Biology 2012 Jamb Examination
Biology 2012 Jamb Examination
Question 21
Which of the following animals can exist solely on the water they get from food and metabolic reactions?
Desert dwellers are adapted to arid environments and can survive with minimal water intake. They rely on water from their food and metabolic reactions, reducing dependence on free water sources.
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Question 22
The most likely first colonizers of a bare rock are
Lichens are pioneer species that can colonize bare rocks because they tolerate harsh conditions and secrete acids that break down rock surfaces, creating soil for subsequent plants.
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Question 23
The carrying capacity of a habitat is reached when the population growth begins to
Carrying capacity is the maximum population a habitat can sustain. When reached, resources become limiting and population growth levels off, maintaining stability in numbers over time.
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Question 24
The abiotic factors that control human population include
Abiotic factors are non-living environmental factors. Flooding and earthquakes directly affect human survival by destroying habitats and causing mortality, thereby influencing population size.
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Question 25
An indigenous method of renewing and maintaining soil fertility is by
Crop rotation and shifting cultivation maintain soil fertility naturally by alternating crops that replenish nutrients and allowing soil recovery periods, reducing dependence on chemical fertilizers.
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Question 26
The autonomic nervous system consists of neurons that control the
The autonomic nervous system controls involuntary functions such as heart rate, digestion, and glandular activity. It operates independently of conscious control, regulating essential body processes.
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Question 27
The water cycle is maintained mainly by
The water cycle involves continuous movement of water through evaporation, condensation, and precipitation. Evaporation and condensation are critical in recycling water and maintaining ecological balance.
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Question 28
Plants of temperate origin can be grown in tropical areas in the vegetation zones of the
Temperate plants require moderate conditions. The guinea savanna provides a suitable climate with distinct wet and dry seasons, allowing temperate plants to survive and grow in tropical zones.
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Question 29
Organisms living in an estuarine habitat are adapted to
Estuarine habitats experience varying salinity due to mixing of freshwater and seawater. Organisms in these areas are adapted to tolerate wide fluctuations in salinity to survive and reproduce successfully.
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Question 30
The presence of stilt roots, pneumatophores, sunken stomata and salt glands are adaptive features of plants found in the
Mangrove plants possess specialized features such as stilt roots for support, pneumatophores for oxygen intake, sunken stomata to reduce water loss, and salt glands to excrete excess salts in saline conditions.
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