Make a correct sequence of age-sex Pyramids in ascending order in relation to the development:-

A. Declining Populations
B. Ageing Populations
C. Expanding Populations
D. Constant Populations

Choose the correct answer from the options given below:

C, D, A, B

Expanding Populations: The age-sex pyramid of Nigeria as one can see is a triangular shaped pyramid with a wide base and is typical of less developed countries. These have larger populations in lower age groups due to high birth rates.

Constant Population: Australia’s age-sex pyramid is bell shaped and tapered towards the top. This shows birth and death rates are almost equal leading to a near constant population.

Declining Populations: The Japan pyramid has a narrow base and a tapered top showing low birth and death rates. The population growth in developed countries is usually zero or negative.

Population ageing is the process by which the share of the older population becomes proportionally larger. This is a new phenomenon of the twentieth century. In most of the developed countries of the world, population in higher age groups has increased due to increased life expectancy. With a reduction in birth rates, the proportion of children in the population has declined.