Which of the following will cause wilting in plants?
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(D)
Excessive transpiration
8
Which of the following definitions best describes excretion? The
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(D)
removal of the waste products of metabolism.
9
Study the information below. Use it to answer question below
In an experiment to study the rate of water loss in plants, leaves of a potted plant were treated as follows:
I. Upper surface covered with Vaseline ll. Lower surface covered with Vaseline
III. Both surfaces covered with Vaseline IV. None of the leaf surfaces covered
Indicate in a descending order, the rate of water loss from the leaves
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(D)
IV, I, II and III
10
The following are methods of measuring plant growth except
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(B)
counting the number of fruits produced
11
Which of the following will ease the friction between the ends of bones in a movable joint?
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(D)
Synovial fluid.
12
Diffusion is most effective in living organisms, when the surface area is
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(C)
large while the thickness is small
13
The function of the red blood cells is to
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(C)
transport oxygen to the cells
14
Which of the following is used to measure the rate of water uptake in plants?
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(A)
Potometer
15
Which of the following does not occur during inhalation in mammals?
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(B)
Diaphragm contracts and becomes dome shaped
16
The oxygen released during photosynthesis is obtained
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(C)
during the photolysis of water using energy trapped in chlorophyll
17
In which of the following processes in mammals is liquid passed from blood capillaries to Bowman‘s capsule?
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(A)
Filtration
18
Adrenalin is considered as a hormone for “fright and flight” because it
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(D)
prepares the body for action.
19
Which of the following organs in humans is responsible for the removal of excess water?
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(B)
The kidney
20
In humans, which of the following pairs of hormones correspond to male and female respectively?
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(C)
Testosterone and oestrogen
21
If the cerebellum of a person is slightly damaged, which of the following will be impaired?
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(B)
Walking
22
The structure of the ear that is responsible for balancing is the
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(A)
semi-circular carnals
23
When a person moves from a darkroom into bright light, the pupil becomes
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(D)
smaller
24
Which of the following is not an example of entomophilous flower?
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(C)
Guinea grass
25
In flowering plants, fertilization would occur when
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(C)
one of the nuclei inside the pollen tube fuses with the ovum
26
After fertilization in the flowering plants, the zygote develops into the
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(D)
embryo
27
Which of the following substances is contained in chloroplasts?
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(D)
Dextrin
28
The structures labelled II are
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(D)
root nodules
29
The structures labelled II are associated with
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(C)
nitrogen-fixing bacteria
30
Using iodine solution, Biuret test, Benedict reagents and ethanol, respectively in testing for reducing
sugars, which of the following trends of colour changes would be observed?
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(B)
Brown → blue → brick red → clear
31
Ecology simply means the study of
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(B)
interrelationship between organisms and their environment
32
Which of the following processes removes water from the water cycle?
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(D)
Transpiration
33
The importance of practising crop-rotation in agriculture is to
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(B)
maintain the fertility of the soil
34
In any food chain, the first member must be a
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(D)
autotroph
35
Which of the following measures is most likely to cause a damage to the ecosystem in the control of pests
and weeds?
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(D)
Spraying insecticides to destroy cotton- stainers in a cotton-field
36
The total amount of energy entering a food chain is that which is present in the
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(C)
producer
37
Which of the following terms ensures the survival of an organism in its environment?
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(C)
Adaptation
38
The concave shape of a birds wing during flight, ensures that the greater air pressure under the wings will
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(A)
counteract the effect of gravity
39
The possession of breathing roots is a characteristic of plants growing in
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(A)
mangrove swamp
40
The numbers in a population would rise, if there was an increase in the
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(D)
amount of food available
41
Measles in infants can be prevented by
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(D)
vaccinating young children
42
Micro-organisms are important in recycling nutrients because
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(C)
they break down dead organic materials
43
A vegetable farmer will benefit from a cattle rearer if
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(A)
the faecal remains of the cattle are made available to the farmer
44
Wildlife conservation is enhanced by
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(B)
discouraging elimination of endangered species
45
Which of these statements is true about fingerprint patterns?
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(A)
Consistent for a lifetime
46
Some species of animals and plants are considered as endangered, because
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(C)
their populations have become so small that they may soon die out
47
Which of the following is a continuous variation, in human population?
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(C)
Height
48
Which of the following statements about blood groups in human is not correct?
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(C)
People with blood group O can receive blood from all other groups
49
When Mendel crossed round seeds with wrinkled seeds of Pea Plant, what was the ratio of wrinkled seeds
to round seeds in the F2 plants?
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(C)
1 : 3
50
Which of the following is not a morphological variation in human beings?
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(B)
Blood groups
51
The name given to a sudden change in a gene or chromosome that can be passed on to the offspring is
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(D)
mutation
52
In humans, sex is determined by
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(D)
the differences in the nature of the X and Y chromosomes in the male.
53
A man with heterozygous genotype for blood group B marries a woman with heterozygous A, what percentage
(%) of their children would be universal donor?
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(B)
25%
54
The genes affecting the same trait and are located at the same position on the homologous chromosomes
are called
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(B)
alleles
55
Which of the following is an adaptation by plants to reduce the rate of water loss in a dry habitat? Possession of
