The group mollusca is characterized by the presence of
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(D)
Soft, non-segmented
3
A virus can sometimes be regarded as a living organism because it
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(C)
reproduces in living cells
4
A mayor difference between plants and animals is that
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(A)
there is free movement in animals while this is limited in plants
5
Which of the following adaptation is no found in fruits and seeds dispersed by the win '?
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(B)
Spongy coats
6
The main similarity between unicellular and multicellular organisms is that both
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(A)
perform all life activities
7
One important characteristic of green plants is that they
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(C)
are autotrophic
8
A serious disadvantage of complexity in higher organisms is
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(A)
a high demand for food and energy
9
Which of these organs can be considered vestigial in humans but functional in other mammals? The
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(B)
appendix
10
Which of the following pairs of organisms are photosynthetic?
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(C)
Chlamydomonas and Euglena
11
Which of the following pairs of organisms exist as colonies?
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(B)
Pandorina and Volvox
12
Which of the following Best explains why It is difficult to see clearly in dim light?
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(C)
Too little light reaches the retina and so the cones may not be stimulated at all
13
In active transport, molecules move against a concentration gradient, therefore
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(A)
molecules move from a region of low concentration to a region of high concentration
14
Which of the following substance pass through the root cell membrane by osmosis?
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(D)
water
15
Which of the following statements defines plasmolysis?
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(C)
Shrinking away of the cytoplasm from the plant cell wall
16
Raw materials required by green plants to manufacture their food are
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(B)
inorganic substances
17
The role of ATP include all the following activities except
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(D)
producing water during aerobic respiration
18
The basis of growth involves the following processes except
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(A)
cell reduction
19
Which of the following statements is true about movement of the forearm? In
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(B)
bending the arm, the biceps contract and the triceps relax
20
Only specially adapted micro-organisms are found in
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(A)
salty water
21
Which of the following organisms causes syphilis?
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(C)
Treponema pallidlum
22
In plant respiration occurs in
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(D)
all living cells
23
A faster colour change of a dry cobalt chloride paper affixed to the lower surface of a leaf than the upper one, indicates that
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(B)
the lower surface of the leaf has more stomata
24
Which of the following takes place when a person’s body temperature rises above 37oC
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(C)
Sweating and vasodilation
25
Which of the following glands secretes a substance into the blood stream of a frightened person?
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(A)
Adrenal glands
26
Reading the verdict of a case by a judge or magistrate is an example of
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(D)
a voluntary action
27
Which of the following describes an example of fertilization in higher organisms?
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(A)
Fusion of sperm and egg nuclei
28
When both ovaries of the human female ovulate simultaneously and both ova are fertilized, then
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(B)
fraternal twins are produced
29
Which of the following statements is not true of the light stage of photosynthesis?
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(C)
Carbon (IV) oxide is reduced by hydrogen atoms in NADPH2
30
Which of the following elements is required in large amounts by plants
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(D)
Phosphorus
31
Which of the following substances has the highest amount of energy in joules per unit weight?
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(C)
Fats
32
Which of the following elements is required in large amounts by plants
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(D)
Phosphorus
33
Which of the following juices contains the enzyme ptyalin?
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(D)
Saliva
34
Trees in savannah habitats usually have heavy thick bark which mainly
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(A)
reduces the rate of transpiration
35
In the marine food web, the source of energy to the producer comes from
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(C)
sun
36
A population is best described as
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(A)
a group of the same species of organisms living together
37
Possession of strong adhesives is a feature of animals living in/on
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(B)
rocky shores
38
A stable self-sustaining environment produced by an interaction between the biotic and abiotic components is best described as
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(C)
an ecosystem
39
Which of the following factors is not associated with aquatic habitats?
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(D)
Edaphic
40
Which of the following instruments is used to measure the speed of a stream?
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(A)
Simple float
41
In an ecosystem the organism which changes light energy into stored chemical energy is the
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(C)
producer
42
Which of the following processes does not contribute to the maintenance of the nitrogen content of the soil?
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(B)
Denitrification
43
Which of the following organisms is well adapted for fluid feeding?
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(B)
Mosquito
44
The density-dependent factors that operate to regulate a population size may include the following except
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(B)
fire outbreak
45
Which of the following infections is unlikely to respond to antibiotic treatment?
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(C)
Measles
46
Algal bloom depletes oxygen content of bodies of water polluted by
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(C)
raw sewage disposal
47
Conservation of wild life is necessary mainly because
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(D)
it helps to prevent extinction of species
48
Which of the following is not a means of conservation?
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(D)
Burning of vegetation before cropping
49
Which of the following statements about mutation is true?
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(B)
The genotype is affected
50
Variation which exhibits a wide range from one extreme to the other with very little difference between the intermediates is described as
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(C)
continuous
51
Which of the following is an example of physiological variation?
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(A)
Blood groups
52
A person with blood group B can only donate blood to individuals with blood groups
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(B)
B and AB
53
If the pink colour of a petal is dominant over white what would be the colour of the flower of the F generation when a pure pink flowered plant is crossed with a white flowered plant?
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(B)
Pink
54
If two parents are sickle cell carriers then their genotypes would be
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(C)
HbA HbS and HbA HbS
55
Which disease is sex-linked and mainly afflicts male offspring?
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(B)
Haemophilia
56
In a living cell, factors which are responsible for inheritance are located
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(C)
on the chromosomes
57
Which of the following is not a correct base pairing on the DNA strand?
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(D)
Uracil, Thymine
58
Which of the following organisms is a social insect?
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(B)
Honey bee
59
Territoriality is a phenomenon among
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(C)
male animals with a group of females
60
A honey bee worker communicates with others on locating a source of food by
