Biology 2005 Jamb Examination
Question 41
The importance of practising crop rotation in agriculture is to
A. maintain soil fertility
Crop rotation helps to maintain soil fertility by alternating crops with different nutrient demands. For example, legumes fix nitrogen, enriching the soil for subsequent crops, while rotation also helps reduce pests and diseases associated with continuous monocropping.
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Question 42
The recycling method of solid waste disposal is unsuitable for
A. organic matter
Recycling is best suited for glass, plastics, and metals, which can be reprocessed into new products. Organic matter, on the other hand, is not recycled but rather composted or used for manure to improve soil fertility.
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Question 43
A non - renewable alternative source of energy is
C. nuclear energy
Nuclear energy is considered a non-renewable alternative source because it relies on finite uranium and other radioactive fuels, which cannot be replenished once depleted. In contrast, wind, solar, and hydroelectric power are renewable sources.
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Question 44
Which of the following is the best explanation for a child who is phenotypically short and born of two tall parents
D. Both parents possess gene for shortness
This happens because shortness is controlled by a recessive gene. Both parents may be tall but carry the recessive allele; when the child inherits both recessive alleles, they become phenotypically short.
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Question 45
A yellow maize is crossed with a white maize and the first filial generation produce yellow maize only. The white trait is said to exhibit
B. recessiveness
Since the cross produced only yellow maize in the F₁ generation, it means the yellow trait is dominant while the white trait is recessive.
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Question 46
The association in which one member benefits and the other is relatively unaffected by the interaction is termed
C. commensalism
Commensalism is an association where one organism benefits while the other is neither harmed nor benefited.
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Question 47
When a peacock displays its colourful feathers, it is
D. courting a female
A peacock displays its colourful feathers as a courtship behavior to attract a female mate.
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Question 48
When an animal has a dark-coloured dorsal surface and a light-colouration ventral surface, this is an adaptation called
B. countershading
Countershading is the adaptation in which animals have a dark dorsal surface and a lighter ventral surface, helping them blend with their surroundings and avoid predators.
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Question 49
The only caste in the termite colony whose members can feed themselves are the
A. reproductives
In a termite colony, only the reproductives (king and queen) can feed themselves, while workers feed soldiers, nymphs, and other members.
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Question 50
An evidence of a common ancestral for fishes, amphibians, reptiles, birds and mammals is the
C. presence of gill clefts in vertebrate embryos
Gill clefts appear in the embryonic stages of all vertebrates, showing evidence of common ancestry.
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