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    Read the following passage and answer the questions: The size of a population for any species is not a static parameter. It keeps changing with time,

    Reading Comprehension

    Read the following passage and answer the questions:
    The size of a population for any species is not a static parameter. It keeps changing with time, depending on various factors including food availability, predation pressure and adverse weather. In fact, it is these changes in population density that give us some idea of what is happening to the population – whether it is flourishing or declining. A population at any given time is composed of individuals of different ages. If the age distribution is plotted for the population, the resulting structure is called an age pyramid

    1) Question

    What can be said about the growth status of a population if the age pyramid is as follows:

    A.

    Expanding

    B.

    Stable

    C.

    Declining

    D.

    None of the above

    Correct option is B

    2) Question

    Which of the following is essential for the unimpeded growth of a population?

    A.

    Food

    B.

    Space

    C.

    Resources

    D.

    All of the above

    Correct option is D

    food and space availability is obviously essential for the unimpeded growth of a population. Ideally, when resources in the habitat are unlimited, each species has the ability to realise fully its innate potential to grow in number, as Darwin observed while developing his theory of natural selection. Then the population grows in an exponential or geometric fashion.

    3) Question

    Which of the following population interaction is represented by following?

    A.

    Commensalism

    B.

    Parasitism

    C.

    Ammensalism

    D.

    Competition

    Correct option is C

    In amensalism, one species is harmed whereas the other is unaffected.

    4) Question

    In which of the following case the population would decrease?

    A.

    Natality and immigration

    B.

    Natality and Mortality

    C.

    Mortality and emigration

    D.

    All of the above

    Correct option is C

    Natality refers to the number of births during a given period in the population that are added to the initial density. Mortality is the number of deaths in the population during a given period. Immigration is the number of individuals of the same species that have come into the habitat from elsewhere during the time period under consideration. Emigration is the number of individuals of the population who left the habitat and gone elsewhere during the time period under consideration.

    5) Question

    If in a park there were 20 Hibiscus plants last year and through reproduction 8 new plants are added, making the current population to 28, then what would be the birth rate?

    A.

    0.1

    B.

    0.2

    C.

    0.3

    D.

    0.4

    Correct option is D

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