Which of the following organisms is the most specialized ?
отговор
(D)
Rhizopus
4
Active transport can be defined as the movement of
отговор
(B)
substances from a region of low concentration to a region of high concentration across a living cell membrane
5
Which of the following cell inclusions can destroy other cell organelles?
отговор
(C)
Lysosome
6
In which of the following yam tissues will osmosis occur?
отговор
(B)
Raw and peeled
7
The following events occur during mitosis in a cell:
I. Chromatids separate;
II. Chromosomes become visible;
III. Chromosomes align at the equator
IV. Cytoplasm divides (Cytokinesis):
The correct sequence of the events is
отговор
(B)
ll, lll, l,lV
8
Which of the following statements about asexual reproduction is correct? It
отговор
(C)
always involves one parent and the offspring is genetically identical to the parent
9
Which of the following processes is not a function of the mammalian skin?
отговор
(D)
Gaseous exchange
10
The legs of an accident victim with a fractured vertebral column and injured spinal cord could not be raised because
отговор
(A)
impulses fromreceptors in the legs cannot travel to the brain
11
Which of the following conditions in flowering plants enhance self-pollination?
отговор
(A)
Cleistogamy
12
The inability to maintain proper balance of the body in humans may be due to a defect in the
отговор
(C)
Semi-circular canals
13
The following substances pass into the blood of the foetus from the mother's blood via the placenta except
отговор
(C)
viruses
14
An inferior ovary of a flower is situated
отговор
(A)
below the floral parts
15
Older parts of plant roots do not normally absorb water because
отговор
(D)
they lack root hairs
16
The amount of starch in a germinating seed decreases because the starch is used up
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(A)
for respiration and building up of cells
17
The purpose of treating poor soil with lime is to increase the quantity of
отговор
(A)
nitrogen
18
A meal consisting of yam and a lot of vegetables is not balanced because it does not contain
отговор
(B)
proteins
19
In a Biuret test , some protein was mixed with sodium hydroxide solution. Which of the following chemicals should be added to the mixture for a positive result?
отговор
(B)
copper sulphate
20
A characteristic feature of plant parasites is the
отговор
(D)
development of haustoria
21
The part of a leguminous plant where bacteria like Azotobacter can be found is
отговор
(C)
in the root nodules
22
The following habitats can be found in West Africa except
отговор
(D)
temperate grassland
23
The following adaptations are associated with the flight of birds except
отговор
(D)
clawed digits
24
The difference between a community and population is
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(B)
a community is made up of populations of living organisms while a populations is made up of organisms of the same secies
25
Which of the following statements about the circulation of water in nature is not correct? Water
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(C)
removed from ocean is permanently lost
26
The following organisms are consumers except
отговор
(B)
spirogyra
27
l. Fertilizer II. Insecticides III. Sewage IV. Crude oil V. Sulphur dioxide. The atmosphere can be polluted by
отговор
(D)
ll and lV only
28
Which of the following substances constitute domestic waste?
I Fertilizer II. Insecticides III. Sewage IV. Crude oil
V. Sulphur dioxide
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(B)
lll only
29
Which of the following natural resources is non-renewable?
отговор
(B)
Coal
30
Which of the following statement is not a reason for banning bush burning? It
отговор
(A)
allows for quick regrowth of grasses
31
Characteristics that exhibit continuous variation are generally controlled by
отговор
(D)
multiple genes
32
Differences in characteristics that exist among individuals of the same species is referred to as
отговор
(D)
variation
33
Which of the following traits is not a morphological variation in humans?
отговор
(A)
Ability to taste PTC
34
Which of the following statements about chromosomes is correct?
отговор
(B)
the bear number present in a species is constant
35
A small stem from a hibiscus plant was placed in a nutrieent medium, and it developed into a new plant. The new plant was reproduced
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(C)
asexually with the same genotype as the parent plant
36
The F1 generation of a cross between a red cock and white hen were all red because the gene for the
отговор
(B)
red colour was dominant
37
Which of the following diseases can be inherited?
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(C)
sickle cell anaemia
38
In dihybrid inheritance, Mendel considered
отговор
(B)
two pairs of contrasting characters
39
The main reason for nuptial flight in termites is to
отговор
(C)
form new colonies
40
Which of the following organisms is not a social insect?
