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Q. Given figures represent comparative age-sex pyramids for India for the years $1971$ (figure $A$) and $1991$ (figure $B$), over the $20$-year period.
Study carefully the pyramids and select the correct statement regarding these.Biology Question Image

Organisms and Populations

Solution:

Both the pyramids $(A)$ and $(B)$ represent triangular age pyramids i.e., expanding populations. Pyramid for year $1991$ has large percent of pre-reproductive and reproductive population. Hence, it would go a long way before it resembles a stable population.