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  4. Representation of age pyramids for the human population is given below. Identify A, B and C by selecting the correct option. <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/b-c0fywxg5aiuj.png /> A B C A Declining Stable Expanding B Stable Expanding Declining C Expanding Stable Declining D Stable Declining Expanding

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Q. Representation of age pyramids for the human population is given below. Identify A, B and C by selecting the correct option.
Question
A B C
A Declining Stable Expanding
B Stable Expanding Declining
C Expanding Stable Declining
D Stable Declining Expanding

NTA AbhyasNTA Abhyas 2020Organisms and Populations

Solution:

Age pyramid having higher population of pre-reproductive individuals, moderate number of reproductive individuals and low post-reproductive individual count forms the proper upright triangular shape. It represents growing population or expanding one.
If the count of reproductive population is higher than the pre-reproductive population, the age pyramid forms an urn shape. It represents declining or diminishing population with low natality.
For a bell-shaped age pyramid, the population of pre-reproductive and reproductive groups is almost equal. Post reproductive population is low. Such age pyramid shows stable or stationary population, neither growing nor diminishing.