Which of the following structures is responsible for osmoregulation?
Répondre
(B)
II
2
Excretion is carried out through the structure labelled
Répondre
(C)
IV
3
The part labelled II is made up of
Répondre
(B)
contractile vacuole
4
The correct sequence of the levels in an increasing order of complexity is
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(B)
lll, I, l\/, ll
5
Which of the following organelles is used for locomotion in Paramecium?
Répondre
(C)
Cilium
6
Which of the following is not true of the nucleus of a living cell? It contains
Répondre
(E)
ribosomes
7
The cell membrane consists of
Répondre
(C)
lipids and proteins
8
Which of the following is not likely to be found in the cell of a ripe tomato fruit?
Répondre
(B)
Chlorophyll
9
Which of the following constitutes the main internal tissue of a leaf?
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(B)
Mesophyll
10
Four cells with osmotic potential equivalent to that of 3% salt solution were immersed respectively in solutions
of different concentrations labeled as follows: I = 4% salt solution; II = 6% salt solution III = 1% salt solution;
IV = 10% salt solution; V = 5% salt solution. Which of the solutions will cause an increase in osmotic
pressure within the cell?
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(C)
III
11
Which of the following statements is not true of osmotic process?
Répondre
(E)
. The two solutions are of equal concentration at the beginning of experiment.
12
Which of the following is the correct route for the movement of materials through the kidney?
Which of the following is the function of the hormone in the lslets of Langerhans?
Répondre
(C)
aids the rate at which glucose is converted to glycogen
14
Blood in mammals transports oxygen because it contains the pigment called
Répondre
(A)
haemoglobin
15
In which of the following is cilia not associated with movement or transport of materials?
Répondre
(D)
Mammalian alimentary canal
16
The pilaferous layers is labelled
Répondre
(A)
I
17
The xylem is labelled
Répondre
(C)
V
18
The part through which manufactured sugar is transported is labeled
Répondre
(D)
VII
19
The loss of water vapour through the aerial parts of the plant to the atmosphere is called
Répondre
(D)
transpiration
20
The upward movement of the sap in the xylem vessel is brought about by
Répondre
(C)
capillarity
21
The piece of bone represented in the diagram is found in the
Répondre
(A)
pelvic region
22
The part labelled I is the
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(C)
ilium
23
The bone that articulates with the part labelled III is the
Répondre
(B)
femur
24
Which of the following organisms is at the tissue level of organization?
Répondre
(D)
Hydra
25
The light - sensitive layer is labelled
Répondre
(E)
VII
26
The greatest concentration of light receptors is found in the part labelled
Répondre
(B)
V
27
The aqueous humour is represented by the part labelled
Répondre
(B)
II
28
Autotrophs are also described as
Répondre
(D)
producers
29
In photosynthesis, the following processes are part of the light reaction
except
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(D)
formation of glucose using energy from NADPH
30
Which of the following is not an adaptation of the small intestine for absorption of digested food? The
Répondre
(E)
small intestine leads into the large intestine
31
A dehiscent fruit formed from several fused carpels with many seeds is classified as
Répondre
(B)
a capsule
32
The translocation of food materials in plants takes place in the
Répondre
(C)
phloem
33
An association between living organisms in which one lives on and feeds at the expense of the other
organism is known as
Répondre
(A)
parasitism
34
Which of the following statements is not correct about food chains?
Répondre
(D)
There is no energy loss in a food chain
35
Which of the following characteristics is associated with commensalism?
Répondre
(C)
The association is beneficial to one of the organisms
36
Which of the following statements is not correct about the ecological effects of agricultural activities?
Répondre
(E)
Monocropping is one of the cultural methods of controlling pests.
37
Pests can be controlled without the subsequent danger of polluting the ecosystem by
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(B)
increasing the population of the natural enemies of the pest
38
The activities of an organism which affect the survival of another organism in a habitat can be described as
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(A)
biotic factors
39
Which of the following. groups of organisms feeds directly on green plants?
Répondre
(C)
Primary consumer
40
Which of the following methods is used in food preservation for a long period?
Répondre
(E)
Salting and drying the food
41
Maize is best stored against insect attack
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(B)
in fumigated silos
42
Which of the following is not an effect of overcrowding on a population?
Répondre
(C)
Commensalism
43
The term used in describing the effective management of national resources by man is
Répondre
(E)
conservation
44
Breathing roots are characteristic structures of plants growing in
Répondre
(A)
mangrove swamp
45
At which of the following stages of cell division can the cell be said to be resting
Répondre
(D)
interphase
46
Which of the following represents the phenotypic ratio, when a plant Rr is crossed with another plant Rr,
assuming that the gene R for round seed is dominant and wrinkled r is recessive?
Répondre
(D)
3:1
47
All hereditary characters in a cell are passed on from parent-cell to daughter-cell through the process of
Répondre
(A)
mitosis
48
What stage is illustrated by the diagram?
Répondre
(C)
Metaphase
49
What is the name given to the structure labelled A at this stage of cell division
Répondre
(B)
Centrtomere
50
The evidence for evolution can be obtained from the following except
Répondre
(C)
history
51
The similarity between the bone structure of the arm of a human and the fore-limb of a
rabbit indicates
Répondre
(C)
a common origin
52
What phenomenon in ecosystem does the diagram illustrate?
Répondre
(C)
Pyramid of energy
53
Which of the following effects would desertification have on the
ecological balance represented in the diagram above? The calorific
value' of the energy
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(C)
6 x 104k cal obtained at level I would increase
54
One of the methods of preventing measles is by
Répondre
(D)
vaccinating young children
55
Group instinct or social behaviour is not displayed in
Répondre
(C)
chickens
56
Which of the following fixes atmospheric nitrogen?
Répondre
(A)
Rhizobium
57
The spaces between neutrones through which impulses cross by means of chemical reaction are called
Répondre
(C)
synapses
58
The inability of some individuals to perceive the taste of some substances is an example of
Répondre
(B)
physiological variation
59
The term afforestation is used in describing
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(B)
planting trees of value to man
60
Over-crowding in seedlings of different species is less serious than over-crowding involving one species
because different species may
Répondre
(A)
have different nutritional needs
61
The autonomic nervous system comprises
Répondre
(A)
sympathetic and parasympathetic systems
62
The scientist who discovered the honey-comb structure of the cell was
Répondre
(A)
Robert Hooke
63
Which of the following organelles are likely to be present in cells that are actively respiring and
hotosynthesizing?
Répondre
(D)
Chloroplasts and mitochondria
64
Which of the following is not true about a bacterial colony growing on an agar plate?
Répondre
(C)
Different colonies have different colours
65
The theory that new organs or characteristics develop in organisms when there is a need for them was
postulated by
