A major difference between platyhelminthees and coelenterates is that platyhelminthes
Respuesta
(B)
have developed a mesoderm
5
The essential structural difference between hydra and tapeworm is that while Hydra
Respuesta
(B)
is diploblastic, tapeworm is triplobastic
6
The flowering period of plants in a habitat is determined by the
Respuesta
(A)
duration of sunlight
7
The structure labelled X is used by the organism in the same way as man uses his?
Respuesta
(A)
oesophagus
8
The structure labelled Y is the
Respuesta
(C)
macronucleus
9
Which of the following insects undergoes incomplete metamorphosis?
Respuesta
(B)
Termite
10
An onion is a bulb because it
Respuesta
(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
Respuesta
(D)
guard cell
12
Fungi are heterotropic because they
Respuesta
(D)
lack chlorophyll
13
The major site of photosynthesis in the leaf is the
Respuesta
(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
Respuesta
(D)
protein
15
The blood vessel which carries blood from the alimentary canal to the liver is the
Respuesta
(C)
hepatic portal vein
16
Gaseous exchange in Aves occurs in the
Respuesta
(C)
air sacs
17
In the absence of oxygen, the pyruvic acid produced during glycolysis is converted to CO2 and
Respuesta
(C)
ethanol
18
The excretory organ in insects is the
Respuesta
(B)
malpighian tubule
19
The structure labelled 5 is the
Respuesta
(A)
sweat gland
20
Melanin and keratin are produced in the part labelled
Respuesta
(A)
2
21
The bone of the neck on which the skull rests is known as the
Respuesta
(C)
atlas
22
Which enzymes are contained in the pancreatic juice?
Respuesta
(D)
Amylase, lipase and trypsin
23
The part labelled 3 is the
Respuesta
(C)
synovial fluid
24
The function of the part labelled 1 is to
Respuesta
(D)
hold the joint in place
25
Double fertilization in higher plants is significant because it ensures the
Respuesta
(B)
formation of a fertile embryo and the endosperm
26
In mammalian development, the function of the yolk is to
Respuesta
(A)
supply nutrients to the embryo
27
Hypogeal germination is characterized by the
Respuesta
(D)
elongation of the epicotyl
28
Fruits which develop without fertilization of the ovule are
Respuesta
(D)
parthenocarpic
29
Which part of the curve represents the fastest rate of growth?
Respuesta
(C)
M
30
The grand period of growth is represented by
Respuesta
(B)
M
31
Neurons that receive stimuli from the body or internal organs are called
Respuesta
(A)
sensory neurons
32
Which of the following is true of climax community?
Respuesta
(A)
it persists until the enviroment or climate changes
33
A population is defined as a collection of similar organism that
Respuesta
(C)
are found in the same habitat
34
In typical predator food chain involving secondary and tertiary consumers, the organism become progressively
Respuesta
(C)
larger and fewer along the food chain
35
Which level of the pyramid has the least total stored energy?
Respuesta
(D)
H
36
Which organism in the pyramid functions as a tertiary consumer?
Respuesta
(B)
Shark
37
Mangrove swamp can be found
Respuesta
(B)
where a river meets the sea
38
Soil with the finest particles is called
Respuesta
(B)
clay
39
Malaria symptoms are caused by
Respuesta
(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?
Respuesta
(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
Respuesta
(C)
AB
42
If R and r, denotes the genes for a character, the offspring of the cross between RR and Rr are
Respuesta
(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
Respuesta
(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
Respuesta
(B)
uncontrolled out-crossing can introduced unwanted variability
