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    Home MCQ examination Jamb Biology 2009

    Biology 2009 Jamb Examination

    Biology 2009 Jamb Examination
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    Question 21

    In fresh water marshes and swamps, the most important abiotic factors that organisms have to adapt to is?
    Show explanation Expand Question
    The waterlogged substratum is the major abiotic factor organisms must adapt to in swamps and marshes.
    Not clear enough?

    Question 22

    Which of the following biomass could be characterized by very low rainfall,cold nights, hot days, and fast blooming plants?
    Show explanation Expand Question
    Tropical deserts are characterized by low rainfall, extreme temperatures, and rapid plant blooming.
    Not clear enough?

    Question 23

    Mass of crucible = 10g Mass of crucible and soil before heating = 29g Mass of a crucible and soil after heating = 18g From the information above, determine the percentage of water in the given soil sample?
    Show explanation Expand Question
    Given data: Mass of crucible = 10 g

    Given data
    Mass of crucible = 10 g
    Mass of crucible with soil (before heating) = 29 g
    So, mass of soil before heating = $29 - 10 = 19 \, \text{g}$
    Mass of crucible with soil (after heating) = 18 g
    Thus, mass of soil after heating = $18 - 10 = 8 \, \text{g}$
    Water lost during heating = $19 - 8 = 11 \, \text{g}$
    Percentage of water content =

    $$\dfrac{\text{Water lost}}{\text{Original soil mass}} \times 100 = \dfrac{11}{19} \times 100= 57.89\%$$

    This is approximately 60%.

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    Question 24

    I. Onchocerciasis II. Schistosomiasis III.Salmonellosis IV. Meningitis which of the diseases listed above are associated with water?
    Show explanation Expand Question

    • Onchocerciasis (River Blindness):
      Caused by Onchocerca volvulus worm. Spread by black fly bites near fast-flowing rivers. Symptoms: itching, skin nodules, possible blindness.

    • Schistosomiasis (Bilharzia):
      Caused by schistosome worms. Infection occurs when skin contacts freshwater containing snails that carry the parasite.

    • Salmonellosis:
      Bacterial infection (Salmonella). Found in animal intestines. Transmitted mainly through contaminated food or water.

    • Meningitis:
      Inflammation of brain and spinal cord membranes (meninges). Symptoms: fever, headache, stiff neck.

      • Fungal type: spread by inhaled spores in dust.

      • Vector-borne type: spread by mosquitoes (West Nile virus) or ticks (Lyme disease).

      • Bacterial type: person-to-person via droplets, close contact, sneezing, coughing, kissing, or living together.

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    Question 25

    The major cause of global warming is the?
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    Burning fossil fuels releases greenhouse gases, the primary cause of global warming.
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    Question 26

    The uniqueness of an individual organism in a population is accounted for by?
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    Variation among individuals accounts for their uniqueness in a population.
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    Question 27

    A phenotypic character with intermediate forms that can be graded from one extreme to the other is referred to as?
    Show explanation Expand Question
    Continuous variation shows intermediate forms that can be graded between extremes, such as height.
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    Question 28

    A farmer's assumption that the seed from a good harvest will produce a good yield is explained by the theory of
    Show explanation Expand Question
    Heredity explains how characteristics, such as yield, are passed from one generation to the next.
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    Question 29

    The nephridia in the earthworm form part of the?
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    Nephridia are excretory organs in earthworms that remove metabolic waste.
    Not clear enough?

    Question 30

    A woman with the ability to roll her tongue (Tt) marries a man who cannot roll his tongue(tt). what is the probability of each of their children being a tongue roller?
    Show explanation Expand Question
    Cross Tt × tt → 50% Tt (rollers), 50% tt (non-rollers). Probability of tongue roller = 50%.
    Not clear enough?
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