In this chapter we have studied about
various types of interactions how
organisms interact with each other
now we are going to study about various
terms the first term which we are going
to study is population when I talk about
population it means number of organisms
offer species living in a particular
area at a particular time if I decline
this definition for you all on household
level for example in your house if there
are four members the population of your
house or the definition of population
for your house will go on number of
organisms which would be four okay of a
particular species now human beings are
there now so the population of your
house is four and the species which live
in your house would be human beings they
are living the particular in the day
dress of your house obviously and at a
particular time for the number of years
you have been living in your house so
the definition of population goes on the
organisms which are living that
particular area at that particular time
of Bin's particular species it could be
for example in normal residential life
it could be a human population in jungle
it could be an animal population in
garden it could be a plant population so
according to the species the definition
of population goes on change now
population is an amalgamation of our
addition of two different terms first
term is natality and second thumb is
mortality nettle it is nothing but birth
increasing both it and mortality is
nothing but death rate then we talk
about mortality natality birth rate it
is the rate in which new individuals of
form in a population at a particular
time in a particular area natality means
as in a particular area for example in
India the natality rates are very very
high as as we are progressing it has
been observed that every second or every
two and a half seconds under
individualís one so natality rate goes
on increasing okay the natality rate of
a particular area for example in Mumbai
would be different then Hyderabad or any
other strip Natalya depends on that
particular area next we talk about
if mortality rate is nothing but death
it is defined that death rate in a
population at a particular area in a
particular time now depth read it has
been observed that death rate is slowly
slowly declining whereas birth rate is
increasing the reasons would be one
availability of medicines lot of
medicines available second the new
scientific inventions which had led to
decrease in mortality rate and increase
in natality rate so these are the things
if we see the gky for geography wise
it's been observed that India is a
second largest population we are just
behind China comes to number-one
position and here just behind reasons
for this is our net allocated or the
birthday the quite high it is why ten
states like u P be higher and so on so
on and so forth whereas our death rate
or mortality rate are very very low to
do various inventions various medicines
all the techniques which are available
so let us see the definition of
population
okay so the definition of population
goes on number of organism of species
living in a particular area at a
particular time population is a mixture
or amalgamation of natality plus
mortality mortality is death rate of
mortality is called as death it is
defined as death rate of number of
people which have died in a population
per unit time per unit area
next comes natality natality means
nothing but birthrate or increase in the
number of individuals it is defined as
birthrate or increase in population that
is per unit time or per unit area thank
you
