Which of the following methods of reproduction is common to Paramecium and Amoeba?
отговор
(C)
Binary fission
2
Which of the following structures controls the activities of the living cell?
отговор
(A)
Nucleus
3
Most of the energy in the cell is produced in the
отговор
(A)
mitochondrion
4
The structure in the cell that controls the movement of substances in and out of the cell is the
отговор
(A)
cytoplasmic membrane
5
Which of the following structures differentiates an animal cell from a plant cell?
отговор
(C)
Chloroplast
6
At the end of mitosis the number of cells produced from a parent cell is
отговор
(E)
two
7
Which of the following statements is not correct of respiration?
отговор
(C)
Carbondioxide produced in the tissues is removed by the process of osmosis
8
At which of the following stages of mitosis do the two daughter chromosomes separate completely?
отговор
(C)
Anaphase
9
Which of the following processes is not evident from the drawing?
отговор
(C)
Chromatids held by centromere
10
The stage of mitosis represented in the diagram is known as the
отговор
(B)
metaphase
11
Which of the following is not a function of the mammalian skeleton? It
отговор
(E)
contracts and relaxes to bring about movement
12
What type of vertebra is represented in the diagram?
отговор
(E)
Lumbar vertebra
13
The structure labelled A represents the
отговор
(C)
neural canal
14
Which of the following statements is not correct about the functions of each group
of mammalian vertebrae?
отговор
(D)
Sacral vertebrae support the skull and allow nodding and rotating movements
15
The stems of young herbaceous plants are kept upright mainly by
отговор
(B)
turgor pressure
16
Different tissues in plants contribute to the support of the parts as a result of the following characteristics
except
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(A)
malleability
17
Water vapour is lost in plants during transpiration through
отговор
(A)
stomata and lenticels
18
Gaseous exchange takes place in the adult toad through the
отговор
(B)
buccal cavity, skin and lungs
19
Breathing movement in mammals is accompanied by regular movements of the diaphragm and the
отговор
(A)
intercostal muscles
20
Which of the following are components of glomerular filtrate?
отговор
(C)
All the components of blood except plasma protein and cells
21
The mechanism by which useful materials in the glomerular filtrate are taken back into the blood is known
as
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(B)
reabsorption
22
Which of the following takes place during the process of detoxication in the liver?
отговор
(A)
Poisonous substances in the body are converted into harmless substances
23
The cup-shaped part of the Bowman’s capsule contains
отговор
(B)
glomerulus
24
The increase in width of blood vessels in the mammalian skin at high temperatures is known as
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(A)
vasodilation
25
The condition known as cretinism is caused by the deficiency of
отговор
(D)
thyroxin
26
Which of the following parts of the mammalian brain is involved in taking the decision to run rather than
walk?
отговор
(E)
Cerebrum
27
The brain and spinal cord make up the
отговор
(C)
central nervous-system
28
Which of the following is not true about auxins? They
отговор
(B)
are used in the site of production
29
Which of the following stimuli are not perceived through the skin of mammals?
отговор
(A)
Light
30
Which of the following parts of the' tongue does not correspond to the taste indicated against it?
отговор
(C)
Back-sour
31
The structures labelled III, VI, IV and II respectively represent the
отговор
(A)
uterus, cervix, oviduct and ureter
32
The gamete is produced in the structure labelled
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(E)
V
33
What is the difference between viviparous and oviparous animals?
отговор
(E)
Laying and brooding of eggs
34
The structure of the embryo which develops and makes contact with the uterine
wall is known as the
отговор
(A)
umbilical cord
35
The organ located in the mammalian abdominal cavity just below the diaphragm
and lying on top of the stomach is the
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(C)
liver
36
Which of the following is the effect of using artificial pollination in plant breeding?
отговор
(B)
Improvement of the variety of crops
37
A dry indehiscent fruit containing one seed and possessing a hairy pappus is described as
отговор
(C)
a cypsela
38
Thunderstorm can be beneficial to plants because it
отговор
(C)
adds nitrates to the soil
39
Which of the following is a nitrifying bacterium
отговор
(A)
Nitrobacter
40
Which of the following reagents is used for the test for starch?
отговор
(D)
Iodine solution
41
Which of the following is an autotrophic mode of nutrition?
отговор
(A)
Chemosynthesis
42
Which of the following is not a way of reducing air pollution?
отговор
(E)
Recycling tins, cans and bottles
43
Which of the following factors is not associated with aquatic habitat?
отговор
(E)
Humidity.
44
Which of the following types of soil has the highest water-retaining capacity?
отговор
(A)
Clay
45
Changes in energy flow between organisms in a habitat can be represented by a
отговор
(C)
pyramid of energy
46
Which of the following processes is not involved in the carbon cycle?
отговор
(C)
Transpiration
47
Which of the following processes are involved in a water cycle?
отговор
(A)
Evaporation, condensation and precipitation
48
Water in the human body is derived from the following sources except through
отговор
(E)
absorption by the skin
49
The conservation of natural resources can be achieved by the following except
отговор
(D)
deregulated harvesting
50
Water rises most rapidly in
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(A)
sandy soil
51
Thrombocytes are blood cells responsible for initiating
отговор
(C)
clotting of the blood
52
When gametes from pure breeding parents with contrasting features such as tallness and shortness are
involved in monohybrid cross, the offspring in the first filial generation are usually
отговор
(B)
heterozygous dominant
53
A pair of genes which controls a trait is described as?
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(C)
allele
54
The genetic make-up of an organism is described as its
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(B)
genotype
55
The precondition for transfusion of blood to an accident victim is
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(C)
cross-matching the blood group of the donor with that of the accident victim
