The epidermis of a leaf is considered an example of a tissue because the cells
Trả lời
(C)
all possess a similar structure and function
3
The organism at the organ level of organisation of life is
Trả lời
(C)
Ginger
4
The disadvantage of complexity of organisation in the higher organisms is that it leads to
Trả lời
(D)
slower rate of diffusion of oxygen to individual cells
5
In which of the following multicellular organisms is-interdependence of cells maintained?
Trả lời
(B)
Volvox
6
Which of the following processes occurs in the second phase of meiosis?
Trả lời
(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
Trả lời
(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?
Trả lời
(D)
Insecta
9
The pulmonary circulation involves movement of the blood to and from the
Trả lời
(D)
lungs
10
Which of the individual is likely to be suffering from haemophilia?
Trả lời
(D)
IV
11
Which of the individual is likely to have HIV?
Trả lời
(C)
III
12
The diagrams above are part of the human lungs. Which of the parts is diagram Z taken from
Trả lời
(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?
Trả lời
(C)
IV
14
Increasing adrenalin content of the blood would be expected to decrease the flow of blood to the
Trả lời
(B)
heart
15
The following are all examples of a simple reflex action, except
Trả lời
(C)
walking
16
Impulses are conducted towards the nerve cell through the
Trả lời
(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
Trả lời
(C)
amphibian
18
The function of the convex lens in the correction of eye defects is to
Trả lời
(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?
Trả lời
(C)
Retina
20
The hair on the human skin will stand erect when the person is
Trả lời
(A)
in an air-conditioned room
21
When fertilization occurs that leads to formation of a zygote, which of the following processes takes place?
Trả lời
(C)
The nucleus of the sperm fuses with the egg cell
22
Which of the following structures in a flower develops into the seed?
Trả lời
(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?
Trả lời
(B)
II
24
The brightly coloured petals in some plants is an adaptive colouration for
Trả lời
(B)
pollination
25
Squirrels easily kill some trees because
Trả lời
(D)
they gnaw the bark and destroy
26
The major role played by accessory pigments during photosynthesis is to?
Trả lời
(B)
trap light energy that chlorophyll cannot absorb
27
The main raw materials required for photosynthesis are
Trả lời
(D)
carbon dioxide and water
28
What is the benefit of thunder and lightning to farmers?
Trả lời
(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?
Trả lời
(D)
Magnesium ions
30
The purpose of proteins in the diet of a mammal is to
Trả lời
(A)
promote growth and repair cells
31
Excess carbohydrates can be stored in the muscles in the form
Trả lời
(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?
Trả lời
(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?
Trả lời
(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?
Trả lời
(C)
Lipase
35
The appropriate food to be given to the child in the picture above is?
Trả lời
(A)
beans
36
Which of the following food substances will have
little or no calorific value?
Trả lời
(D)
Water
37
A space containing a group of interactive organisms
is called
Trả lời
(A)
community
38
The area around the earth where life activities go on is referred to as
Trả lời
(A)
biosphere
39
The following are abiotic components of the ecosystem except
Trả lời
(A)
bacteria
40
Which of the following instruments would be most appropriate in comparing the air pressure at different places in the habitat?
Trả lời
(B)
Barometer
41
The best title for the above diagram is
Trả lời
(A)
terrestrial food web
42
How many food chains are in the diagram?
Trả lời
(C)
Five
43
Plants with breathing roots are characteristic features of vegetation in
Trả lời
(C)
saltwater swamp
44
In which of the zones can very few organisms be found
Trả lời
(D)
IV
45
Which of the following factors exerts a major effect on the distribution of living organisms in the habitat?
Trả lời
(C)
Light
46
The use of water closet and septic tanks is preferred to the use of
bucket and pit latrines because
Trả lời
(B)
contaminated faeces are completely kept away from flies
47
The detection of vibro cholera in public drinking water is a sign of
Trả lời
(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?
Trả lời
(D)
Unfavourable climate
49
The primary cause of species endangerment is
Trả lời
(A)
disappearing habitats
50
The following pairs of traits are examples of continuous and discontinuous variations respectively except
Trả lời
(A)
eye Colour and body weight,
51
Which of the following statements is true about the ABO blood group system?
Trả lời
(B)
Antibodies are located in the blood plasma
52
The classes of fingerprints in man are
Trả lời
(C)
whorl, arch, compound and loop
53
Which of the following diseases is transmittable through genes?
Trả lời
(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?
Trả lời
(A)
75% red and 25% white
55
In the structure of DNA, which of the following statements is true?
Trả lời
(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?
Trả lời
(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?
Trả lời
(C)
1 in 4
58
What name is given to a sudden change in a gene or chromosome?
Trả lời
(C)
Mutation
59
Bees are of great importance to the farmer because they
Trả lời
(B)
pollinate flowers
60
Which of the following sequences is the correct evolutionary trend in plants?
