In the binomial system of naming organisms, the second name is called the
คำตอบ
(D)
specific name
2
Which of the following features does not necessarily place paramecium as a higher level of organisation over Amoeba?
คำตอบ
(A)
Presence of cilia
3
The living materials of the cell consist of
คำตอบ
(A)
nucleus and cytoplasm
4
A pupil accidentally "watered" a potted plant with concentrated salt solution after sometime the plant began to wilt.
The wilting of the plant is due to the fact that
คำตอบ
(C)
the salt solution has caused water lost from the plant cell leading to loss of turgor
5
A pupil accidentally "watered" a potted plant with a concentrated salt solution. After sometime the plant began to wilt.
Which of the following activities would revive the plant?
คำตอบ
(D)
Adding more water to the soil
6
Primary growth in plants is brought about by the activity of the
คำตอบ
(A)
meristem
7
To form a ball and socket joint, the structure labeled I fits into another structure in the scapula
called the
คำตอบ
(B)
glenoid cavity
8
The structure labelled II is called
คำตอบ
(C)
shaft
9
Which of the following parts of the skeleton does not have a protective function?
คำตอบ
(B)
Carpals
10
Carbon dioxide is carried in the plasma?
คำตอบ
(A)
in combination with haemoglobin
11
In the adult frog gaseous exchange takes place in the
คำตอบ
(A)
buccal cavity, skin and lungs
12
The process of regulating the amount of water and solutes in the body fluids is called
คำตอบ
(C)
osmoregulation
13
The presence of glucose in the urine of a patent is an indication of malfunctioning of the
คำตอบ
(A)
pancreas
14
Which of the following statements is not true about hormones?
คำตอบ
(D)
Once the effects of hormones are over, they are inactivated and excreted from the body
15
Which of the following actions is note function of adrenaline? It increases
คำตอบ
(B)
muscular power and resistance to fatigue
16
Plant hormones include the following except
คำตอบ
(A)
insulin
17
The passage of nerve impulse across a synapse is facilitated by the secretion of
คำตอบ
(A)
acetylcholine
18
The part of the brain which controls and coordinates body posture is the
คำตอบ
(A)
cerebellum
19
Which of the following processes is not an example of a reflex ac ion?
คำตอบ
(B)
Reading
20
The eyes can properly focus images of objects of various distances on the retina by a process called
คำตอบ
(C)
accommodation
21
The process by which flowers produce fruit without the process of fertilization is called
คำตอบ
(B)
parthenocarpy
22
The part of the young root that pushes its way through the soil is the
คำตอบ
(C)
root cap
23
An example of a dehiscent fruit is
คำตอบ
(A)
crotolaria
24
Which of the following food substances gives the least amount of calories?
คำตอบ
(C)
cabbage
25
Analysis of the gut content of an animal showed that it contained small pieces of bone, seeds. roughages and insects. The animal is likely to be a/an.
คำตอบ
(D)
omnivore
26
Filaments of Spirogyra placed in a beaker of water in a dark cupboard died because
คำตอบ
(A)
the filaments could not photosynthesize
27
The impedance of the concentration of chloroplast in the palisade layer of the leaf is for maximum exposure to
คำตอบ
(B)
light
28
A community is best described as
คำตอบ
(C)
populations of different species living together and interacting with each other in one habitat
29
Which of the following physical actors is likely to affect the distribution of plants in a pond?
คำตอบ
(A)
light
30
Which of the following instruments is used to measure wind speed?
คำตอบ
(D)
Anemometer
31
Tertiary consumers within the web are
คำตอบ
(A)
cat and lion only
32
What would be the effect of taking the lion out of the web?
คำตอบ
(B)
Man would occupy the apex of the web
33
Which of the following statements about the transfer of energy in the ecosystem is correct?
คำตอบ
(D)
Energy is lost at each trophic level
34
Pond weeds normally lack thick layers of cuticle because
คำตอบ
(B)
there is no danger of becoming desiccated
35
Shrubs do not survive on newly weathered soils because
คำตอบ
(A)
the top soil is shallow
36
The speed of the flow of water in a river is faster in the middle than along the banks due to
คำตอบ
(D)
resistance offered by the wall of the banks.
37
The effects of environmental degradation caused by human activities can be controlled by the following measures except
คำตอบ
(C)
resettling indigenous inhabitants
38
The following observations concerning succession are true except that the
คำตอบ
(C)
max community has the greatest number of species
39
A vaccine is introduced into a person‘s body to
คำตอบ
(B)
stimulate the body to produce antibodies
40
Which of the following activities constitutes biological control?
คำตอบ
(C)
Tilapia feeding on the larvae and pupae of mosquito
41
Many diseases caused by bacteria can be treated and cured by using
คำตอบ
(B)
antibiotics
42
To avoid over fishing in a lake, the following measures may be helpful except
คำตอบ
(C)
fishing throughout the year
43
Conservation may be promote by
คำตอบ
(A)
encouraging tree planting
44
Which of the following substances is not recycled in an ecosystem?
คำตอบ
(B)
Energy
45
Which of the following statements about phenylthiocarbamide (PTC) is not correct?
คำตอบ
(D)
Ability to taste the chemical is hot inheritable
46
Which of the following characters is not an example of discontinuous variation?
คำตอบ
(A)
Skin color
47
Which of the following human traits in a class of school children may give an approximate normal distribution curve when the variation is plotted?
คำตอบ
(D)
Heights
48
The observable characteristics of an individual usually resulting from the interaction between the gene composition and the environment is referred to as
คำตอบ
(C)
phenotype
49
The sudden change in a gene structure or chromosome number in an organism likely to cause an inheritable change in the phenotype is known as
คำตอบ
(B)
mutation
50
The effective cells involved in sickle-cell anaemia disease are
คำตอบ
(C)
erythrocytes
51
What does the chemical composition of the genetic material of all living organisms consist of?
คำตอบ
(A)
Deoxyribonucleic acid
52
What of the following occurrences is not a feature of meiosis?
คำตอบ
(D)
Formation of two diploid cell
53
Which of the following diseases is commonly observed in human males and is sex-linked?
คำตอบ
(D)
colour blindness
54
The resemblance of a palatable insect to a poisonous insect is an example of
คำตอบ
(C)
an escape from the predator by mimicry
55
If red is dominant to white and homozygous red pea-plants are crossed with homozygous white pea-plants, the first filial generation will have
