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Consider the following statements regarding the density of a population. 1. Natality refers to the number of births during a given period in the population that are added to the initial density. 2. Mortality is the number of deaths in the population during a given period.  Which of the statements given above is/are correct?

Consider the following statements regarding the density of a population. 1. Natality refers to the number of births during a given period in the population that are added to the initial density. 2. Mortality is the number of deaths in the population during a given period.  Which of the statements given above is/are correct? Correct Answer Both 1 and 2

The correct answer is Both 1 and 2.

Key Points

  • 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. 
  • Whatever might be the ultimate reasons, the density of a population in a given habitat during a given period fluctuates due to changes in four basic processes, two of which (natality and immigration) contribute to an increase in population density and two (mortality and emigration) to a decrease.
    • Natality refers to the number of births during a given period in the population that are added to the initial density. Hence, Statement 1 is correct.
    • Mortality is the number of deaths in the population during a given period. Hence, Statement 2 is correct.
    • 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.

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