The scientist who introduced binomial nomenclature in the classification of organisms was
คำตอบ
(B)
Carolus Linnaeus
2
Which of the following statements is true about arthropods?
คำตอบ
(A)
Prothorax bears only legs
3
What level of organization is Spirogyra?
คำตอบ
(C)
Cell
4
The streaming movement of cytoplasm within the Paramecium is known as
คำตอบ
(C)
Cyclosis
5
Which of the following organelles is found only in plant cells?
คำตอบ
(D)
Plastids
6
Active transport differs from diffusion in that active transport
คำตอบ
(B)
allows the movement of substances against concentration gradient
7
The diagrams above are illustrations of an experimental set-up to demonstrate a type of tropic response in plants. The type of response demonstrated is
คำตอบ
(C)
hydrotropism
8
The conclusion drawn from the experiment in the diagram above is that
คำตอบ
(D)
roots of plants are positively hydrotropic
9
The odontoid process is found on the
คำตอบ
(A)
axis vetebra
10
A seedling was made to stand in a solution of red ink for three hours and a transverse section of the stem was examined under the microscope. The process being investigated was
คำตอบ
(C)
diffusion of colored substances
11
Which of the following structures would carry out cellular respiration? A
คำตอบ
(A)
germinating seed
12
Which of the following is NOT an excretory product of animals?
คำตอบ
(D)
oxygen
13
An example of homeostasis in living organisms is
คำตอบ
(D)
the release of phosphorus into the phloem of a plant growing in a phosphorus-deficient soil
14
Ultrafiltration in the kidney takes place in the
คำตอบ
(D)
Bowman's Capsule
15
The thyroid gland is found at the base of the
คำตอบ
(C)
Neck
16
Which of the following statements about the response of neurones to stimulus is correct?
คำตอบ
(D)
Intensity of stimulus must reach a threshold value before the neurons can be excited
17
Which of the following practices may lead to infection of the eye? Use of
คำตอบ
(A)
contact lenses
18
The structures for gaseous exchange in breathing roots are
คำตอบ
(B)
lenticels
19
The diagram above is an illustration of the life cycle of an insect. The adult fly in this cycle is called
คำตอบ
(B)
Butterfly
20
In the diagram above, the larva is also known as
คำตอบ
(B)
Caterpillar
21
The source of energy required by plants during food production is
คำตอบ
(C)
Sunlight
22
One major difference between plant and animals nutrition is the ability of plants to synthesize
คำตอบ
(A)
Food for plants and animals
23
By what process is starch converted into maltose?
คำตอบ
(A)
Hydrolysis
24
The ascent of water in tall trees is mainly due to
คำตอบ
(B)
transpiration pull
25
The duodenum of a person was surgically removed. Which of the following substances would have their digestion affected?
คำตอบ
(D)
starch, protein and lipids
26
Which of the following dental formulae represents the dentition in rabbits?
The diagram above is an illustration of an experimental set-up to demonstrate a property of soil. The property of soil demonstrated is
คำตอบ
(B)
capillarity
28
Which of the following statements would be a correct observation at the end of the experiment? Water moves
คำตอบ
(D)
highest in clayey soil
29
The most important factor(s) that influence(s) the ecological niche of an organism is/ are the
คำตอบ
(D)
competition for food and space
30
The diagram above is an illustration of organisms in an air-tight aquarium.The most important factor needed by the organisms is
คำตอบ
(A)
light energy
31
Which of the following instruments is used to determine the turbidity of water?
คำตอบ
(C)
secchi disc
32
In an ecosystem, the least efficient energy transfer link is from the
คำตอบ
(A)
secondary consumers to decomposers
33
Xerophytes have the following characteristics aimed at conserving water except
คำตอบ
(B)
broad leaf surfaces
34
An association between living organisms in which one lives on and feeds at the expense of the other is known as
คำตอบ
(C)
parasitism
35
When large numbers of organisms share limited space and resources, the immediate result is
คำตอบ
(C)
competition
36
Which of the following disease ic caused by a bacterium?
คำตอบ
(C)
syphilis
37
Conservation of wildlife is necessary mainly because
คำตอบ
(C)
it prevents extinction of species
38
Patients X and Y were likely transferred with blood of genotype
คำตอบ
(C)
BO
39
What should the hospital have done to prevent X from showing the symptom described above? Patient X should have
คำตอบ
(A)
undergone an agglutination test
40
The greatest contribution to genetic studies was made by
คำตอบ
(A)
Gregor Mendel
41
The exchange of genes between homologous chromosomes is called
คำตอบ
(A)
crossing over
42
The diagrams above are illustrations of the inheritance of coat colour in mice. J, K, L, M and N are parents. The cross between two parent mice gave rise to offspring P, Q, R and S. Which of the offspring are all homozygous?
คำตอบ
(C)
S
43
Genes that remain linked are those
คำตอบ
(A)
close to each other on the chromosomes
44
A plant cell has 14 chromosomes prior to mitosis. What is the number of chromosomes in the daughter cells?
คำตอบ
(A)
14
45
The chemical bond that holds the bases of the two strands of DNA together is
