10 questions from the JAMB 2011 Biology paper, with answers and explanations. Tap "Show answer" under each one when you are ready.
JAMB 2011Question 1 · Agricultural Science and Basic Biology
The ability of living organism to detect and respond to changes in the environment is referred to as
A.locomotion
B.irritability
C.growth
D.taxis
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Answer: B. irritability
Irritability (sensitivity) is the ability of a living organism to detect and respond to changes (stimuli) in its environment.
JAMB 2011Question 2 · Cell Biology and Biochemistry
Use the following information to answer the question below. I. Test tube containing cane sugar and water . ll. Test tube containing cane sugar and diluted acid. III. Test tube containing cane sugar and its degrading enzyme . In which of the test tubes will glucose be detected after complete hydrolysis?
A.l and ll only
B.ll and lll only
C.l only
D.l, ll and lll
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Answer: B. ll and lll only
Cane sugar (sucrose) is hydrolyzed to glucose and fructose by either dilute acid or its specific enzyme (sucrase), but not by water alone.
JAMB 2011Question 3 · Ecology and Environment
The adaptive importance of nuptial flight from termite colonies is to
A.disperse the reproductives in order to establish new colonies
B.provide abundant food for birds and other animals during the early rains
C.ensure cross-breeding between members of one colony and another
D.expel the reproductives so as to provide enogh food for other members
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Answer: A. disperse the reproductives in order to establish new colonies
Nuptial flight allows termite reproductives to disperse away from the parent colony and establish new colonies elsewhere.
JAMB 2011Question 4 · Ecology and Environment
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
A.16.7%
B.17.6%
C.26.7%
D.16.2%
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Answer: A. 16.7%
Wet soil mass = 101.5-80.5 = 21g. Roasted (humus-free) soil mass = 95.5-80.5 = 15g... using oven-dried mass (99.0-80.5=18.5g) vs roasted mass (15g), humus lost = 18.5-15 = 3.5g. Percentage humus (of original wet soil sample, 21g) = 213.5 x100 = 16.7%.
JAMB 2011Question 5 · Ecology and Environment
Habitats are generally classified into
A.biotic and abiotic
B.aquatic and terrestrial
C.aboreal and marine biomes
D.microhabitats and macrohabitats
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Answer: B. aquatic and terrestrial
Habitats are broadly classified into aquatic and terrestrial habitats.
JAMB 2011Question 6 · Ecology and Environment
The bright coloured eye spots on the wings of moth are an example of
A.warning colouration
B.disruptive colouration
C.crypsis
D.mimicry
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Answer: A. warning colouration
Bright, conspicuous eye spots on moth wings serve as a warning/intimidation display to startle or deter predators.
JAMB 2011Question 7 · Genetics and Evolution
The crossing of individuals of the same species with different genetic characters is
A.cross breeding
B.polygenic inheritance
C.non-disjunction
D.inbreeding
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Answer: A. cross breeding
Crossing individuals of the same species with different genetic characteristics is called cross-breeding (hybridization).
JAMB 2011Question 8 · Mammalian Physiology and Anatomy
In mammals, the exchange of nutrients and metabolic products occurs in the
A.lungs
B.oesophagus
C.trachea
D.lymph
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Answer: D. lymph
The lymphatic system (lymph) is involved in the exchange of nutrients and metabolic products between blood and tissues.
JAMB 2011Question 9 · Mammalian Physiology and Anatomy
During blood transfusion, agglutination may occur as a result of the reaction between
A.contrasting antigens and antibodies
B.two different antigens
C.two different antibodies
D.similar antigens and antibodies
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Answer: A. contrasting antigens and antibodies
Agglutination during blood transfusion results from a reaction between incompatible (contrasting) antigens on red cells and antibodies in plasma.
JAMB 2011Question 10 · Microbiology and Disease
Drancunculiasis can be contacted through
A.eating contaminated food
B.drinking contaminated water
C.bathing in contaminated water
D.bites of blackfly
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Answer: B. drinking contaminated water
Dracunculiasis (guinea worm disease) is contracted by drinking water contaminated with infected water fleas.
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