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