Observe the given figure representing different age pyramids for human population and answer the following question.
If the reproduction rate is equal in all the given pyramids, the chances of mortality after 50 years will be highest in:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → D
With equal reproduction, the pyramid with the most young people, the broad-based D (expanding), will have the most people reaching old age 50 years later, so mortality then will be highest in D.
Option (1) E — Incorrect. E is stable, with fewer young than D.
Option (2) F — Incorrect. F is declining, with the fewest young.
Option (3) Both E and F — Incorrect. Neither E nor F has as many young as D.
Option (4) D — Correct. D is the expanding pyramid, with a very broad base of young individuals. After 50 years these many young will be old, so the number of deaths, that is mortality, will be highest there.