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