a) What are Age Pyramids?
Name three representative kinds of age pyramids for human population
and let the characteristics for each of them
Answers
Explanation:
A population pyramid, also called an "age-sex- pyramid", is a graphical illustration that shows the distribution of various age groups in a population (typically that of a country or region of the world), which forms the shape of a pyramid when the population is growing.There are basically three types of age pyramids found to be present in human population. These are as follows: (i) Expanding or Triangular Age Pyramid : In this, number of pre-reproductive individuals is very lar ge, number of age reproductive individuals is moderate, while post-repr oductive individuals are fewer.A population pyramid that is very wide at the younger ages, characteristic of countries with high birth rate and low life expectancy. The population is said to be fast-growing, and the size of each birth cohort gets larger than the size of the previous year. A population pyramid that is narrowed at the bottom.