In a dicot leaf, guard cells differ from other epidermal cells because they
คำตอบ
(D)
contain chloroplast
3
Which of the following structure is NOT found in the female agama lizard?
คำตอบ
(E)
Nuchal crest
4
Herbs differ from shrubs because they
คำตอบ
(C)
do not become woody
5
If an organic compound has its hydrogen: oxygen ratio as 2:1, it is likely to be
คำตอบ
(B)
a cabohydrate
6
Which of the following elements are necessary for the formation of chlorophyll in a plant?
คำตอบ
(A)
magnesium and iron
7
Which of the following statements is NOT true of mammalian erythrocytes?
คำตอบ
(E)
They have nuclei at maturity
8
In woody plants, grass and water vapour are transported across the stems by the
คำตอบ
(A)
xylem fibres
9
Which of the following substance is not found in urine?
คำตอบ
(D)
Calcium chloride
10
The kidneys of all vertebrates act as osmoregulators. This means that they
คำตอบ
(B)
regulate osmotic processes
11
The movement of plant in response to external stimulus of no particular direction is
คำตอบ
(D)
nastic movement
12
The part of the mammalian brain responsible for maintaining balance is the
คำตอบ
(C)
cerebellum
13
In the onion bulb, food is stored in the
คำตอบ
(E)
leaf base
14
Groundnut is not really a 'nut' in the biological sense because
คำตอบ
(B)
pericarp is not hard and tough
15
What type of fruit is formed from a single flower having several carpels?
คำตอบ
(C)
Aggregrate fruit
16
28 g soil sample was heated to a constant weight of 24 g. When further heated to red hot and cooled, it weighed 18 g. What is the percentage of humus in the soil?
คำตอบ
(A)
22.2
17
Which of the following diseases is NOT caused by a virus?
คำตอบ
(B)
Maize rust
18
A centipede differs from a millipede by its
คำตอบ
(D)
poison claws
19
An organism having one pair of identical genes is
คำตอบ
(D)
a homozygote
20
Plants which can survive in places where the water supply is limited are
คำตอบ
(C)
xerophytes
21
Banana, plantain and pineapple can be grouped together because they
คำตอบ
(C)
produce suckers
22
One disease NOT caused directly by bacteria is
คำตอบ
(A)
malaria
23
In what order do the following structure develop during the metamorphosis of the toad? 1. External gills 2. Internal gills 3. Forelimbs 4.Hindlimbs 5. Mouth
คำตอบ
(B)
15243
24
The dental formula of a i(3/3); c(1/1); pm(4/4; m(2/3) = 42 represent that of a
คำตอบ
(D)
dog
25
Which of the following statements is NOT true of insectivorous plants?
คำตอบ
(B)
They attract insects simply because of pollination
26
which of these worms is beneficial to man?
คำตอบ
(D)
Earthworm
27
Starting from the skull end the vertebrate are arranged in the following order
คำตอบ
(D)
atlas, axis, cervical, thoracic and lumber
28
which of the following diseases could be exclusively associated with river basin?
คำตอบ
(C)
Onchocerciasis
29
Which of the following represents the evolutionary sequence in these plants? 1. Flowering plants 2. Ferns 3. Mosses 4. Algae 5. Conifers
คำตอบ
(E)
4 → 3 → 2 → 5 → 1
30
Which of the following statements on the mammalian circulatory system is NOT true?
คำตอบ
(A)
Blood in the pulimonary artery is richer in oxygen content than blood in the pulmonary vein
31
In a positive phototropic response of a coleoptile, the region of greatest curvature is brought about by the
คำตอบ
(D)
concentration of auxins in the region of curvature
32
The tuber cassava is NOT a stem tuber because it
คำตอบ
(D)
Lacks axillary buds
33
The function of the ossicles (malleus, incus and stapes) in the mammalian ear is
คำตอบ
(A)
Transmission of vibrations
34
Which of the following instruments is used for determining turbidity of water?
คำตอบ
(B)
secchi disc
35
Which of the following is NOT a characteristic of monocot plants?
คำตอบ
(A)
Occurrence of secondary thickening
36
Which sequence represents the correct order of organisms un a food chain? 1. Toad 2. Mucuna 3. Grasshopper 4. Snake 5. Hawk
คำตอบ
(E)
2 → 3 → 1 → 4 → 5
37
In rhizopus carbohydrate is stored in the form of
คำตอบ
(C)
Glycogen
38
Which of the following statements about the rate of transpiration is INCORRECT? It is
คำตอบ
(C)
Unaffected by humidity
39
‘Jointed skeleton’ is absent in the
คำตอบ
(D)
Snail
40
Which of the following statements about the dentition of man is INCORRECT ? man has
คำตอบ
(E)
A total of six molars
41
When spirogyra cell is immersed in a salt solution more concentrated than its cell sap, it
คำตอบ
(D)
Loses water and shrivels
42
Urea is produced in the
คำตอบ
(A)
Liver
43
What is the genetic ratio of the F2 generation if members of F generation are allowed to self-pollinate?
คำตอบ
(B)
3 tall : 1 short
44
The path taken by glucose from the ileum to the heart is
