Which if the following organisms is not classified as an animal?
উত্তর
(C)
Euglena
2
An organism that operates at the cellular level of organization, carries out its physiological activities by
using its
উত্তর
(B)
organelles
3
The organelle which eliminates water from the body of a protozoan is the
উত্তর
(B)
contractile vacuole
4
Which of the following cell types has the least number of mitochondria?
উত্তর
(B)
Cells of the cornified layer
5
A typical plant cell is mainly distinguished from an animal cell by the possession of
উত্তর
(C)
chloroplast and cell wall
6
Which of the following characteristics do fungi share in common with animals?
উত্তর
(C)
Storage of carbohydrates as glycogen
7
Which of the following processes involves diffusion?
উত্তর
(D)
Absorption of digested food into the villi
8
The mechanism of opening and closing of stomata in plants is based on
উত্তর
(B)
turgidity and flaccidity
9
In cellular respiration energy is made available to organisms by
উত্তর
(B)
breaking off a phosphate group from ATP
10
Excretion in Paramecium sp. is by diffusion because
উত্তর
(C)
it has a large surface area to volume ratio.
11
The axial skeleton is composed of the
উত্তর
(A)
skull and vertebral column
12
The inorganic components of bone consist of
উত্তর
(B)
magnesium, phosphorus and calcium
13
A pulse is best described as
উত্তর
(A)
contraction of arteries to let out blood.
14
The following characteristics are associated with the mammalian lungs except
উত্তর
(B)
expandable lungs
15
The excretory system in mammals consists of the following parts except
উত্তর
(C)
two bladders
16
The organ that receives reduced flow of blood during vigorous exercise is the
উত্তর
(A)
brain
17
The ear pinna is strengthened by
উত্তর
(B)
cartilage
18
The relationship between the retina and the brain is similar to that between the
উত্তর
(B)
cochlea and the brain.
19
Which of the following statements about the development of the foetus is not correct?
উত্তর
(A)
The circulatory system of the foetus is directly connected to the maternal blood vessels
20
The parts that supply food and water to the developing embryo are labelled
উত্তর
(C)
V and VI
21
The part labelled III is the
উত্তর
(B)
chalaza
22
Which of the following statements ls true about transpiration? It is the
উত্তর
(A)
loss of water in the form of vapour from the surface of the’ leaf
23
Transportation of water in the xylem tissue involves the following except
উত্তর
(D)
translocation
24
The following are the major reasons why the butterfly lays eggs under the surface of a leaf except to
উত্তর
(D)
camouflage the eggs
25
In which of the following organic compounds is the hydrogen-oxygen ratio equal to 2:1?
উত্তর
(B)
Carbohydrates
26
A man suffering from obesity must avoid meals containing
উত্তর
(A)
margarine and butter
27
In testing for starch in a leaf, the leaf is first boiled in water for about a minute so that the
উত্তর
(B)
cells are killed
28
Which of the following food substances is incorrectly linked to its enzyme?
উত্তর
(C)
Sucrose - pepsin
29
Which of the following pH values is the best for the action of the enzymes - renin and pepsin in the
stomach?
উত্তর
(A)
pH2
30
The bacterium in a mutualistic association with legumes converts
উত্তর
(D)
nitrites to nitrates
31
An herbivore cannot feed on a piece of meat because it has no
উত্তর
(B)
canines to tear up the meat
32
In a particular habitat the role of an organism is referred to as its
উত্তর
(C)
niche
33
The distribution of organisms in a fresh water habitat like a stream or pond is determined by the following
factors except
উত্তর
(B)
pH of the soil
34
The speed of wind is measured using the
উত্তর
(B)
anemometer
35
Which of the following is a biotic component of an ecosystem?
উত্তর
(D)
Fungi
36
A moss plant can withstand drought by means of its
উত্তর
(A)
spores
37
Which of the following factors is the main problem facing xerophytic plants?
উত্তর
(D)
Lack of adequate water
38
The following are greenhouse gases except
উত্তর
(D)
oxygen
39
Rural-urban migration in developing countries can be prevented by
উত্তর
(D)
even distribution of facilities in both regions
40
Muscles are attached to bones by means of
উত্তর
(A)
tendons
41
In a population, food shortage may lead to
উত্তর
(C)
intra-specific competition
42
The following effects are associated with deforestation except
উত্তর
(D)
increase in rainfall
43
The main reason for the conservation of wildlife is to
উত্তর
(D)
save some species from extinction.
44
Which of the following is an example of variation?
উত্তর
(B)
Tongue rolling
45
The parameters of size, height, weight and colour in a population of living things are examples of
উত্তর
(C)
continuous variations
46
Fingerprints are useful in crime detection because
উত্তর
(C)
no two people have the same fingerprint
47
A person with blood group, O can be given blood from persons who have blood belonging to
উত্তর
(A)
group O only
48
A man heterozygous for albino gene marries a woman who is also heterozygous for the gene. Both have normal skin colour. The probability that they will have an albino child is
উত্তর
(B)
1/4
49
Which of the following statements about heredity is not true? In heredity the traits are
উত্তর
(C)
always transmitted by one parent
50
An example of a saprophytic relationship is a / an
উত্তর
(B)
mushroom growing on decaying vegetation
51
In artificial selection, individuals without desirable traits may be prevented from mating by
উত্তর
(B)
sterilization
52
In a family of eight (8) all the children are girls Which of the following reasons correctly explains this?
উত্তর
(D)
The X component of the man’s sex chromosome was always involved.
53
Which of the following statements is correct about the structure of a chromosome? A chromosome consists of
উত্তর
(A)
two chromatids joined at the centromere
54
Mr. Andrew, his wife and child belong to blood groups A, B and O respectively. The genotypes of both parents are
উত্তর
(D)
IA IO and IB IO.
55
What would be the phenotypic ratio of the offspring of a cross between a heterozygous dominant parent and a double recessive parent?
