The age groups in a population are classified by

Reproduction rate

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Death rate

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Age of marriage

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Sex ratio

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Solution

The correct option is A Reproduction rate
A age group is defined as a number of people classed together as being of similar age. It is usually shown as toddlers, teenagers, adults with range of 18 - 35, 35 - 50, 50 - 60 and senior citizens. Therefore they are classified by reproduction rate and not by death rate, age of marriage or sex ratio. Hence, option A is correct.

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Similar questions

For the population control, the marriageable age should be made ___.

	Column I	Column II
1.	Birth rate	Ratio of number of individuals added (by births) in a population in a given amount of time to the initial population
2.	Death rate	Ratio of number of individuals died in a population in a given amount of time to the initial population
3.	Sex ratio	Ratio of reproductive to post-reproductive individuals in a population
4.	Age pyramid	Pyramid obtained when the percent individuals of a given age or age group is plotted for the population

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