Question

Which of the following sentence(s) is(are) NOT true about age-structure pyramids?

• A. A rapidly expanding age pyramid is narrow at the base.
• B. In a slowly expanding age pyramid, the bar lengths for pre- reproductive age class is very slightly larger than reproductive class.
• C. In a stable age pyramid, the bar lengths in all age classes are quite similar.
• D. A declining age pyramid is broad at the base.

Answer 1

Answer: (A), (D)

The correct options are
A A rapidly expanding age pyramid is narrow at the base.
D A declining age pyramid is broad at the base.

A rapidly expanding age pyramid is broad at the base as the number of individuals in the pre-reproductive stage is more. In a slowly expanding age pyramid, the bar length of the pre-reproductive class is slightly larger than the bar length of reproductive class. In a stable age pyramid, the number of individuals in all age classes is quite similar. A declining age pyramid has more number of individuals in the post-reproductive stage, making the pyramid narrow at the base.