Draw neat, labelled diagram : Pyramids of underdeveloping countries.

Answer: [Diagram: a triangular (expansive) age-sex pyramid with a broad base and narrow pointed top.]

Draw a vertical axis in the centre showing age groups (0–4, 5–9, … 80+) from bottom to top. Males are drawn on the left and females on the right as horizontal bars, with percentage of population on the horizontal axis. Label: Age groups, Male, Female, Percentage of population.

• Very wide base: high birth rate, large proportion of children.
• Sides narrow quickly upwards: high death rate.
• Narrow, pointed top: few old people, low life expectancy.
• Examples: Niger, Nigeria, Afghanistan.