2012 - JAMB Biology Past Questions and Answers - page 2
11
The carrying capacity of a habitat is reached when the population growth begins to
A
increase slowly
B
increase exponentially
C
slow down
D
remain steady
correct option: d
Users' Answers & Comments12
The abiotic factors that control human population include
A
disease and famine
B
space and rainfall
C
flooding and earthquake
D
temperature and disease
correct option: c
Users' Answers & Comments13
An indigenous method of renewing and maintaining soil fertility is by
A
clearing farms by burning
B
planting one crop type
C
adding inorganic fertilizers yearly
D
crop rotation and shifting cultivation
correct option: d
Users' Answers & Comments14
The diseases caused by water-borne pathogens include
A
gonorrhoea and poliomyelitis
B
typhoid and syphilis
C
tuberculosis and cholera
D
typhoid and cholera
correct option: d
Users' Answers & Comments15
Which of the following is true in blood transfusion?
A
person of blood group AB can donate blood only to another person of blood group AB
B
persons of blood groups A and B can donate or receive blood from each other
C
A person of blood group AB acn receive blood only from persons of blood group A or B
D
A person of blood group O can donate only to a person of blood group O
correct option: a
Users' Answers & Comments16
A yellow maize is planted and all the fruits obtained are of yellow seeds. When they are croos-bred, yellow seeds and white seeds are obtained in a ratio 3:1 . The yellow seed is said to be
A
non-heritable
B
sex-linked
C
a recessive trait
D
a dominant trait
correct option: d
Users' Answers & Comments17
When a colour-blind man marries a carrier woman. What is the probability of their offspring being colour blind?
A
25%
B
50%
C
75%
D
100%
correct option: b
Users' Answers & Comments18
The correct base pairing for DNA is
A
adenine → thymine and guanine → cytosine
B
adenine → guanine and thymine → cytosine
C
adenine → cytosine and guanine → thymine
D
adenine → adenine and cytosine → cytosine
correct option: a
Users' Answers & Comments19
The short thick break in birds is an adaptation for
A
crushing seeds
B
sucking nectar
C
tearing flash
D
straining mud
correct option: a
Users' Answers & Comments20
The basking of Agama lizards in the sun is to
A
change the colour of their body
B
raise their body temperature to become active
C
fight to defend their territories
D
attract the female for courtship
correct option: b
Users' Answers & Comments