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