Note on Human Population

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Human population


As human population is the total amount of human being livind in this earth. We have been knowning about the different advantage and disadvantage of human population growth .Any sudden increase in the human number describes the growth of the human population.Day by day the grpwth in the developing countries have been creating the globle problems as well.the growth of human population is serious conceren of these days the enormous increase in work population is baffling population growth means "the total population added to the previous population at particular time and place the physiology capacity to produce off spring is called potential or reproductive potential."


Population Growth curve


on the asis of environment resistance or nature of growth of population , it hass 2 types such as J- shaped curve and S shaped curve.


j shaped Curve


it is called exponential growth curve, when any species introduce into new habits with plenty of food and without competition.Automatically population increases very rapidy .the population growth in such a way that within short period of time cover large area if the graph plots takes in I in shpe in figure.

source :maa.org
source :maa.org

S-shaped curve


it is population growth rapidily.In the mean time compentation areises ,such as inter or intra special or due to series factor of environment resistance check the population growth rate .
initially growth is very slow called lag phase, with the rapod growth follows log phase and due to environmental resistance growth follows log phase and due to environmental resistance population declines untial population s reach, such stage is called" stationary phase" if graph ploted we see as S shaped as well.

source:www.pleacher.com
source:www.pleacher.com

Problems of population growth


Due to growth of the population may problems may arise in a individual life. If population increases flowing problems may arise -
1. Global worming.
2. No proper health services for all.
3 . Economic development decreases.
4. Required amout of food would not be found.
5. Nutrition food would be unbuildable.
6 . no poroper place.
7 no proper education.
8 no proper or Quality life to be optioned.
9 problems of thieves may arise.


Control


it is eevident that present that rate of population growth the earty would soon beaome severly overcrouded and inbabituated various ways of contolling population growth are
1 natural method
I withdrwal or coitus interrupted method.
ii Rhythm method: – sex at time of safe period of mentural cycle .
2 hormal method: -
preganancy can be prevented by suppressing the peoduction of ovum by hormens which are take in the form of ovalk contraceptives .
3 mechanical or barriers method:-
I use of condom by meale .
2 cervix cap diaphgram this cap check the entance of sperm in the uterus .
3 use of ICD or inta uterine contraceptive device ].
4 spermicidal cream ,available as kamal chaki of foaminh tablet kept in vagia which check entrance of sperm .
4 surgical method:-
1 vassectomy.
2 tubectomy in female.
3 Hysterectomy.
5 Corrective abortion method.

Reference:

Agrawal, sarita. principle of biology. 2nd edition . kathmandu: Asmita book Publication, 2068 ,2069

Mehta, Krishna Ram. Principle of biology. 2nd edition. kathmandu: Asmita, 2068,2069.

Jorden, S.L. principle of biology. 2nd edition . Kathmandu: Asmita book Publication, 2068.2069.

  1. on the asis of environment resistance or nature of growth of population , it hass 2 types such as J- shaped curve and S shaped curve
  2. it is population growth rapidily in the mean time compentation areises such as inter or intra special or due to series factor of environment resistance check the population growth rate 
  3. it is called exponential growth curve when any species introduce into new habits with plenty of food and without competition automatically population 
  4. it is eevident that present that rate of population growth the earty would soon beaome severly overcrouded and inbabituated various ways of contolling population growth
.

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