2000 - WAEC Biology Past Questions and Answers - page 1
1
Amoeba obtains its oxygen requirements
A
from oxidising food substances
B
from air trapped in vacuoles
C
through diffusion of air into its body
D
through an air cavity in the ectoplasm
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2
Which of the following best describes a colony of volvox?
A
Asexually reproduced cells held together in a mass, but independent of each other
B
Sexually reproduced cells held together in a mass, and dependent on each other
C
Single free-living acellular units irrespective of their parental origin
D
Several units of cells, held together by cytoplasmic strands and dependent on each other
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3
The hydra has two body layers of cells called
A
ectodermis and enteron
B
ectodemt and endoderm
C
endodermis and dermis
D
epidermis and dermis
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4
All the following organelles have membranes except
A
nucleus
B
vacuole
C
cell membrane
D
cell wall
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5
Which of these has the most complex level of organization?
A
Euglena
B
Hydra
C
Heart
D
Virus
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6
The unit contained in a cell structure responsible for changes in form and shape of organisms is called
A
mitochondria
B
gene
C
ribosome
D
lysosome
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7
The plant cell mostly stores food as
A
glycogen
B
auxins
C
homtones
D
starch
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8
The presence of a large member of mitochondria in a cell indicates that
A
it has little cytoplasmic content
B
the cell is very active
C
the cell is dormant
D
the respiration is poor
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9
Which of the following statements is incorrect about diffusion?
A
It involves degradation of soluble particles in solvents
B
it occurs mainly in gaseous and liquid media
C
No membrane is needed to effect the movement of molecules
D
Molecules move from region of lower concentration to that of higher concentration.
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10
In which of the following organisms is ammonia excreted as a waste product?
A
Man
B
Bird
C
Amoeba
D
Spirogyra
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