
is usually controlled by several genes
B
can be influenced by environmental factors
C
follows a normal distribution curve
D
is usually controlled by one or two pair(s) of genes
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50
Acquired characters are
A
received from parents
B
passed to offspring
C
caused by the environment
D
caused by mutation
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