Biology 2019 Jamb Examination
Biology 2019 Jamb Examination
Question 21
A population is best described as
A population refers to a group of organisms of the same species that occupy a specific area at the same time. They interact with each other, share resources, and contribute to reproduction within the species.
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Question 22
The number of times an organism occurs within a given area of a habitat is referred to as
Population frequency measures how often an individual of a species appears within a designated area. It helps ecologists understand species distribution, abundance, and patterns of dispersion across habitats.
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Question 23
Reading the verdict of a case by a magistrate is an example of
Voluntary actions are consciously controlled by the brain, involving deliberate thought and decision-making. Reading and pronouncing a verdict requires mental effort and cannot occur automatically or as an instinctive reflex.
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Question 24
Which of the following structures controls the activities of the living cell?
The nucleus serves as the control center of the cell. It houses genetic material (DNA) and regulates cellular activities, including metabolism, protein synthesis, growth, and reproduction, ensuring proper functioning of the organism.
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Question 25
Which of the following are components of glomerular filtrate?
Glomerular filtrate contains water, salts, amino acids, and nitrogenous wastes. Plasma proteins and blood cells are not filtered because they are too large, ensuring that essential components remain in the bloodstream.
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Question 26
The sum total of adaptive changes from pre-existing form that have taken place over a long time resulting in diversity of forms, structures and functions among organism is referred to as
Organic evolution describes the gradual development of new species through adaptive changes over time. It explains the diversification of life forms, their structures, and functions resulting from natural selection and environmental pressures.
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Question 27
The specific portion of a habitat which is occupied by a particular species is referred to as
An ecological niche represents the unique role of a species in its environment, including its habitat, food sources, interactions with other species, and contribution to ecosystem function, defining its place within the community.
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Question 28
In plants, respiration occurs in
Respiration in plants occurs in all living cells because they all require energy for metabolism. This includes cells in leaves, stems, and roots, where oxygen is consumed and carbon dioxide is released during respiration.
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Question 29
Which of the following is an example of discontinous variatio?
Discontinuous variation refers to traits that occur in distinct categories rather than a continuous range. Examples include sex determination or blood groups, as seen with male and female offspring, which show distinct, separate forms.
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Question 30
Which of the following type of soil has the highest water retaining capacity?
Clay soil has the highest water retaining capacity due to its very fine particles and small pore spaces, which hold water efficiently. This property makes clay suitable for crops requiring steady moisture, though it drains poorly.
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