Zero growth of population is indicated by

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(C) Zero population growth is indicated when the age groups are balanced,resulting in a stable population size.An age pyramid is a graphic representat

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Reproductive individuals are equal to pre-reproductive individuals

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(C) Zero population growth is indicated when the age groups are balanced,resulting in a stable population size.An age pyramid is a graphic representation of different age groups in a population,with the pre-reproductive group at the base,reproductive individuals in the middle,and the post-reproductive group at the top.Age pyramids are of three types:$(i)$ Triangular Age Pyramid: The number of pre-reproductive individuals is very large. The number of reproductive individuals is moderate,and post-reproductive individuals are fewer. The population size is growing.$(ii)$ Bell-shaped Age Pyramid: The number of pre-reproductive and reproductive individuals is almost equal. Post-reproductive individuals are comparatively fewer. The population size is stable (zero growth).$(iii)$ Urn-shaped Age Pyramid: The proportion of the reproductive age group is higher than the individuals in the pre-reproductive age group. The number of post-reproductive individuals is also sizable. It represents a declining population with negative growth.

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