Out of every 100 people in the world:
(REF: NCERT Textbook)
Density Of Population: The number of people living in a unit area is called density of population. It is usually expressed as number of persons per square km. The average population density of the world is 51 persons per square km. South Central Asia have the highest population density; followed by East and South East Asia. The population density in India is 382 persons per square km.
Topography: A larger number of people live in the plains than in the mountains or plateaus. Plains are suitable for farming, manufacturing and most of the other activities. The Ganges plains are the most densely populated area of the world.
Climate: People prefer to live in moderate climates and avoid extreme climates. Hence, less number of people lives in the Sahara Desert and in the polar regions of Russia, Canada.
Soil: Fertile plains of the Ganges and Brahmaputra (India), Hwang-he, Chang Jiang (China) and the Nile (Egypt) are the areas with a high population density.
Water: Water is essential for survival of people and hence, more people live in the river valleys than in the deserts.
Minerals: Areas with mineral deposits attract people because of potential of economic development.
Social, Cultural and Economic Factors
Social: Areas with better housing, education and health facilities are more densely populated. Pune, Bangalore and Delhi are the cities which attract people because of better facilities.
Cultural: Places with religion or cultural significance always attract people. Due to this, Varanasi, Jerusalem and Vatican City are densely populated.
Economic: Industrial areas give lot of opportunities to people. Mumbai's population grew because of this reason. In recent years, areas around Delhi have attracted a large number of migrants from across the country; because of industrial development.
Until the 1800s, the world's population grew at a slow and steady pace. The birth rate and death rate were very high during this period. There were no proper health facilities. Agricultural production was low and hence food availability was a problem.
The world's population reached one billion in 1804. Within 150 years after that, the world's population reached 3 billion in 1959. This is usually referred to as the population explosion.
40 years after that, the world's population doubled and became 6 billon in 1999. This could happen because of better food supplies, health facilities. Death rate reduced and birth rate remained fairly high during this period.
Birth Rate: The number of live births per 1,000 people is called birth rate.
Death Rate: The number of deaths per 1,000 people is called death rate.
When the death rate is more than the birth rate, it will lead to de-growth in population. When the birth rate is equal to death rate, there will be no growth in population. When the birth rate is higher than death rate, it will lead to growth in population. The difference between birth rate and death rate is called natural growth rate of population.
Life expectancy: The number of years that an average person is expected to live is called life expectancy.
Migration: When people move from one place to another in search of livelihood; it is called migration.
Emigration: When people move outside their country, it is called emigration.
Immigration: When people come from another country, it is called immigration.
The population of the USA and Australia has increased because of immigration. On the other hand, the population of Sudan has decreased because of emigration. People from less developed countries usually migrate to the developed countries in search of better employment opportunities.
In case of internal migration, people from rural areas usually migrate to urban areas. Internal migration does not change the size of the population, but changes the composition of population in a particular area.
Some countries are showing high population growth, e.g. Kenya. Some countries, on the other hand, are showing de-growth in population, e.g. UK and many European countries.
The population composition of a country tells about age profile, sex, literacy level, health condition, occupation and income level. Thus, the structure of the population is called population composition.
Population Pyramid: A population pyramid is a graphical representation of population composition. In a population pyramid, the total population is divided into various age groups, e.g. 5 to 9 years, 10 to 14 years, etc. For each age group, the percentage of the total population is subdivided into males and females.
The relative number of children (below 15 years) and that of the elderly (above 65 years) shows the relative number of dependents in the population. The relative number of people in the working age (between 15 and 65 years) shows the relative number of productive people.
Population Pyramid of Kenya: The population pyramid of Kenya is very wide at the bottom and very narrow at the top. This means that while the birth rate is very high; so is the death rate. A larger proportion of people below 15 years of age show that the relative number of dependents is very high in Kenya.
Population Pyramid of India: The population pyramid of India shows a wider base but the middle portion of the pyramid is in healthy shape. The top is narrow. This shows that there is sizeable proportion of people in economically productive age group. This is a good sign for the economy of India as the number of dependents is not too much.
Population Pyramid of Japan: The population pyramid of Japan shows a wider middle and narrower base and top. This indicates towards a low birth rate and death rate. The relative size of dependent population is less compared to the relative size of population in the economically productive age group. While this is ideal for the present, it does not hold good omen for the future. In future, there would be more elderly and less people in the working age group.
REF: Graphs are taken from NCERT textbook
Human Resources will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.