18 Questions
Which demographic factor is most directly related to the number of births in a population?
Sex ratio
In a population with an older age structure, which demographic factor would you expect to be higher?
Death rate
What is the term used to describe the statistical study of population changes over time?
Demography
Which of the following demographic factors is used to analyze the age structure of a population?
Cohort analysis
What type of population pyramid would you expect to see in a population with a high birth rate and low death rate?
Expansive
Which of the following demographic factors is most directly related to the future population size of a species?
Birth rate
What does age structure refer to?
The relative number of individuals of each age group in a population
What is a cohort?
The group of individuals of the same age
What do demographers use population pyramids for?
To predict demographic trends in births and deaths
When is the death rate typically highest?
In the first year of life
Which countries are characterized by triangular population pyramids?
Kenya, Nigeria, Saudi Arabia
What do the bottom portions of a population pyramid represent?
Pre-reproductive years
What type of population pyramid is characteristic of a country with a shrinking population or negative growth?
An inverted triangle pyramid
What is generation time strongly related to in a broad range of organisms?
Body size
Which organisms generally have short generation times?
Small organisms
What is a life table used for in ecology and demography?
To access how populations are changing in size
How is a life table constructed?
By following the fate of a cohort from birth until all are dead
What is a survivorship curve used to represent?
The numbers in a cohort still alive at each age
Test your knowledge on age structure, cohorts, birth rate, and their importance in determining demographic factors. Understand how the relative number of individuals of each age affects the rate of births in monogamous pair-bond species.
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