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