1993 - JAMB Biology Past Questions and Answers - page 3
21
Which of the following is TRUE of the process of conjugation in paramecium?
A
Micronucleus disintegrates
B
Each ex-conjugant divides only once
C
Macronucleus undergoes division
D
Each micronucleus divides twice
correct option: d
Users' Answers & Comments22
The bright colours of the comb and feathers in the peacock are for
A
sex differenciation
B
beauty
C
courtship
D
defence
correct option: c
Users' Answers & Comments23
The main function of the petal of a flower is to
A
attract pollination agents
B
protect the flower while still in bud
C
serve as landing stage for insects
D
protect the inner paisr from desiccation
correct option: a
Users' Answers & Comments24
In the mammal, the autonomic nervous system consists of
A
sympathetic and parasympathetic system
B
brain and spinal nerves
C
brain and cranial nerves
D
spinal cord and spinal nerves
correct option: a
Users' Answers & Comments25
A
the epicotyl grows faster than the hypocotyl
B
the hypocotyl grows faster than the epicotyl
C
both grow at the same rate
D
the epicotyl outgrow the radicle
correct option: b
Users' Answers & Comments26
A
carry out initial photosynthesis for the seedlings
B
protect the young leaves from mechanical damage
C
protect the young leaves from sun light
D
protect the young leaves from insects pest
correct option: a
Users' Answers & Comments27
When it is cold, the blood vessels of the skin
A
dilates to increase the amount of blood flowing
B
constrict to reduced the amount of blood flowing to the skin
C
dilate to reduce the amount of blood flowing to the skin
D
constrict to increase the amount of blood flowing to the skin
correct option: b
Users' Answers & Comments28
Which path does sound entering the human ear follow?
A
Oval window → ossicles → ear drum
B
Ear drum → oval window → ossicles
C
Ear drum → ossicles → oval window
D
Ossicles → ear drum → oval window
correct option: c
Users' Answers & Comments29
What would happen to a man whose pancreas has been surgically removed?
A
The level of blood sugar would increase
B
The glycogen content of the liver would increase
C
His blood pressure would decrease
D
His weight would increase appreciably
correct option: a
Users' Answers & Comments30
Carnivorous plants are usually found in areas
A
which are deficient of nitrate
B
which are deficient of oxygen
C
with low pH
D
where insects are abundant
correct option: d
Users' Answers & Comments