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Organisms and Populations Test - 44

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Organisms and Populations Test - 44
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  • Question 1
    1 / -0
    One of the following is a positive inter-action in a population
    Solution
    Adamsia is a genus of sea anemones which lives in symbiotic association or shows positive interaction with the Hermit Crab. Adamsia gets food and shelter from crab and in turn help in crab's defense by secreting horny membrane known as carcinoecium on its surface. Plasmodium and mosquito shows commensalism as plasmodium benefits from this interaction whereas mosquito is unharmed. Sacculina and crab shows negative interaction as crab has negative effect of parasitism on sacculina. Similarly, Wuchereria and man shows negative interaction as Wuchereria is a parasitic roundworm that attacks man. 
    Thus, the correct answer is option A.
  • Question 2
    1 / -0
    A wingless blood sucking ectoparasitic insect is
  • Question 3
    1 / -0
    Density of population increases when 
    Solution
    • Density of the population is a number of individuals per unit of area or per unit of volume. It is calculated as a population divided by total land area or water volume. 
    • There are different factors which affects population density such as natality rate, mortality rate, emigration, immigration, age distribution, carrying capacity.
    • Natality rate and immigration increase population density whereas mortality rate and emigration decreases population density.
    Thus, the correct answer is option D.
  • Question 4
    1 / -0
    Which one of the following is categorised as a parasite in true sense? 
    Solution
    Head louse (Pediculus humanus capitis) is an obligate parasite. It causes head lice infestation. Female anopheles is vector and is not a parasite because they do not bite the human. The human foetus is not a parasite because parasite depends on the host for their entire life whereas the foetus is just the developing stage. Cuckoo are brood parasites as they depend on other for their young ones to develop. They are not a true parasite.
    Thus, the correct answer is option C.
  • Question 5
    1 / -0
    There are two optional ways of exploitation. One way is parasitism. Which is the other one?
    Solution
    In exploitation, one species harms the other by making its direct or indirect use for support, shelter or food. In contrast to parasitism where food is derived from the host without killing it, a predator is free living, catches and kills its prey for food. 
  • Question 6
    1 / -0
    At a given time in a forest 900 deer are found, 100 more deer can be accommodated, then 1000 is
    Solution
    Population carrying capacity of any environment is the maximum population size of a species that can have indefinite sustained growth. Here, for the deer being 1000.
    So, the correct answer is 'Population carrying capacity for deer'
  • Question 7
    1 / -0
    The association between symbiotic fungi and higher plant is a 
    Solution
    A mutual relation seen between fungi and roots of higher plants is called as mycorrhiza. The fungi invade the host either extracellularly or intracellularly. Fungal hyphae help in absorption of nutrient and water, while plant provides shelter to the fungal hyphae and nourishment. Sometimes in absence of such a symbiotic relation, the roots of plants may be uprooted. 
    Hence correct answer is option A.
  • Question 8
    1 / -0
    Semilog of per minute growing bacteria is plotted against time. What will be shape graph?
    Solution

    A. Ascending straight line – the graphical representation of the increase in growth. it is the representation of the growth of bacteria per minute.

    B.Sigmoid – Graphical representation of the growth of an organism.

    C.Hyperbolic – Graphical representation of the effect of environmental factors on enzymes.

    D. Descending straight line – The graphical representation of decrease in growth of the organisms.

    So, the correct option is ‘Ascending straight line’.
  • Question 9
    1 / -0
    The correct sequence of growth, curve for bacteria is
    Solution

    The graphical representation of the growth of bacteria is Ascending straight line. It shows Lag, log, decline and stationary stage.

    So, the correct option is ‘Lag, Log, decline and stationary’.
  • Question 10
    1 / -0
    If the number of a species increase in any national park it can be due to
    Solution
    Intraspecific competition is the competition where the members of the same species compete with each other for limited resources. Food, water, space, light, mates or any other resource is the main source of competition. If the number of a species increase in any national park it can be due to less intraspecific competition and increase in the interspecific competition.
    So, the correct answer is option B
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