Human population growth Knowledge-Based Download PDF

Questions

1. 1.

   Replacement-level fertility in human populations is generally estimated at approximately 2.1 children per woman rather than exactly 2.0. Which of the following factors primarily accounts for why this value must exceed 2.0 to ensure generation-to-generation replacement?

   • A) Infant and childhood mortality prevent some females from reaching reproductive age, and the natural sex ratio at birth slightly favors males.
   • B) Increasing global life expectancy causes post-reproductive individuals to continuously outnumber reproductive cohorts.
   • C) Advanced healthcare systems have shifted the human sex ratio at birth so that significantly more females are born than males.
   • D) Net global emigration rates permanently deplete reproductive-age individuals from the planetary breeding population.
2. 2.

   An age structure diagram of a human population that features a wide, broad base tapering sharply toward the apex indicates which of the following demographic conditions?

   • A) A high proportion of prereproductive individuals, predicting rapid future population growth
   • B) A zero-growth demographic state characterized by equal birth and mortality rates across all cohorts
   • C) A contracting population dominated by postreproductive individuals due to sub-replacement fertility
   • D) A uniform distribution of individuals between prereproductive, reproductive, and postreproductive age classes
3. 3.

   Unlike most natural populations whose growth is restricted by relatively fixed environmental limits, the global human population has experienced rapid, exponential growth over the past few centuries. Which factor has primarily enabled this sustained expansion by repeatedly raising human carrying capacity?

   • A) An evolutionary increase in intrinsic human biotic potential and natural reproductive rate
   • B) A biological transition from a Type I toward a Type III survivorship curve across modern societies
   • C) Technological and agricultural innovations that enhanced food security, sanitation, and medical care
   • D) A worldwide reduction in per capita resource consumption and ecological footprint
4. 4.

   Which phenomenon explains why a human population can continue to increase in total size for several decades even after its total fertility rate drops to replacement level?

   • A) Population momentum caused by a large proportion of young individuals entering their reproductive years
   • B) Environmental resistance shifting the population growth from an exponential curve to a logistic curve
   • C) An immediate increase in the generation time of post-reproductive age classes
   • D) Negative net migration causing a severe skew in the sex ratio of urban populations
5. 5.

   In the demographic transition model, which of the following demographic changes primarily accounts for the rapid population growth observed during Stage 2 (the transitional stage)?

   • A) A significant rise in birth rates while death rates remain unchanged
   • B) A simultaneous and equal decline in both birth rates and death rates
   • C) A sharp decline in death rates while birth rates remain relatively high
   • D) An increase in total fertility rates triggered by rapid industrialization