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