2005 - WAEC Biology Past Questions and Answers - page 2
11
Which of the following pairs of organisms exist as colonies?
A
Obelia and Euglena
B
Pandorina and Volvox
C
Chlamydomonas and Amoeba
D
Hydra and Spirogyra
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12
Which of the following Best explains why It is difficult to see clearly in dim light?
A
Initially the eyes cannot operate when the light is dim
B
The choroid reflect all the light that enters the eye
C
Too little light reaches the retina and so the cones may not be stimulated at all
D
Dim light causes the pupil to close up so that not much light enters the eye
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13
In active transport, molecules move against a concentration gradient, therefore
A
molecules move from a region of low concentration to a region of high concentration
B
molecules move from a region of high concentration to a region of low concentration
C
the concentration gradient has little effect on the movement of molecules
D
molecules force their way through special channels
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14
Which of the following substance pass through the root cell membrane by osmosis?
A
Cell sap
B
Carbon dioxide
C
oxygen
D
water
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15
Which of the following statements defines plasmolysis?
A
Shrinking of a plant cell in a solution
B
Shrinking away of cytoplasm from an animal cell membrane
C
Shrinking away of the cytoplasm from the plant cell wall
D
shrinking of the vacuole and leaving the cytoplasm attached to the cell wall
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16
Raw materials required by green plants to manufacture their food are
A
mainly fluids
B
inorganic substances
C
living materials
D
mainly gases
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17
The role of ATP include all the following activities excerpt
A
provision of energy to do work in living organisms
B
transmission of nerve impulse
C
keeping the body warm in homoithermic animals
D
producing water during aerobic respiration
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18
The basis of growth involves the following processes except
A
cell reduction
B
cell division
C
cell differentiation
D
cell enlargement
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19
Which of the following statements is true about movement of the forearm? In
A
bending the arm, the biceps relax and the triceps contract
B
bending the arm, the biceps contract and the triceps relax
C
straightening the arm the biceps contract and the triceps relax
D
straightening the arm, both biceps and triceps contract
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20
Only specially adapted micro-organisms are found in
A
salty water
B
humid air
C
moist soil
D
mouth cavities
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