A major difference between platyhelminthees and coelenterates is that platyhelminthes
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(B)
have developed a mesoderm
5
The essential structural difference between hydra and tapeworm is that while Hydra
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(B)
is diploblastic, tapeworm is triplobastic
6
The flowering period of plants in a habitat is determined by the
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(A)
duration of sunlight
7
The structure labelled X is used by the organism in the same way as man uses his?
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(A)
oesophagus
8
The structure labelled Y is the
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(C)
macronucleus
9
Which of the following insects undergoes incomplete metamorphosis?
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(B)
Termite
10
An onion is a bulb because it
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(B)
has a reduced stem and thick fleshy leaves
11
The flow of air and water in or out of the mesophyll layer of a leaf is controlled by the
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(D)
guard cell
12
Fungi are heterotropic because they
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(D)
lack chlorophyll
13
The major site of photosynthesis in the leaf is the
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(A)
palisade parenchyma
14
5 cm3 dilute sodium hydroxide solution and 5 cm3 one percent copper sulphate solution are added to a solution of food specimen. The purple colour which is observed shows the presence of
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(D)
protein
15
The blood vessel which carries blood from the alimentary canal to the liver is the
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(C)
hepatic portal vein
16
Gaseous exchange in Aves occurs in the
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(C)
air sacs
17
In the absence of oxygen, the pyruvic acid produced during glycolysis is converted to CO2 and
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(C)
ethanol
18
The excretory organ in insects is the
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(B)
malpighian tubule
19
The structure labelled 5 is the
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(A)
sweat gland
20
Melanin and keratin are produced in the part labelled
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(A)
2
21
The bone of the neck on which the skull rests is known as the
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(C)
atlas
22
Which enzymes are contained in the pancreatic juice?
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(D)
Amylase, lipase and trypsin
23
The part labelled 3 is the
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(C)
synovial fluid
24
The function of the part labelled 1 is to
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(D)
hold the joint in place
25
Double fertilization in higher plants is significant because it ensures the
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(B)
formation of a fertile embryo and the endosperm
26
In mammalian development, the function of the yolk is to
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(A)
supply nutrients to the embryo
27
Hypogeal germination is characterized by the
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(D)
elongation of the epicotyl
28
Fruits which develop without fertilization of the ovule are
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(D)
parthenocarpic
29
Which part of the curve represents the fastest rate of growth?
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(C)
M
30
The grand period of growth is represented by
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(B)
M
31
Neurons that receive stimuli from the body or internal organs are called
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(A)
sensory neurons
32
Which of the following is true of climax community?
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(A)
it persists until the enviroment or climate changes
33
A population is defined as a collection of similar organism that
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(C)
are found in the same habitat
34
In typical predator food chain involving secondary and tertiary consumers, the organism become progressively
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(C)
larger and fewer along the food chain
35
Which level of the pyramid has the least total stored energy?
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(D)
H
36
Which organism in the pyramid functions as a tertiary consumer?
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(B)
Shark
37
Mangrove swamp can be found
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(B)
where a river meets the sea
38
Soil with the finest particles is called
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(B)
clay
39
Malaria symptoms are caused by
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(B)
the multiplication of the malaria sporozites in the liver
40
Which of the following is true of the children of a heamophilic man who marries a woman that is not haemophilic and does not carry the trait?
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(C)
All their daughters will be carriers
41
A child with blood group genotype different from those of both parents and with a mother of genotype OO, can only have a father of genotype
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(C)
AB
42
If R and r, denotes the genes for a character, the offspring of the cross between RR and Rr are
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(C)
2RR, 2Rr
43
A mammal with red fur and long ears was crossed with another having white fur and short ears. If the offspring had a red fur and short ears, the
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(A)
character are linked
44
Pawpaw seeds collected from a tree with many desirable agronomic qualities did not give rise to plants of desirable character as the parent because
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(B)
uncontrolled out-crossing can introduced unwanted variability
