Biology 2019 Jamb Examination
Biology 2019 Jamb Examination
Question 31
Rabbits cannot survive in an aquatic habitat because they have
Rabbits are terrestrial animals that lack gills, which are essential for extracting oxygen from water. Without gills, they cannot respire underwater, making survival in aquatic habitats impossible.
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Question 32
Which of the following substances pass through the root cell membrane by osmosis?
Osmosis is the passive movement of water across a selectively permeable membrane. Water moves from areas of higher water potential in the soil into the root cells, allowing plants to absorb essential hydration.
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Question 33
Trees in Savanna habitats usually have thick bark which mainly
Thick bark reduces water loss by slowing down transpiration and helps the tree conserve moisture in hot, dry Savanna conditions. This adaptation is crucial for survival during prolonged dry periods.
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Question 34
Competition among individuals of a population increases the
Competition for limited resources such as food, water, and space leads to natural selection, where only the fittest individuals survive and reproduce, increasing the overall adaptability and strength of the population.
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Question 35
In natural selection, Darwin proposed that evolution occurred because of the following conditions except
Darwin emphasized that resources are limited, leading to competition and the elimination of weaker individuals. The idea that food is abundant contradicts his theory, as scarcity drives natural selection and evolutionary change.
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Question 36
Which of the following substances has the highest amount of energy in joules per unit weight?
Fats store more energy per gram than carbohydrates or proteins because of their dense chemical structure with long hydrocarbon chains. They serve as long-term energy reserves in organisms.
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Question 37
Which of the following pairs of scientists discovered the Rhesus factor in human blood?
Karl Landsteiner and Alexander S. Wiener discovered the Rhesus (Rh) factor, a critical antigen in blood transfusions that determines compatibility between donors and recipients, helping prevent transfusion reactions.
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Question 38
The study of an individual organism or a single species of organism and its environment is
Artecology focuses on the interactions of a single species with its environment, studying its behavior, distribution, and adaptations, which helps understand survival strategies and ecological roles of individual species.
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Question 39
Which of the following is a nitrifying bacterium?
Nitrobacter is a nitrifying bacterium that converts nitrites to nitrates in the nitrogen cycle, playing a crucial role in soil fertility and making nitrogen available to plants for growth and metabolism.
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Question 40
Which of the following is the effect of using artificial pollination in plant breeding?
Artificial pollination allows breeders to control fertilization and combine desirable traits from different plants, resulting in improved crop varieties with enhanced yield, quality, and resistance to environmental stresses.
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Select the pair of words.
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