Biology 2016 Jamb Examination
Biology 2016 Jamb Examination
Question 21
The activity of ptyalin is likely to decrease with an increase in the concentration of
Ptyalin is an enzyme that acts optimally in a near-neutral pH. Increasing acidity denatures the enzyme, reducing its activity and slowing the breakdown of starch into simpler sugars in the mouth.
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Question 22
Seed plants are divided into
Seed plants are classified into gymnosperms and angiosperms. Gymnosperms bear naked seeds without flowers, while angiosperms produce seeds enclosed in fruits, demonstrating evolutionary advancement in reproduction.
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Question 23
The adaptive importance of the nuptial flight from termite colonies is to
The nuptial flight allows winged reproductive termites to leave their parent colony, mate, and establish new colonies. This ensures gene flow, reduces inbreeding, and increases survival chances of the species.
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Question 24
The sequence of the one-way gaseous exchange mechanism in a fish is
In fish, water enters through the mouth, passes over the gills where gas exchange occurs, and exits via the operculum. This unidirectional flow maximizes oxygen uptake efficiency in aquatic environments.
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Question 25
The theory of use and disuse of organs was promulgated by
Jean Lamarck proposed that organs and structures develop or weaken depending on their use. Traits acquired or lost during an organism's lifetime could be inherited, forming the basis of his evolutionary theory.
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Question 26
The theory of natural selection was postulated by
Charles Darwin proposed natural selection as the primary mechanism of evolution, where organisms with advantageous traits survive and reproduce, gradually shaping populations over generations and driving adaptive evolution.
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Question 27
The movement response of a cockroach away from a light source is
Negative phototaxis occurs when an organism moves away from light. Cockroaches exhibit this behavior to avoid predators and desiccation, showing an adaptive response that increases survival in dark or concealed environments.
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Question 28
Which of the following can cause shrinkage of living cells?
Hypertonic solutions have a higher solute concentration than the cell interior, causing water to move out of cells via osmosis. This leads to cell shrinkage, a process also known as plasmolysis in plant cells.
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Question 29
The ability of chameleon to change its colour rapidly is an adaptation for
Chameleons change color rapidly as a survival adaptation to avoid predators. This camouflage allows them to blend into surroundings, reducing visibility and increasing chances of survival in predator-rich environments.
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Question 30
Which of the following is NOT a method of conserving wild life?
Indiscriminate poaching involves hunting animals without regulation and is detrimental to wildlife populations. Conservation methods aim to protect species through reserves, laws, and managed care in zoological gardens.
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