Members of a population are arranged as per their age group. Select the expanding population from the following situations.

Pre-reproductive age > Reproductive age > Post reproductive age

The correct answer is Option (3) → Pre-reproductive age > Reproductive age > Post reproductive age 

Expanding population pyramid

A population pyramid that is very wide at the younger ages, with a high birth rate and perhaps low life expectancy therefore leading to high death rate.The population is said to be fast-growing, and the size of each birth cohort increases each year.

Stable population pyramid

A pyramid can be described as stationary if the percentages of population (age and sex) remain approximately constant over time.In a stationary population, the numbers of births and death roughly balance one another.

Declining population pyramid

A population pyramid that is narrowed at the bottom. The population is generally older on average.Urn-shaped age pyramids exhibit low numbers or percentages of pre-reproductive individuals, a maximum number of individuals in the reproductive age group, and a small number of individuals in the post-reproductive age group. Such a population is considered to decline.

                                         Representation of age pyramids for human population