The document discusses population pyramids and their shapes. It explains that a population pyramid studies the age and sex composition of a population and resembles a pyramid shape. The bars show different age groups with males on the left and females on the right. Expanding populations have a more triangular shape with high birth and death rates, while constant populations are bell shaped with equal birth and death rates. Declining populations have a narrow base and tapered top, indicating low birth and death rates common in developed countries. Examples of different pyramid shapes for Nigeria, Australia, and Japan are provided.

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2. AGE – SEX
PYRAMID
Prepared by-:Yatendra awana

3. •It studies the age and sex composition of
Population.
•Resembles the shape of pyramid , termed as
Pyramid diagram.
•Show age and sex structure of population.
•The bars show different age groups , males on the
left and females on the right.

4. Expanding population
 More or lessTriangular in shape.
 High Birth rate.
 High Death rate.
 Typical of less developed
countries.

5. NIGERIA, 2003

6. Constant population
 Bell shaped pyramid.
 Birth rate almost equal to death
rate
 Constant population.

7. AUSTRALIA, 2003

8. Declining population
 Pyramid with narrow base ,
tapered top and bulging middle.
 Low Birth and Death Rate.
 Indication of Developed countries.

9. JAPAN, 2003

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