Page 69 - Health, Population and Environment Education 9

Population pyramid
Population pyramid is the graphical representation of composition of population by sex
and age together at the same time.

Fig: 3
In population pyramid, there is use of vertical bar and horizontal bars. Vertical bar represents
the age group of population divided with an interval of 5 years (i.e. 0 – 4, 5 – 9, etc). Horizontal
bars represent sex and percentage (%) of population of particular age group.

Types of population pyramid
There are three types of population pyramid. They are as follows:

i. Expansive Pyramid
Expansive pyramid shows the young and growing population. It shows larger number
or percentage (%) of population of younger age group. It has broad base. This type of
pyramid is usually found in countries with very high fertility especially in the developing
countries like Nepal, India, Pakistan, Bangladesh, etc.

Fig: 4
Expansive pyramid
GREEN Environment Population and Health Education Book-9 69