WAEC - Biology (2007)

1
A change in the environment of an organism is termed
回答
(D)
stimulus
2
Organisms that interbreed to produce fertile offspring belong to the same
回答
(C)
species
3
The transfer of ripe pollen grains from the anther to the stigma of the same flower is termed
回答
(B)
self-pollination
4
The hereditary material in a living organism is located inside the
回答
(C)
nucleus
5
Respiration is an essential life process providing the living cells with
回答
(C)
energy
6
The organelle involved in the transport of substances within a cell is?
回答
(A)
Golgi body
7
Which of the following processes takes place when a plant cell is put in a hypotonic solution?
回答
(C)
Water moves into the cell and the cell becomes turgid
8
The dominant stage in the life cycle of a fern is the
回答
(D)
sporophyte
9
Yeast is added to the dough during the preparation of bread because it produces
回答
(C)
carbon dioxide
10
Growth includes the following processes except
回答
(D)
meiosis
11
Which of the following processes is a form of sexual reproduction?
回答
(B)
Conjugation in Spirogyra
12
The fine adjustment of the light microscope is used to
回答
(C)
focus the object under high power
13
Which of these statements about white blood cells is true? They
回答
(D)
are large nucleated cells
14
Which of the following blood vessels have valves?
回答
(C)
Vein
15
The malplghian body of the mammalian kidney is made up of
回答
(C)
glomerulus and Bowman's capsule
16
The persistent Presence of glucose in a person’s urine indicates malfunctioning of the
回答
(C)
pancreas
17
The endocrine gland which co-ordinates the action of other glands and is also associated with the nervous system is the
回答
(C)
pituitary gland
18
Insulin is produced by the
回答
(D)
pancreas
19
Which of the following statements about nerve cells is not correct?
回答
(B)
The cell body is always found at the end of the neurone
20
The smallest branches on the cell body of a neurone are called
回答
(A)
dendrites
21
A neurone that transmits impulses directly from sensory cells is called
回答
(A)
an afferent neurone
22
Protection of the body cells of mammals against ultra-violet rays of the sun is brought about by
回答
(B)
melanin
23
In which of the following organisms is parental care manifested?
回答
(A)
Tilapia
24
The site for production of a ATP in a cell is
回答
(D)
mitochondrion
25
In testing for starch in a leaf, the leaf is boiled in alcohol to
回答
(D)
decolourise the leaf
26
The mode of nutrition common to green plants is
回答
(A)
autotrophic
27
Micronutrients essential for the synthesis of chlorophyll include
回答
(B)
iron and magnesium
28
Biuret’s test is carried out on a food substance to indicate the presence of
回答
(C)
proteins
29
In a test for non-reducing sugars like sucrose, what is the significance of adding dilute hydrochloric acid to the original sugar solution? To
回答
(A)
hydrolyse the non-reducing sugar
30
'The colour that is associated with a positive iodine test is
回答
(C)
blue-black
31
Enzymes can be inactivated by certain chemical substances in the body called
回答
(B)
inhibitors
32
Use the following equations to answer the question below
I - Boiled saliva + starch → X
II - Fresh saliva + starch → Y

What substances do X and Y represent?
回答
(B)
X = Starch and Y = Maltose
33
Which of the following enzymes is not one of the main classes of enzymes?
回答
(A)
Sucrase
34
Which of the following enzymes does not belong to proteases?
回答
(A)
Sucrase
35
Which of the following protozoans feeds parasitically
回答
(C)
Plasmodium
36
Which of the following features of the tadpole indicates that the animal is herbivorous? Possession of
回答
(C)
long coiled intestine
37
The term community is defined as
回答
(A)
the different groups of plants and animals in the same area and interacting with each other
38
Which of the following organisms are the producers in an aquatic habitat?
回答
(B)
Phytoplanktons
39
Wind speed is measured with
回答
(D)
an anemometer
40
The amount of energy passed from one trophic level to the next decreases because
回答
(C)
more energy is conserved at lower trophic levels
41
Which of these values in kj/m2 likely represents the energy content of the producers in a habitat?
回答
(A)
5033
42
The major pollutant around airport residential areas is
回答
(C)
noise
43
The effect of chlorofluorocarbon is
回答
(B)
depletion of the ozone layer
44
The order of primary succession by plants in a very dry habitat is?
回答
(C)
mesophytes → shrub -> xerophytes
45
A population which exceeds its carrying capacity and then collapses is represented graphically as a?
回答
(C)
s-shape curve
46
Which of the following infections would not respond to an antibiotic treatment?
回答
(B)
Measles
47
The vector of the sleeping sickness disease parasite is the
回答
(D)
tse-tse fly
48
Which of the following bacteria lives in the root nodules of leguminous plants?
回答
(C)
Rhizobium
49
Endangered species are organisms that ought to be
回答
(D)
protected
50
Which of the following substances is not a conservable natural resource?
回答
(B)
fire
51
Which of the following actions do not reflect the objectives of conservation of natural resources?
回答
(C)
Elimination of some wild animals to enable others survive
52
Which of the following forms of variation will give a normal distribution?
回答
(C)
Body weight
53
Two tall plants were crossed; some of their offsprings were tall and others short the possible genotypes of the parent plants were
回答
(C)
Tt and Tt
54
The character that is manifested in an organism in the presence of a contrasting character is known as
回答
(D)
dominant
55
What is the probability of producing a child of blood group O by a woman of blood group O and a man of blood group A?
回答
(A)
25%