3
Question
The following diagrams are the age pyramids of different populations. Comment on the status of these populations.
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Solution
1)
Age pyramid
The graphical representation of abundance of different age groups in a population is called the age pyramid. The base of the pyramid represents the pre-reproductive group, the middle represents the reproductive group and the top of the pyramid represents the post-reproductive group.
Triangular age pyramid
When the number of pre-reproductive individuals are more, the number of reproductive individuals are moderate and post-reproductive individuals are less, the age pyramid is triangular. This represents a growing population.
Final answer
The age pyramid is triangular-shaped representing a growing population
2)
Age pyramid
The graphical representation of abundance of different age groups in a population is called the age pyramid. The base of the pyramid represents the pre-reproductive group, the middle represents the reproductive group and the top of the pyramid represents the post-reproductive group.
Bell-shaped age pyramid
When the number of pre-reproductive individuals and the reproductive individuals are almost the same and the post-reproductive individuals are less, the age pyramid is bell-shaped. This represents a stable population.
Final answer
The age pyramid is bell-shaped representing stable population
3)
Age pyramid
The graphical representation of abundance of different age groups in a population is called the age pyramid. The base of the pyramid represents the pre-reproductive group, the middle represents the reproductive group and the top of the pyramid represents the post-reproductive group.
Urn-shaped age pyramid
When the number of pre-reproductive individuals are less than the reproductive individuals and the post-reproductive individuals are also sizable, the age pyramid is urn-shaped. This represents a declining population.
Final answer
The age pyramid is urn-shaped representing declining population
Age pyramid
The graphical representation of abundance of different age groups in a population is called the age pyramid. The base of the pyramid represents the pre-reproductive group, the middle represents the reproductive group and the top of the pyramid represents the post-reproductive group.Triangular age pyramid
When the number of pre-reproductive individuals are more, the number of reproductive individuals are moderate and post-reproductive individuals are less, the age pyramid is triangular. This represents a growing population.
Final answer
The age pyramid is triangular-shaped representing a growing population2)
Age pyramid
The graphical representation of abundance of different age groups in a population is called the age pyramid. The base of the pyramid represents the pre-reproductive group, the middle represents the reproductive group and the top of the pyramid represents the post-reproductive group.
Bell-shaped age pyramid
When the number of pre-reproductive individuals and the reproductive individuals are almost the same and the post-reproductive individuals are less, the age pyramid is bell-shaped. This represents a stable population.
Final answer
The age pyramid is bell-shaped representing stable population
3)
Age pyramid
Urn-shaped age pyramid
When the number of pre-reproductive individuals are less than the reproductive individuals and the post-reproductive individuals are also sizable, the age pyramid is urn-shaped. This represents a declining population.Final answer
The age pyramid is urn-shaped representing declining populationSuggest Corrections
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