What is the Age pyramid? What are the different types of age pyramids?
In a population of an organism, the geometrical diagrammatic representation of different age groups is referred to as the Age of pyramids. These are of three types:- i) Expanding pyramid:- It is a broad-based, triangular pyramid that represents a population containing a large number of young people. It is a rapidly expanding population with a high birth rate. ii) Stable pyramid:- A moderate proportion of young to old is represented by this pyramid. As the rate of growth becomes slow & stable i.e.- pre-reproductive & reproductive age groups become more or less equal in size. iii) Declining Pyramid:- The type of pyramid of population decreasing in size is characterized by a narrow base because there are fewer pre-reproductive individuals than in the other two age categories.
