When Discussing Human Population Trends,birth Rate Is Often Expressed as a Number

question 53

Multiple Choice

When discussing human population trends,birth rate is often expressed as a number called the total fertility rate (TFR) .The TFR is the number of children an average woman in the country has in her lifetime.The number of children a couple must have to replace themselves in the population is called the total replacement rate (TRR) .TRR can be used a lot like death rate when calculating population trends.As a worldwide average,each couple must have 2.1 children to replace themselves (the extra 0.1 is the result of infant mortality) .
TFR and TRR are given below for several countries.Which country has a decreasing population size?

• A) TFR = 2.1,TRR = 2.1
• B) TFR = 5,TRR = 4
• C) TFR = 3,TRR = 3
• D) TFR = 7,TRR = 9
• E) TFR = 2.2,TRR = 2.1

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