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Question

A population is said to be mature or stable when


A

It forms an age pyramid of urn shape

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B

It forms an age pyramid of bell shape

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C

It forms an age pyramid of triangle shape

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D

It forms an age pyramid of irregular shape

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Solution

The correct option is B

It forms an age pyramid of bell shape


The correct option is B.

Explanation for correct option:

  1. The number of pre-reproductive and reproductive individuals is usually equal in a bell-shaped age pyramid.
  2. Post-reproductive individuals are comparatively fewer. It also represents a stable or stationary population, neither growing nor diminishing.

Explanation for incorrect options:

Option A:

  1. In an urn-shaped age pyramid, the number of reproductive individuals is generally higher than the number of pre-reproductive individuals.
  2. It also represents a declining or diminishing population with considerable negative growth.

Option C:

  1. Triangular age pyramid has a high proportion of preoperative individuals, moderate no. of reproductive individuals & fewer post-reproductive individuals.
  2. It represents a young or rapidly growing population.

Option D:

  1. Irregular shape pyramid shows an unstable population.

Final answer: A population is said to be mature or stable when it forms an age pyramid of a bell shape.


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