Age Distribution Pyramids
Human Population of Class 12
Age Distribution Pyramids
3 age groups are selected for constructing age pyramids:
- Pre-reproductive age (0 –14 years)
- Reproductive age (15 –60 years)
- Post reproductive age (> 60 years)
There are 3 - types of pyramids
- Triangular
- Bell-shaped
- Urn-shaped
Triangular Pyramid - indicates expanding population with high growth rate
Bell-shaped Pyramid - indicates stable population with zero growth rate.
Urn-shaped Pyramid - indicates declining population with negative growth rate.
(A) Triangular pyramid
(B) Bell-shaped pyramid
(C) Urn shaped pyramid
