Biology 2011 Jamb Examination
Biology 2011 Jamb Examination
Question 21
In nature, plants and animals are perpetually engaged in mutualism because
Mutualism is a symbiotic relationship where both organisms benefit. Plants produce oxygen and food through photosynthesis, which animals use, while animals release COâ‚‚ and nutrients used by plants. Hence, they utilize each other's respiratory wastes.
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Question 22
In an experiment to determine the percentage of humus and water in a soil sample, the following results were obtained
Weight of the evaporating basin alone = 80.5g
Weight of basin and soil = 101.5g
Weight after drying the soil in the oven = 99.0g
Weight of basin and roasted soil = 95.5g
The percentage of humus in the soil sample is
Weight of soil = 101.5 - 80.5 = 21.0g
Weight of water = 101.5 - 99.0 = 2.5g
Weight of humus = 99.0 - 95.5 = 3.5g
Percentage of humus = (3.5 / 21.0) × 100 = 16.67%
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Question 23
An example of a filter-feeding animal is
Filter feeders are animals that feed by straining suspended matter and food particles from water. Whales (specifically baleen whales) are classic filter feeders.
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Question 24
Which of the following is a feature of the population pyramid of a developing country?
Developing countries typically have high birth rates, high death rates, and a lower average lifespan, reflected in a broad base and narrow top of the population pyramid. Therefore, short lifespan is a feature.
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Question 25
The interaction of a community of organisms with its abiotic environment constitutes
An ecosystem includes all living organisms (community) interacting with the abiotic components of their environment.
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Question 26
The vector of the malaria parasite is
Malaria is transmitted by the bite of the female Anopheles mosquito. Aedes transmits yellow fever and dengue, while Culex transmits filariasis.
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Question 27
Which of the following instruments is used to measure relative humidity?
A hygrometer is specifically designed to measure the relative humidity of the air. Thermometer measures temperature, hydrometer measures density, and anemometer measures wind speed.
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Question 28
Exo-erythrocytic phase of the life cycle of malaria parasite occurs in the
The exo-erythrocytic phase occurs in the liver of humans where the sporozoites multiply before entering red blood cells. Reticuloendothelial cells and brain are not sites for this stage, and Malpighian tubules are in mosquitoes.
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Question 29
Habitats are generally classified into
Habitats are classified by their environment into aquatic (water) and terrestrial (land) habitats. Biotic and abiotic refer to components of ecosystems, not habitat types.
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Question 30
Drancunculiasis can be contacted through
Dracunculiasis (Guinea worm disease) is contracted by drinking water contaminated with copepods that carry the larvae of Dracunculus medinensis.
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