Question

When birth rate is equal to the death rate, it is called as
A) Acceleration stage
B) Early growth stage
C) Plateau stage
D)Exponential growth stage

Answer 1

Hint: Demography is a theory which used to refer to the shifting of birth rate and death rate ratio over many years. It even includes the representation of education, minimal technology, and economic development.

Complete answer:
To answer this question, we have to know details about the population time graph. The graphical representation is used to demonstrate the number of humans living every year. This graph includes the death rate and birth rate of humans every year and a graph is being prepared to calculate the total population. In the graph the horizontal axis represents the time and the vertical axis represents the total size of the population of an area, or a country, or the entire world. To represent this logarithmic scale is used for the y-coordinates on the vertical axis. That means the distance is equal along the scale shows equal ratios of increase.
Now, when the death rate is equal to the birth rate the population growth is zero that means there is no increase and decrease of population in that particular year. In other words we can say that the fertility is at replacement level and the death rate and birth rate is stable, such condition is termed as demographic equilibrium. Therefore, in the graphical representation of population time graph when the population growth is zero it forms a plateau stage.

Hence option ‘D’ is the correct answer.

Note: When the birth rate is higher than the death rate it shows the exponential phase, when the death rate is higher than the birth rate it shows the transitional phase. Before the exponential phase there is an early growth phase which represents the population about to grow.