A group of closely related organisms capable of interbreeding to produce fertile offspring are known as members of a
2
Viruses are economically important because they?
3
A beaker of pond water containing few specimens of Euglena was placed in a dark room for two weeks. At the end of this period, the specimens of Euglena were still alive because they were
4
The cytoplasm of the cell is considered a very important component because it
5
After an hour, the level of water in the thistle funnel will
6
The experiment above is used to demonstrate the process of
7
In plant cells the role of the membrane is played by the
8
Red blood cells were found to have burst open after being placed in distilled water for an hour. This phenomenon is known as
9
The curvature movement of plants in response to the stimulus of water is called
10
Two organelles directly involved in mitotic cell division are
11
The following statements about mitotic cell division are correct except that
12
The longest bone in the body is the
13
Which of the following structures is not a skeletal material?
14
The reason why the flow of blood through the capillaries is very slow is
15
Which of the following features is not characteristic of arteries? Arteries
16
A group of rats placed in an air-tight box for some hours died because they
17
Which of the following organisms have kidney as their excretory organ?
18
Which of the statements below is valid?
19
What physiological term can he used to describe the regulation of the body temperature of the lizard? '
20
The reason why hospitals use saline solutions as drip instead of water is
21
The part of the ear which contains nerve cells sensitive to sound vibrations is the
22
Spectacles with convex lenses correct long-sightedness by
23
A seed of a flowering plant can best be described as
24
Which of the following processes removes carbon from the atmosphere?
25
Which of the following cycles involves the process of precipitation and transpiration?
26
The mesophyll layer of a leaf consists of
27
Which of the following treatments would increase the rate of transpiration in a potted plant?
28
Pepsin is secreted as an inactive precursor called pepsinogen because
29
An organism whose source of carbon is inorganic is likely to be a/an
30
Which of the following organisms is an endoparasite?
31
Which of the following statements about ecosystems is false?
32
What is the critical limiting factor for plants below the photic zone is an aquatic ecosystem?
33
Which of the following instruments is used to estimate the number of plants in a habitat?
34
Which of the following statements is true about sandy soil? It
35
Which of the following organisms is a primary consumer?
36
P → Q → R → S → T he organism designated P in the food chain above is normally sustained by energy from
37
P → Q → R → S → T Which of the following statements best describes the organism designated R? It
38
Food chains are relatively short because
39
which of the following organisms does not show colour adaptation to its environment?
40
Most tropical plants shed their leaves during dry weather conditions in order to
41
Which of the following features is not an adaptation of plants to aquatic habitat?
42
The following habitats can be used in the study of succession except
43
Population growth rate may be defined as the
44
In ecological succession, since Iichens grow on bare rock, they are considered to be
45
Which of the following factors will most likely lead to overcrowding within a population?
46
A species whose populations has become so small that it may become extinct if not protected is a/an
47
Which of the following practices does not contribute to the preservation and improvement of the environment?
48
Variation is important in human life and can be used for the following activities except
49
An example of continuous variation is
50
The outward appearance or an organism is referred to as
51
The allele responsible for sickle-cell anaemia first appeared in the tropical and subtropical regions of Asia, the Middle East and Africa. It entered the United States of America when individuals were forcibly brought over from Africa. In micro- evolutionary terms this is an example of
52
Which of the following diseases is not hereditary?
53
The immediate product of meiosis in flowering plants is the
54
DNA in eukaryotic cells is contained in the
55
A man who is heterozygous for the disease haemophilia marries a woman who is double recessive for haemophilia. What percentage of their offspring would have the disease?
56
A dairy farmer allowed only his best milk producing cows to mate. In succeeding generations of cows: milk production increased. This outcome is an example of
57
Cytokinesis of mitosis is a process that ensures that
58
An animal which is active during the day is known as
59
Evidence for evolution include the following except?
