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Organisms and Populations Test - 16

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Organisms and Populations Test - 16
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  • Question 1
    1 / -0
    Mark the correct statement.
    Solution
    Correct Answer: B
    Explanation:

    • Birth rate or natality is defined as the total number of live births per 1,000 of a population in a year.
    • It is the number of births per unit population per unit time. 
    • It differs from the population growth rate as it is never negative while the growth rate can be negative. 
    • So, the correct answer is option B.
  • Question 2
    1 / -0
    Population density refers to
  • Question 3
    1 / -0
    What is natality?
  • Question 4
    1 / -0
    In nutritional relationship one organism benefits while the other is neither harmed nor benefited is
    Solution

  • Question 5
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    Which of the following components of biosphere makes an interface with the soil?
  • Question 6
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    A relationship in which two organisms get benefit from their association is called as
    Solution
    Mutualism is a mutually beneficial relationship between individuals of two different species. None of the two is capable of living separately. Mutualism is generally considered to be obligatory e.g., nitrogen fixing Rhizobium bacteria living in root nodules of leguminous plants, mycorrhizae (Fungus) living in association with roots of higher plants like Gymnosperms and Lichens, which are a symbiotic association between an algal component (phycobiont) and a fungal component (mycobiont).
    Thus, the correct answer is option 'Mutualism'.
  • Question 7
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    Which of the following is the correct representation of mutualsim among species?
  • Question 8
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    Mortality is also known as 
    Solution
    The rate of loss of individuals per unit time due to death is known as Mortality. The mortality rate is a measure of the number of deaths (in general, or due to a specific cause) in a particular population, scaled to the size of that population, per unit of time. It is typically expressed in units of deaths per 1,000 individuals per year.
    So, the correct answer is option A.
  • Question 9
    1 / -0
    An example of mutualism is
    Solution
    Lichen is an example of mutualism. It is the association of fungi and algae in which algae synthesizes food for fungi by photosynthesis while fungi provide shelter to the algae.
    Tapeworm and Nematodes live as parasites in the intestine of humans and nourish themselves by living on the tissue.
    Bread mold is an example of saprophytism in which it derives its nutrition by the decomposition or decay of bread.
    Epiphytes are the plants that grow on other plants and derives nutrition from the air and water surrounding it.
    Hence, 'Lichens' is the correct option.
  • Question 10
    1 / -0
    The enzyme utilized by microbes for the metabolization of cell wall of wood of termites is
    Solution

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