1997 - JAMB Biology Past Questions and Answers - page 5
41
One of the most effective ways of controlling guinea worm is by
A
treating the disease
B
public enlightenment campaigns
C
accelerating rural developmnet
D
provision of portable drinking water
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42
During binary fission in lower organisms, the nucleus is known to undergo
A
mitosis
B
meiosis
C
fragmentation
D
mutation
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43
One reason for the success of Mendel's work is that the
A
was the first to carry out research work on modern genetics
B
introduced quantitative and qualitative elements into his work
C
selected two characteristics only at a time for study
D
drew up his laws of inheritance based on his knowledge of chromosomes
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44
The homozygous condition HbsHbsresults in sickle cell anaemia whereas HbAHbs has the sickling trait. What is the probability that a couple with the sickling trait will give birth to one normal child?
A
1/2
B
1/4
C
1/8
D
none
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45
Which of the following characters is NOT sex-linked?
A
Albinism
B
Baldness
C
Haemophilia
D
Colour blindness
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46
What combination of character should a prey develop to survive the environment of its predator?
A
Camouflag, well developed limbs and effective vision
B
Showy colour, big body and well developed limbs
C
Camouflage, big body and effective vision
D
Showy colour, well developed muscles and an acute sense of smell
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47
Fossil records found in sedimentary rocks offer some explanation for the theory of evolution because
A
the deposits have remains of organisms characteristic of when they were formed
B
different strata have remains of organisms of the same kind
C
only organisms with strong parts are fossilized
D
most animal and plant fossils bear little resemblance to present day living specimens
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48
Long neck in giraffe is used to illustrate the theory of
A
use and disuse
B
origin of species
C
origin of life
D
natural selection
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49
Water loss is regulated in plants and animals by both the
A
scales and the skin
B
scales and the hair
C
thick leaves and the feathers
D
leathery cuticle and the feathers
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