2011 - JAMB Biology Past Questions and Answers - page 3
21
The sequence of the one-way gaseous exchange mechanism in a fish is
A
operculum → gills → mouth
B
gills → operculum → mouth
C
mouth → operculum → gils
D
mouth → gills → operculum
correct option: d
Users' Answers & Comments22
The type of asexual reproduction that is common to both Paramecium and protists is
A
budding
B
sporulation
C
fragmentation
D
fission
correct option: d
Users' Answers & Comments23
In nature, plants and animals are perpetually engaged in mutualism because
A
they are rivals
B
all animals rely on food produced by plants
C
they utilize respiratory wastes of each other
D
they are neighbours
correct option: c
Users' Answers & Comments24
In an experiment to determine the percentage of humus and water in a soil sample, the following results were obtained
Weight of the evaporating basin alone = 80.5g
Weight of basin and soil = 101.5g
Weight after drying the soil in the oven = 99.0g
Weight of basin and roasted soil = 95.5g
The percentage of humus in the soil sample is
Weight of the evaporating basin alone = 80.5g
Weight of basin and soil = 101.5g
Weight after drying the soil in the oven = 99.0g
Weight of basin and roasted soil = 95.5g
The percentage of humus in the soil sample is
A
16.7%
B
17.6%
C
26.7%
D
16.2%
correct option: a
Mass of Soil = 101.5 - 80.5 = 21.0g
Mass of humus = (99.0 - 95.5)g = 3.5g
% of humus = \(\frac{3.5}{21.0} \times \frac{100}{1}}
= 16.7%
Users' Answers & CommentsMass of humus = (99.0 - 95.5)g = 3.5g
% of humus = \(\frac{3.5}{21.0} \times \frac{100}{1}}
= 16.7%
25
An example of a filter -feeding animal is
A
shark
B
butterfly
C
whale
D
mosquito
correct option: d
Users' Answers & Comments26
Which of the following is a feature of the population pyramid of a developing country?
A
long lifespan
B
low birth rate
C
low death rate
D
short lifespan
correct option: c
Users' Answers & Comments27
The interaction of a community of organisms with its abiotic environment constitutes
A
niche
B
a food chain
C
an ecosystem
D
a mirohabitat
correct option: c
Users' Answers & Comments28
The vector of the malaria parasite is
A
female Aedes mosquito
B
female Anophelous mosquito
C
male Culex mosquito
D
female Culex mosquito
correct option: b
Users' Answers & Comments29
Which of the following instruments is used to measure relative humidity?
A
Hydrometer
B
Thermometer
C
Hygrometer
D
Anemometer
correct option: c
Users' Answers & Comments30
Exo-erythrocytic phase of the life cycle of malaria parasite occurs in the
A
liver of humans
B
reticuloendothelial cells of humans
C
Malphigian tubules of mosquito
D
brain of humans
correct option: a
Users' Answers & Comments