Population is not static, but rather dynamic and ever-changing. It deals with how and why the number of people and structure of a population changes over time. The world's population has tripled since 1950 and is continuously rising, with 59.5% now living in Asia. The size of a population is affected by factors like birth rate, death rate, and migration. The birth rate refers to the number of live births per 1000 people in an area per year, and if it is above 2 then the population will rise. The death rate refers to the number of deaths per 1000 people in an area per year. Immigration is movement into an area, while emigration is movement out of an area.

1. Population Dynamics
Class : 8
Chapter: 2
Session:1
Made by: Keneith Pereira1

2. What is Population
• It is about where they live, how many people there are and why they
live there.
• It signifies the total number of people inhabiting a specific area at a
particular time
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3. is population fixed ?
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No, it’s not static rather dynamic:
Ever-changing

4. Population Dynamics
• It deals with the study of how and why population change in
size and structure over time
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5. Distribution of Pop. in
• The world pop is continuously rising and has tripled since 1950
• Mid of 2018: 59.5 % of global population was living in Asia
Few Questions:
• What were the reasons for this much growth rate of population?
• Will the growth rate remain the same ?
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6. Factors affecting the size of
population
The answers to all such questions are based upon:
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7. Factors that affect the size of the population in the
Fertility Rate or Birth Rate
Death rate or mortality rate
Immigration and emigration
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8. eg: 16 students out of 220 answered = 7.27% response rate
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Calculation of data/ Statistics

9. Fertility Rate or birth rate
• Generally birth rate refers to the number of live births per 1000
person in given geographical area per year.
• Some statistics(maths) applied:
If the fertility rate is larger than 2 than the population shall rise as
there are more children than their parents. (vice versa)
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10. Mortality or Death rate
o birth rate of new people increases the population, death rate decreases it.
Death rate refers to number of deaths per 1000 people in an given
geographical area per year.
 Things/factors that affect death rate:
1. Avalibility of healtcare facilities 2. Lifestyle habits
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11. Immigration and Emigration
Migration refers to the movement of people from one place to
another because of varied reasons.
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12. Emigrant and Immigrant
Migration refers to the movement of people from one place to
another because of varied reasons.
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14. Population change
Is defined as the change in number of people during a specific time
which is because of varied factors births, deaths and migration of
people.
Natural growth rate = Birth rate – death rate
N.G.R of any country is the difference between the birth & death rate
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15. Density
Q. What is changing in the following 3
pictures?
A: space between molecules/ no of
molecules
Q. What is static in the following three
pictures?
A: the container/ the beaker also it can
be ?
AREA
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LOW
average
high

16. Density of population
• Population density is the number of people for a given area.
• Often given as how many people per square kilometer.
• If places are densely populated, they will have a high population density
• if places are sparsely populated, they will have a low population density.
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18. These countries on Map
our office
t
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19. Density of population
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Moderately Populated