1990 - JAMB Biology Past Questions & Answers - page 1

1
The salinity of a brackish enviroment
A
increases immediately after rain
B
increase at the end of rainy season
C
Decrease with increase in micro-organisms
D
increase during dry season
CORRECT OPTION: d
2
Physiological adaptation to very dry condition in animals is called
A
hibernation
B
aestivation
C
rejuvenation
D
xeromorphism
CORRECT OPTION: b
3
Which set of disease is spread mainly by insect vectors?
A
Cholera, tenia and gonorrhoea
B
Poliomyelitis, tuberculosis and syphilis
C
Cholera, malaria and tuberculosis
D
Malaria, cholera and river blindness
CORRECT OPTION: d
4
Which of the following constitute pollution?
A
Droppings from birds
B
loud disco sound
C
A pack of cigarettes
D
Refuse in an incinerator
CORRECT OPTION: b
5
An acidic soil can be improved upon by
A
sedimentation
B
leaching
C
flocculation
D
watering
CORRECT OPTION: c
6
What do bacteria in root nodules derive from the host plant?
A
Protection and minerals
B
Water and minerals
C
Carbonhydrates and water
D
Protection and carbohydrates
CORRECT OPTION: a
7
Free nitrogen is released to the atmosphere by
A
Nitrogen-fixing bacteria
B
nitrifying bacteria
C
denitrifying bacteria
D
saprophytic bacteria
CORRECT OPTION: c
8
Which structure is the glomerulus?
A
5
B
3
C
2
D
1
CORRECT OPTION: b
9
If the blood is too concentrated, more water is absorbed from
A
5
B
4
C
3
D
1
CORRECT OPTION: b
10
All the cell bodies in the spinal cord are found in
A
1
B
2
C
3
D
4
CORRECT OPTION: a
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