An association between the root nodule of a leguminous plant and rhizobium sp, is known as
คำตอบ
(D)
symbiosis
2
Amphibians are normally found
คำตอบ
(B)
in water and on moist land
3
Viviparity occurs mainly in the
คำตอบ
(A)
mammals
4
The jointed structure in insects that bears organs which are sensitive to touch, smell and vibration is the
คำตอบ
(C)
antenna
5
Which of following groups is the most advanced?
คำตอบ
(D)
Gymnosperm
6
Most monocots are easily recognized by their
คำตอบ
(B)
long and sword-like leaves
7
Water fleas, wood lice and barnacles belong to the group?
คำตอบ
(B)
crustacea
8
The mode of feeding in Amoeba and Hydra is
คำตอบ
(A)
heterotrophic
9
Which of the following organisms does not exist as a single free living cell?
คำตอบ
(B)
Mold
10
The center for learning and memory in the human brain is the
คำตอบ
(C)
cerebrum
11
Urea formation occurs in the
คำตอบ
(B)
liver
12
The structure that holds the yolk in position is labelled
คำตอบ
(D)
III
13
The part labelled IV is the
คำตอบ
(B)
germinal disc
14
The gas produced during tissue respiration can be identified by using
คำตอบ
(A)
calcium hydroxide
15
A seedling grown in the dark is likely to be
คำตอบ
(A)
etiolated
16
The enzyme invertase will hydrolyze sucrose to give
คำตอบ
(C)
glucose and fructose
17
When yeast respire anaerobically, it converts simple sugar to carbon (IV) oxide and
คำตอบ
(C)
alcohol
18
The transportation of oxygen and carbon (IV) oxide in mammals is carried out by
คำตอบ
(D)
erythrocytes
19
The veins of the leaf are formed by the
คำตอบ
(A)
vascular bundles
20
The parts which function together to bring about hearing are labelled
คำตอบ
(C)
I, II, III and IV
21
The part labelled II is the
คำตอบ
(D)
ear ossicles
22
When specimen X is mixed with few drops of iodine solution, the appearance of a blue-black colour confirms that X is
คำตอบ
(B)
starch
23
The structure above represents a
คำตอบ
(D)
cervical vertebra
24
Blood vessel usually pass through the structure labelled
คำตอบ
(C)
V
25
Salts and water are absorbed in the roots and transported to leaves by
คำตอบ
(D)
osmosis through the xylem tissues
26
The number of plants species obtained from a population study of a garden is as follows: Guinea grass (15), Ipomea spp (5), sida spp (7) and Imperata spp (23). What is the percentage of occurrence of Imperata spp?
คำตอบ
(C)
46%
27
Carbon (IV) oxide content of the atmosphere is least affected by
คำตอบ
(A)
cutting down and clearing of forests
28
The factor that least affects food shortages in sub-saharan Africa is
คำตอบ
(C)
mixed-cropping
29
The epiphytic habitat can best be described as
คำตอบ
(A)
arboreal
30
The highest percentage of energy in an ecosystem occurs at the level of the
คำตอบ
(C)
producers
31
The greatest influence on a stable ecosystem in nature is exerted by
คำตอบ
(A)
man
32
The physical space occupied by an organism together with its functional role in community can be described as
คำตอบ
(C)
niche
33
A freshwater pond may contain
คำตอบ
(C)
water lily, fish, water scorpion and dragon larva
34
The hygrometer is used for measuring
คำตอบ
(A)
relative humudity
35
The distribution of plants in a rain forest is governed mainly by
คำตอบ
(D)
rainfall pattern
36
Both recessive and dominant characters are found
คำตอบ
(B)
at the same locus of a homologous chromosome
37
The probability of a baby being a boy or a girl depends on the contribution of the
คำตอบ
(A)
father's sex cell
38
Which of the following statements is true of blood groups and blood transfusion?
คำตอบ
(C)
Group AB is the universal recipient
39
Which of the following is likely to encourage inbreeding in plants?
คำตอบ
(C)
Monoecious
40
A tall plants crossed with a dwarf one produces offspring of which half are tall and half are dwarf. What are the genotypes of the parents?
คำตอบ
(B)
Tt, tt
41
In man, the ability to roll the tongue is a variation classified as
คำตอบ
(B)
physiological
42
Darwin is considered the first scientist who correctly explained the theory of
คำตอบ
(D)
organic evolution
43
The stem of a typical aquatic plant usually has many
คำตอบ
(A)
air cavities
44
The role of the male adult honey bee is to
คำตอบ
(C)
mate with the queen
45
The ability of an organism to live successfully in an environment is known as
