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