Which of the following will cause wilting in plants?
отговор
(D)
Excessive transpiration
8
Which of the following definitions best describes excretion? The
отговор
(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
отговор
(D)
IV, I, II and III
10
The following are methods of measuring plant growth except
отговор
(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?
отговор
(D)
Synovial fluid.
12
Diffusion is most effective in living organisms, when the surface area is
отговор
(C)
large while the thickness is small
13
The function of the red blood cells is to
отговор
(C)
transport oxygen to the cells
14
Which of the following is used to measure the rate of water uptake in plants?
отговор
(A)
Potometer
15
Which of the following does not occur during inhalation in mammals?
отговор
(B)
Diaphragm contracts and becomes dome shaped
16
The oxygen released during photosynthesis is obtained
отговор
(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?
отговор
(A)
Filtration
18
Adrenalin is considered as a hormone for “fright and flight” because it
отговор
(D)
prepares the body for action.
19
Which of the following organs in humans is responsible for the removal of excess water?
отговор
(B)
The kidney
20
In humans, which of the following pairs of hormones correspond to male and female respectively?
отговор
(C)
Testosterone and oestrogen
21
If the cerebellum of a person is slightly damaged, which of the following will be impaired?
отговор
(B)
Walking
22
The structure of the ear that is responsible for balancing is the
отговор
(A)
semi-circular carnals
23
When a person moves from a darkroom into bright light, the pupil becomes
отговор
(D)
smaller
24
Which of the following is not an example of entomophilous flower?
отговор
(C)
Guinea grass
25
In flowering plants, fertilization would occur when
отговор
(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
отговор
(D)
embryo
27
Which of the following substances is contained in chloroplasts?
отговор
(D)
Dextrin
28
The structures labelled II are
отговор
(D)
root nodules
29
The structures labelled II are associated with
отговор
(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?
отговор
(B)
Brown → blue → brick red → clear
31
Ecology simply means the study of
отговор
(B)
interrelationship between organisms and their environment
32
Which of the following processes removes water from the water cycle?
отговор
(D)
Transpiration
33
The importance of practising crop-rotation in agriculture is to
отговор
(B)
maintain the fertility of the soil
34
In any food chain, the first member must be a
отговор
(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?
отговор
(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
отговор
(C)
producer
37
Which of the following terms ensures the survival of an organism in its environment?
отговор
(C)
Adaptation
38
The concave shape of a birds wing during flight, ensures that the greater air pressure under the wings will
отговор
(A)
counteract the effect of gravity
39
The possession of breathing roots is a characteristic of plants growing in
отговор
(A)
mangrove swamp
40
The numbers in a population would rise, if there was an increase in the
отговор
(D)
amount of food available
41
Measles in infants can be prevented by
отговор
(D)
vaccinating young children
42
Micro-organisms are important in recycling nutrients because
отговор
(C)
they break down dead organic materials
43
A vegetable farmer will benefit from a cattle rearer if
отговор
(A)
the faecal remains of the cattle are made available to the farmer
44
Wildlife conservation is enhanced by
отговор
(B)
discouraging elimination of endangered species
45
Which of these statements is true about fingerprint patterns?
отговор
(A)
Consistent for a lifetime
46
Some species of animals and plants are considered as endangered, because
отговор
(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?
отговор
(C)
Height
48
Which of the following statements about blood groups in human is not correct?
отговор
(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?
отговор
(C)
1 : 3
50
Which of the following is not a morphological variation in human beings?
отговор
(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
отговор
(D)
mutation
52
In humans, sex is determined by
отговор
(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?
отговор
(B)
25%
54
The genes affecting the same trait and are located at the same position on the homologous chromosomes
are called
отговор
(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
