Biology 2019 Jamb Examination
Biology 2019 Jamb Examination
Question 61
The association between two organisms living together in which only one benefits from the association while the other is neither benefited nor harmed is
Commensalism is a type of symbiotic relationship in which one organism benefits while the other is neither helped nor harmed. Examples include barnacles on whales or epiphytic plants on trees, where the host remains unaffected.
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Question 62
Which of the following will have the least effect on the rate of change of the numbers in a population
Mutations occur randomly and rarely produce immediate large-scale changes in population size. In contrast, food supply, disease, and predation directly influence survival and reproduction, thus having a much greater effect on population numbers.
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Question 63
Which of the following controls all voluntary actions
The cerebrum is the largest part of the brain responsible for all voluntary actions, including movement, speech, and conscious responses. It interprets sensory information, makes decisions, and coordinates motor activities.
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Question 64
Which of the following statement describes an autonomic nervous system
The autonomic nervous system controls involuntary functions of the body, regulating activities of glands, cardiac muscle, and smooth muscles without conscious control, ensuring vital processes such as heart rate, digestion, and glandular secretions.
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Question 65
The glomerular filtrate contains the following except
Glomerular filtrate is the fluid filtered from blood into the Bowman's capsule. It contains water, salts, glucose, and urea but excludes blood cells and large proteins, which remain in the bloodstream.
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Question 66
One of the following is not the theory of natural selection stated by Charles Darwin
Darwin's theory of natural selection does not include the inheritance of acquired characteristics. Instead, it focuses on naturally occurring variations, survival of the fittest, and differential reproductive success shaping species over generations.
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Question 67
Ecology is best defined as the study of
Ecology is the branch of biology that studies the relationships between organisms and their physical, chemical, and biological environment. It examines energy flow, nutrient cycling, and interactions shaping ecosystems.
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Question 68
The following processes are involved during expiration in man except
During expiration, the thoracic cavity decreases in volume as the intercostal muscles relax, ribs move downwards and inwards, and the sternum moves inward. The statement about volume increasing is incorrect for normal exhalation.
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Question 69
Which of the following is an example of continuous variation?
Continuous variation refers to traits that show a range of small differences, such as height, weight, or skin color in humans, rather than distinct, discrete categories like blood groups or sex differences.
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Question 70
One of the following is an effect of clay soil on vegetation
Clay soil retains water and nutrients well, providing an environment that supports dense, luxuriant vegetation like forests. Its fine particles hold minerals effectively, promoting the growth of nutrient-demanding plants.