6/25/2023 0 Comments Practice ib geography tests coreMany LEDCs have a high number of young dependants, whilst many MEDCs have a growing number of elderly dependants.Dependants rely upon the economically active for economic support.There are two groups of dependants young dependants (aged below 15) and elderly dependants (aged over 65). A population pyramid tells us how many dependants there are.It gives us information about birth and death rates as well as life expectancy.The shape of a population pyramid can tell us a lot about an area's population.Key things to know about population pyramids Our Changing Planet (Planet Geography Book 1) (Kindle Locations 2155-2172). This has important implications for future population growth in these nations as the young peopleĬodrington, Stephen. Developing countries tend to have population structures with a wide base, indicating that a large proportion of the population is below 15 years of age. As a result of the difference in population growth rates in industrialised and developing countries, a contrasting set of population structures has emerged. Countries with wide-based population pyramids have large numbers of children arising from a high fertility rate. Such population pyramids typically have an excess of elderly females over males because females tend to have longer life expectancies than males. A population pyramid with steep vertical sides represents an ageing population with a low birth rate. A population pyramid with a wide base that narrows quickly upwards represents a population with a high birth rate, a high proportion of young people and a rapidly growing population. Population pyramids reflect past and present demographic trends in the population being described. These graphs are known as population pyramids, or age-sex diagrams. In general these graphs show males on the left hand side of the diagram and females to the right. This is often shown as a graph with the number or proportion of each age group shown as horizontal bars from a central vertical column that represents age groups. The structure of a population refers to the age and sex distribution of the population.
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