Question
Biology Question on organisms and populations
What type of human population is represented by the following age pyramid?
A
vanishing population
B
stable population
C
declining population
D
expanding population.
Answer
declining population
Explanation
Solution
The age pyramid is a graphic representation of the abundance of individuals of various age groups with -
Pre-reproductive individuals at the base.
Reproductive individuals in the middle.
Post-reproductive individuals at the top.
- The triangular age pyramid has a high proportion of pre-reproductive individuals, fewer post-reproductive individuals, and a moderate number of reproductive individuals. It represents a rapidly growing population.
- In a bell-shaped age pyramid, the number of pre-reproductive and reproductive individuals is almost equal while the post-reproductive individuals are comparatively fewer. It represents a stationary population where the growth rate is nearly zero.
- In an urn-shaped age pyramid, the number of reproductive individuals is higher than the number of pre-reproductive individuals. It represents a declining or diminishing population.
Hence, option C) is the correct answer.