What happens if birth rate and death rate are not stable?

1. What happens when the birth rate exceeds the death rate?
2. What happens if the birth rate and death rate are equal?
3. Why does the death rate and birth rates decline simultaneously?
4. Why do we need a stable population?
5. What happens when the birth rate is lower than the death rate?
6. How does birth rate and death rate affect population?
7. Do birth rates fall when mortality rates fall?
8. What are the effects of mortality?
9. How might a decline in mortality cause a decline in fertility?
10. What are the consequences of stable population theory to the population?
11. How does a population remain stable?
12. What does it mean to have a stable population?
13. How will lower birth rates affect the population?
14. Why is birth rate lower than death rate in some countries?
15. How does death rate affect population?

What happens when the birth rate exceeds the death rate?

Natural increase in a population occurs where Birth rate is greater than death rate. ... Natural decrease occurs when death rate is greater than birth rate. This means that more deaths occur in a population than babies are born so population numbers decline.

What happens if the birth rate and death rate are equal?

Effects. In the long term, zero population growth can be achieved when the birth rate of a population equals the death rate, i.e. fertility is at replacement level and birth and death rates are stable, a condition also called demographic equilibrium.

Why does the death rate and birth rates decline simultaneously?

Why does the death rate and birth rate decline simultaneously? It is because society takes longer time to adjust to change and alter its reproductive behaviour to suit the new situation of relative prosperity and longer life spans.

Why do we need a stable population?

If we want to live sustainably so that our descendants may have the same quality of life that we have enjoyed, we must get back into balance with our natural systems. We can significantly reduce our demands without hurting our lifestyle by improving the efficiency of using water and energy.

What happens when the birth rate is lower than the death rate?

Logic follows then that if the birth rate and death rate are equal, the population is not changing and if the birth rate is less than the death rate, the population would be shrinking (ie. more people are being “taken away” than are being added to the area).

How does birth rate and death rate affect population?

Population change is governed by the balance between birth rates and death rates. If the birth rate stays the same and the death rate decreases, then population numbers will grow. If the birth rate increases and the death rate stays the same, then population will also grow.

Do birth rates fall when mortality rates fall?

The Demographic Transition

First, birth and death rates are both high, so little growth occurs. Second, death rates fall due to improved living conditions, while birth rates remain high.

What are the effects of mortality?

The effect of mortality on population structures is to reduce the component of the population in which the mortality occurs. Historically, the most dangerous ages were infancy and old age (variously reckoned according to circumstances).

How might a decline in mortality cause a decline in fertility?

The total fertility rate, on the other hand, is positively related to mortality: the more deaths occur, the more ''replace- ment'' births are going to take place. If child mortality declines, fewer chil- dren need to be replaced, so that the total fertility rate declines as well.

What are the consequences of stable population theory to the population?

With growth rate fixed, the dependency ratio increases when mortality declines because more people survive to reach old age. These properties of stable populations carry over qualitatively to real populations, illuminating the effects of changes in mortality and fertility on population composition.

How does a population remain stable?

When the fertility rate is at the replacement level, a population will remain stable, neither growing nor shrinking. Fertility rates above the replacement level will cause the population to grow; fertility rates below the replacement level will cause the population to shrink.

What does it mean to have a stable population?

A population with an invariable age structure and a fixed rate of natural increase.

How will lower birth rates affect the population?

When the fertility rate falls below replacement level, the population grows older and shrinks, which can slow economic growth and strain government budgets. ... There are ways to overcome the challenges of low fertility, but it'll take an investment in the people who have been born already.

Why is birth rate lower than death rate in some countries?

The social structure, religious beliefs, economic prosperity and urbanisation within each country are likely to affect birth rates as well as abortion rates, Developed countries tend to have a lower fertility rate due to lifestyle choices associated with economic affluence where mortality rates are low, birth control ...

How does death rate affect population?

Population change is governed by the balance between birth rates and death rates. If the birth rate stays the same and the death rate decreases, then population numbers will grow. If the birth rate increases and the death rate stays the same, then population will also grow.