2010 - JAMB Biology Past Questions and Answers - page 4
31
The vector for yellow fever is
A
Aedes mosquito
B
Anopheles mosquito
C
tsetse fly
D
blackfly
correct option: a
Users' Answers & Comments32
The loss of soil through erosion can be reduced by
A
watering
B
crop rotation
C
manuring
D
irrigation
correct option: b
Users' Answers & Comments33
The protozoan plasmodium falciparum is transmitted by
A
female Anopheles mosquitoes
B
female Aedes mosquitoes
C
female Culex mosquitoes
D
Female blackfly
correct option: a
Users' Answers & Comments34
A dilute solution of phenylthiocarbamide tastes bitter to some people and is tasteless to others. This is an example of
A
taste bud variation
B
discontinuous variation
C
morphological variation
D
continuous variation
correct option: b
Users' Answers & Comments35
Thyroxine and adrenalin are examples of hormones which control
A
blood grouping
B
tongue rolling
C
behavioural patterns
D
colour variation
correct option: c
Users' Answers & Comments36
A pair of genes that control a trait is referred to as
A
an allele
B
recessive
C
dominant
D
a hybird
correct option: a
Users' Answers & Comments37
The chromosome number of a cell before and after the process of meiosis is conventionally represented as
A
2n → 2n
B
n → n
C
n → 2n
D
2n → n
correct option: d
Users' Answers & Comments38
At what stage in the life history of a mammal is the sex of an individual set?
A
at adolescence
B
at puberty
C
at birth
D
at conception
correct option: d
Users' Answers & Comments39
The main distinguishing features between the soldier termite and other members of the caste are the
A
presence of wings, possession of a small head and large thorax
B
presence of wings, possession of a large thorax and a small head
C
absence of wings, possession of strong mandibles and a large head
D
absence of wings,possession of big head and the absence of mandible
correct option: c
Users' Answers & Comments40
The flippers of a whale and the fins of a fish are examples of
A
divergent evolution
B
coevolution
C
continous variation
D
convergent evolution
correct option: d
Users' Answers & Comments