# Human Population Importance & Types of Population - Ishwaranand

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## Human Population Importance Types of Population

• It is defined as a group of interacting and interbreeding organisms of the same species living in a particular area in unit time.
• e.g. The amount of fishes present in a fishpond forms fish population or the number of man-eaters living in a forest kinds of tiger people of that forest.
• Thus, the population is the smallest unit of the community.
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## Human Population

• It is several human beings living in the unit area, in unit time. e.g. Population of a village or district or state or nation or the world.
• The subject of the human population is Know that demography.

#### Importance of  Population (Demography)

• It helps to study the increase or decrease the size of a population.
• It helps in the planning of the national economy.
• It helps to find out the need and problems of the population.
• It helps to fulfill the present and future needs and problems of a population.

## Types of the population

#### Any population manifests certain group properties no shown by individual parts of the groups

1. Natality
2. Mortality
3. Sex ratio
4. Age distribution and
5. Density

### Natality of Population

• Natality about birth motion is the number of individuals born per unit time, per 1200 individuals of each population. Greater this natality larger order be the size of each population.
• The maximum possible rate of reproduction of a population is called potential.
• The observed rate of reproduction of the population is called realized or ecological natality.

#### Natality is calculated by the following formula,

Total no. newborns in a year a particular area (n)
Natality=-----------------------------------------------------------------------------X 1000
Equate the population about the year of the particular area (N)

If 100 babies are born in a population of 5000 n a year, then the natality, i.e. birth rate will be as follows
100
Natality =---------X 100
5000
=20 per thousand.

### Mortality of Population

• Mortality and death rate is this number of individuals that fall per unit time, per 1000 personage of the population.
• The size of the population decreases if its mortality is high. The death of the individual due to ageing is called potential mortality.
• Death due to factors like diseases, accidents, etc, is called realized mortality. Realized mortality is higher than potential mortality.

#### Mortality is calculated by the following formula,

No. Of deaths in a year in a particular area (n)
Mortality=----------------------------------------------------------------x 1000
The average population of that year in that area (N)

If the total death in a population of 5000 is 50 in a year, then the mortality of that population will be follows
50
Mortality = ----------x 1000
5000
= 10 per thousand

### Sex-ratio of Population

• The sex ratio is the number of females per 1000 males of a population. Actually, the ratio should be more or less the same, but variations occur due to various reasons.

#### The sex ratio is calculated by the following formula,

Number of females
Sex ratios =-------------------------
1000 male
• The sex ratio data of India shows that the number of females compared to males is gradually decreasing. The sex ratio for the last 40 years is given below

#### Sex ratio in India.

Year Females per 1000 males
1961941
1971930
1981934
1991937
2001933
• Kerala is the only state where the proportion of females is higher than males. Preference for a male child, poverty, and the low status of women in society are the prime reasons behind this unequal ratio.
• A high mortality rate among women of their reproductive age is also responsible for a decrease in the number of females.
• If in a population, females are more, then it is called feminine population, whereas, if males are more, it is called masculine.

### The age structure of Population

• It is the age-wise distribution of the individuals of a population into groups. Generally, the members of a population can be divided into the following three age groups,
1. Pre-productive group: 1-14 years (children).
2. Reproductive group: 15-60 years (adults).
3. Post-productive group: 60 years and above (old people).

#### In India, according to the census, the age structure is described as,

Year / Age 1-14 years15-60 years6-yrs and above
197142%54.5%3.5%
198139.72%54.07%6.21%
199136%57.59%6.41%
200130.8%64.3%4.9%
• If the population mainly consists of a pre-productive group, it is said to be an expanding population.
• If it is mainly made up of the post-productive group, then it is called a declining population.
• A population predominantly consisting of a reproductive group is a growing population.
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### Density of Population

• Density is the total number of individuals living per unit area at a specific time. Density is the calculated formula the following formula:
• D = n/a
• Where, D = density; n = a number of individuals; a = area in square kilometers.
• Density is calculated by knowing the number of people staying in a particular area and taking into consideration the area of that place.