Question

Which one of the following population attributes, contributes to increase in population density?

• A. Natality and Emmigration
• B. Mortality and Immigration
• C. Natality and Immigration
• D. Mortality and Emmigration

Hint:

Natality (births) and Immigration (influx) are the primary factors that boost population density.

Answer 1

The Correct Option is C

• Definition of Population Density: Population density increases when the number of individuals in a given area rises, influenced by birth (natality) and entry (immigration) rates, and decreases with death (mortality) and exit (emigration) rates.
• Option Analysis:
  • (1) Natality and Emmigration: Natality increases population, but emigration (leaving) decreases it, leading to a net neutral or negative effect. This is incorrect.
  • (2) Mortality and Immigration: Mortality decreases population, while immigration increases it, resulting in a net neutral or negative effect. This is incorrect.
  • (3) Natality and Immigration: Both natality (births within the population) and immigration (new individuals entering) add to the population, increasing density. This is correct.
  • (4) Mortality and Emmigration: Both mortality (deaths) and emigration (leaving) reduce population size, decreasing density. This is incorrect.
• Mechanism Insight: Population growth occurs when the birth rate (natality) and influx of individuals (immigration) exceed death rate (mortality) and outflow (emigration).
• Conclusion: The correct answer is (3) Natality and Immigration, as both contribute to an increase in population density.