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A.
one chromosomes from the male joins another form the female
B.
one gene from the male combines with the other from the female
C.
the male nucleus fuses with the female nucleus
D.
one set of h\chromosome combines with another set form the female
Explanation. Give a better Explanation
(B)


12.
The neck region of the tapeworm (Taenia spp.) is responsible for the
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A.
production of eggs
B.
the storage of eggs
C.
the formation of new segments
D.
the development of the suckers.
Explanation. Give a better Explanation
(C)


13.
The movement of molecules from a region of higher concentration to one of lower concentration is
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A.
diffusion
B.
transpiration
C.
osmosis
D.
plasmolysis
Explanation. Give a better Explanation
Diffusion is the movement of molecules or ions form a region of higher concentration to that of lower concentration. (A)


14.
The region of cell division in a root is
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A.
root cap
B.
endodermis
C.
xylem
D.
Meristem
Explanation. Give a better Explanation
Tissue which are capable of cell division are called Meristem. Those responsible for the increase of length of roots and stems are found at the lips and are therefore the region of cell division which is at the apical region (i.e. tips of the roots) (A)


15.
Which of the following is not an excretory organ?
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A.
Luns
B.
kidney
C.
leaf
D.
large intestine
Explanation. Give a better Explanation
Large intestine is involved in digestive system (D)


16.
The part of the mammalian brain responsible for maintaining balance is
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A.
medulla oblongata
B.
cerebellum
C.
optic lobe
D.
cerebrum
Explanation. Give a better Explanation
The cerebellum is concerned with hearing, balance and s\muscular control (C).


17.
A sugar solution was boiled with Fehling’s solutions A and B and the colour remain blue. The sugar tested was
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A.
glucose
B.
maltose
C.
fructose
D.
sucrose
Explanation. Give a better Explanation
Test for reducing sugar (glucose)


18.
The blood vessel which carries digested food from the small intestine to the liver is
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A.
renal vein
B.
renal artery
C.
hepatic artery
D.
hepatic portal vein
Explanation. Give a better Explanation
Hepatic portal vein carries digested food form small intestine (D).


19.
The maize grain is regarded as a fruit and not a seed because
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A.
it is covered by a sheath of leaves
B.
the testa and fruit wall fuse after fertilization
C.
it has both endosperm and cotyledon
D.
the pericarp and seed coat are separate
Explanation. Give a better Explanation
Maize is really a fruit, because the outer coat covering the grain represents the pericarp of the fruit fused with the testa to the seed (B).


20.
Identical twins are produced under one of the following conditions
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A.
Two ova fertilized at the same time by the sperm
B.
One ovum fertilized, divides to give two embryos
C.
Two ova fertilized by one sperm
D.
One ovum fertilized by two sperms
Explanation. Give a better Explanation
The ovum divides after fertilization (B).


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