The epidermis of a leaf is considered an example of a tissue because the cells
отговор
(C)
all possess a similar structure and function
3
The organism at the organ level of organisation of life is
отговор
(C)
Ginger
4
The disadvantage of complexity of organisation in the higher organisms is that it leads to
отговор
(D)
slower rate of diffusion of oxygen to individual cells
5
In which of the following multicellular organisms is-interdependence of cells maintained?
отговор
(B)
Volvox
6
Which of the following processes occurs in the second phase of meiosis?
отговор
(A)
Homologous chromosomes separate
7
The muscle cell fluid of an athlete was tested immediately after a 1 O m race and was found to contain a high
concentration of lactic acid. Explain what could have caused this. The
отговор
(C)
athletes muscle must have carried out anaerobic respiration during the race
8
The graph above represents the growth pattern of an animal. Which of the following groups of animals shows this
pattern of growth?
отговор
(D)
Insecta
9
The pulmonary circulation involves movement of the blood to and from the
отговор
(D)
lungs
10
Which of the individual is likely to be suffering from haemophilia?
отговор
(D)
IV
11
Which of the individual is likely to have HIV?
отговор
(C)
III
12
The diagrams above are part of the human lungs. Which of the parts is diagram Z taken from
отговор
(C)
IV
13
The diagram above is an illustration of the human excretory system. Which of the labelled parts contains the
highest amount of nitrogenous waste?
отговор
(C)
IV
14
Increasing adrenalin content of the blood would be expected to decrease the flow of blood to the
отговор
(B)
heart
15
The following are all examples of a simple reflex action, except
отговор
(C)
walking
16
Impulses are conducted towards the nerve cell through the
отговор
(B)
dendrons
17
A student dissecting am animal specimen discovered that it had two auricle and on ventricle. The animal is likely to a/an
отговор
(C)
amphibian
18
The function of the convex lens in the correction of eye defects is to
отговор
(D)
converge light rays from far objects to focus their image on the retina
19
Which of the following parts of the eye contains light sensitive cells?
отговор
(C)
Retina
20
The hair on the human skin will stand erect when the person is
отговор
(A)
in an air-conditioned room
21
When fertilization occurs that leads to formation of a zygote, which of the following processes takes place?
отговор
(C)
The nucleus of the sperm fuses with the egg cell
22
Which of the following structures in a flower develops into the seed?
отговор
(C)
Ovule
23
An illustration of a human male reproductive system is shown above. Which
of the labelled parts can be cut to-ensure permanent sterility?
отговор
(B)
II
24
The brightly coloured petals in some plants is an adaptive colouration for
отговор
(B)
pollination
25
Squirrels easily kill some trees because
отговор
(D)
they gnaw the bark and destroy
26
The major role played by accessory pigments during photosynthesis is to?
отговор
(B)
trap light energy that chlorophyll cannot absorb
27
The main raw materials required for photosynthesis are
отговор
(D)
carbon dioxide and water
28
What is the benefit of thunder and lightning to farmers?
отговор
(A)
Addition of nitrates to the soil
29
Which of the following substances must be present in the soil for growth of a healthy green plant?
отговор
(D)
Magnesium ions
30
The purpose of proteins in the diet of a mammal is to
отговор
(A)
promote growth and repair cells
31
Excess carbohydrates can be stored in the muscles in the form
отговор
(B)
glycogen
32
The bones of the legs of a six years old boy are observed to be weak and crooked. Which of the following elements
were deficient in his mother’s diet at pregnancy?
отговор
(C)
Calcium and phosphorus
33
The diagram above is an illustration of an experimental setup to test the action of
yeast. What test would be used to confirm the nature of the gas given off at?
отговор
(B)
Pass the gas through lime water
34
Which of the following digestive enzymes would be greatly affected if the liver fails to
produce bile?
отговор
(C)
Lipase
35
The appropriate food to be given to the child in the picture above is?
отговор
(A)
beans
36
Which of the following food substances will have
little or no calorific value?
отговор
(D)
Water
37
A space containing a group of interactive organisms
is called
отговор
(A)
community
38
The area around the earth where life activities go on is referred to as
отговор
(A)
biosphere
39
The following are abiotic components of the ecosystem except
отговор
(A)
bacteria
40
Which of the following instruments would be most appropriate in comparing the air pressure at different places in the habitat?
отговор
(B)
Barometer
41
The best title for the above diagram is
отговор
(A)
terrestrial food web
42
How many food chains are in the diagram?
отговор
(C)
Five
43
Plants with breathing roots are characteristic features of vegetation in
отговор
(C)
saltwater swamp
44
In which of the zones can very few organisms be found
отговор
(D)
IV
45
Which of the following factors exerts a major effect on the distribution of living organisms in the habitat?
отговор
(C)
Light
46
The use of water closet and septic tanks is preferred to the use of
bucket and pit latrines because
отговор
(B)
contaminated faeces are completely kept away from flies
47
The detection of vibro cholera in public drinking water is a sign of
отговор
(C)
water pollution.
48
Which of the following factors would be least likely to act as a density dependent limiting factor in a population of
mice?
отговор
(D)
Unfavourable climate
49
The primary cause of species endangerment is
отговор
(A)
disappearing habitats
50
The following pairs of traits are examples of continuous and discontinuous variations respectively except
отговор
(A)
eye Colour and body weight,
51
Which of the following statements is true about the ABO blood group system?
отговор
(B)
Antibodies are located in the blood plasma
52
The classes of fingerprints in man are
отговор
(C)
whorl, arch, compound and loop
53
Which of the following diseases is transmittable through genes?
отговор
(B)
Sickle cell anaemia
54
Two plants with red flowers were back crossed, which of the following results indicate that the plants are heterozygous
red flowers, where red flowers are dominant?
отговор
(A)
75% red and 25% white
55
In the structure of DNA, which of the following statements is true?
отговор
(C)
Guanine is the opposite of cytosine
56
In a case of complete dominance, what is the phenotypic ratio of the cross Bb X Bb; where B =black and b = white?
отговор
(D)
3 blacks : 1 white
57
Two yellow-flowered hybrid plants each carrying a recessive factor for flowers with green colour were crossed.
Which of the following ratios shows the correct proportion of offspring that have green flowers?
отговор
(C)
1 in 4
58
What name is given to a sudden change in a gene or chromosome?
отговор
(C)
Mutation
59
Bees are of great importance to the farmer because they
отговор
(B)
pollinate flowers
60
Which of the following sequences is the correct evolutionary trend in plants?
