Biology 2020 Jamb Examination
Biology 2020 Jamb Examination
Question 21
The ability of the eyes to focus on both near and distance objects is termed
Accommodation is the process by which the eye's lens changes shape to focus light on the retina, enabling clear vision of objects at varying distances, both near and far.
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Question 22
A group of organism of different species living in a particular area is described as a
A community comprises populations of different species living and interacting in the same habitat. These interactions shape ecosystem dynamics and contribute to ecological balance.
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Question 23
The biological association that contributes directly to succession in a community is
Competition drives natural selection and succession, as species compete for resources, leading to changes in population structure and gradual replacement of less adapted species.
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Question 24
Floating microscopic heterotrophs are mostly grouped as
Zooplankton are microscopic heterotrophic organisms drifting in water, feeding on phytoplankton or other small particles. They are essential in aquatic food webs.
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Question 25
Vaccination is carried out in order to
Vaccination introduces a harmless form of a pathogen to stimulate the immune system, prompting the production of antibodies, which provide immunity against future infections.
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Question 26
For growth to occur in organisms, the rate of
Growth occurs when anabolic processes, which build complex molecules, exceed catabolic processes that break down molecules for energy. This net accumulation of materials supports tissue and organ development.
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Question 27
The probability of a baby being a boy or a girl depends on the contribution of the
The father's sperm determines the baby's sex because it can carry either an X or Y chromosome. The combination with the mother's X chromosome produces a male (XY) or female (XX).
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Question 28
Both recesssive and dominant characters are found
Dominant and recessive alleles occupy the same locus on homologous chromosomes. This arrangement allows the expression of one allele over the other in heterozygous individuals.
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Question 29
In a population of living things, the parameters of size, height, weight and colours are examples of
Continuous variation shows a range of small differences, such as height, weight, and size. These traits are usually polygenic and influenced by environmental factors, producing gradual variation.
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Question 30
Use the diagram to answer the question.
The process of water loss and intake indicated by the arrows labelled i and ii are respectively
In plants, water intake occurs via osmosis (arrow ii) through root cells due to concentration gradients, while water loss (arrow i) occurs through exhalation/transpiration, maintaining water balance.
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