Biology 2018 Jamb Examination
Biology 2018 Jamb Examination
Question 71
Which of the following cycles involves the process of precipitation and transpiration?
The water cycle involves the continuous movement of water through precipitation, evaporation, and transpiration. Precipitation returns water to the earth, while transpiration from plants contributes to atmospheric moisture, maintaining the global water balance.
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Question 72
What is the critical limiting factor for plants below the photic zone in an aquatic ecosystem?
Light intensity is the critical limiting factor for plants below the photic zone, as sunlight cannot penetrate deeply. Without sufficient light, photosynthesis is limited, restricting plant growth and productivity in these lower layers of aquatic ecosystems.
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Question 73
Which of the following instruments is used to estimate the number of plants in a habitat?
A quadrant is a square or rectangular sampling frame used to estimate plant density, frequency, and distribution within a habitat. It allows ecologists to quantify plant populations systematically and obtain accurate data on species abundance.
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Question 74
Which of the following statements is true about sandy soil?
Sandy soil is light and easy to dig because its particles are large and loosely packed. This allows good aeration and rapid drainage, making it different from clayey soil, which is heavy, compact, and poorly aerated.
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Question 75
Which of the following organisms is a primary consumer?
A sheep is a primary consumer because it feeds directly on plants, which are producers. Primary consumers occupy the second trophic level in a food chain, obtaining energy by consuming autotrophic organisms.
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Question 76
Study the diagram of a food chain shown and use it to answer the question.
P ---> Q ---> R ---> S ---> T
The organism designated P in the food chain above is normally sustained by energy from
P ---> Q ---> R ---> S ---> T
The organism designated P in the food chain above is normally sustained by energy from
Organism P in the food chain is a producer that synthesizes its own food through photosynthesis. It captures energy directly from sunlight and converts it into chemical energy, which supports all subsequent consumers in the food chain.
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Question 77
Study the diagram of a food chain shown and use it to answer the question.
P ---> Q ---> R ---> S ---> T
Which of the following statements best describes the organism designated R? It
P ---> Q ---> R ---> S ---> T
Which of the following statements best describes the organism designated R? It
Organism R is a secondary consumer because it feeds on Q, which is a primary consumer. Secondary consumers occupy the third trophic level in a food chain, obtaining energy indirectly from producers through primary consumers.
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Question 78
Which of the following diseases is not hereditary?
Scabies is not hereditary; it is a contagious skin disease caused by a parasitic mite, Sarcoptes scabiei. In contrast, albinism, haemophilia, and colour blindness are genetic disorders inherited from parents through specific gene mutations.
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Question 79
The immediate product of meiosis in flowering plants is the
The immediate product of meiosis in flowering plants is the pollen grain in males and the embryo sac in females. These haploid cells are gametophytes, which develop into gametes necessary for sexual reproduction.
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Question 80
DNA in eukaryotic cells is contained in the
In eukaryotic cells, DNA is stored in the nucleus, a membrane-bound organelle. The nucleus protects genetic material, regulates gene expression, and controls cellular activities such as growth, metabolism, and reproduction.
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