Question

a) Label the three tiers $1$, $2$, $3$ given in the above age pyramid.

b) What type of population growth is represented by the above age pyramid?

Answer 1

Age pyramid:

The graphical representation of the age composition of a specific population is called the age pyramid.


Fig : Age pyramid

Age groups in human population:

The different age groups are represented by each tier in an age pyramid. The major age groups are pre-reproductive, reproductive and post-reproductive.
Tier 1 represents a pre-reproductive age group.
Tier 2 represents the reproductive age group. The individuals in this population are reproductively mature.
Tier 3 represents a post-reproductive age group.



Final answer 1: Pre-reproductive
2: Reproductive
3: Post-reproductive

Type of population growth:

In the given age pyramid, the pre-reproductive population is more than the post-reproductive population. This type of population growth is called expanding because individuals in the pre-reproductive age group will soon become reproductively mature. They will reproduce and the population size will increase.


Final answer Expanding population