Human population growth Knowledge-Based Practice

Questions

1. 1.

   In human demography, why is replacement-level fertility typically estimated at approximately 2.1 children per woman rather than exactly 2.0?

   • A) Because women naturally have a longer reproductive lifespan than men in most human societies.
   • B) Because net emigration constantly reduces total population size unless counterbalanced by surplus births.
   • C) Because the rate must generate excess births to compensate for adults who voluntarily choose not to reproduce.
   • D) Because some female children die before reaching reproductive maturity, and slightly more males than females are born worldwide.
2. 2.

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

   • A) The Allee effect
   • B) Carrying capacity overshoot
   • C) Population momentum
   • D) Environmental resistance
3. 3.

   Which factor has primarily enabled the global human population to exhibit prolonged exponential growth over the past few centuries rather than leveling off at a fixed carrying capacity?

   • A) Technological, agricultural, and medical innovations that progressively expanded Earth's carrying capacity for humans
   • B) A biological increase in the intrinsic biotic potential and maximum litter size of the human species
   • C) The complete eradication of all density-independent environmental limiting factors across global ecosystems
   • D) An evolutionary shift from a K-selected life history strategy toward an r-selected reproductive strategy
4. 4.

   In human population ecology, which characteristic of an age-structure diagram is most indicative of rapid future population growth?

   • A) A columnar shape with roughly equal proportions across pre-reproductive and reproductive age classes
   • B) An inverted pyramid with a significantly higher proportion of post-reproductive individuals
   • C) A broad base reflecting a large proportion of individuals in the pre-reproductive age category
   • D) A constricted base indicating a rapid decrease in birth rates relative to adult survival
5. 5.

   During the demographic transition of human populations, which change in vital rates directly drives the rapid population growth characteristic of Stage 2?

   • A) A significant decline in death rates while birth rates remain high
   • B) A substantial increase in birth rates while death rates remain constant
   • C) A simultaneous increase in both birth rates and emigration rates
   • D) An immediate drop in birth rates while death rates continue to rise

Answers and step-by-step solutions appear after you finish the test.