Decomposition Rate Video Lecture - Biology Class 12 - NEET

hello friends this video on ecosystem
part eight is brought to you by exam
feel calm know about fear from exam so
now we will talk about the next aspect
of ecosystem that is decomposition so
the first aspect was primary
productivity where we saw that how
different organisms mainly the producers
they differ form a major role in
production now is decomposition because
decomposition again is equally important
because we cannot keep piling up all the
dead bodies right so we need two
composers so let us talk about
decomposition so let us see what happens
in the composition we saw that there are
a group of organisms called the
composers and their job is to decompose
the dead and decaying matter so they
decompose or they break down dirt then
animals and plants but what exactly is
the process of decomposition
so they composition if you look at the
name it is d plus composition
composition means something which is
composed of composition would refer to
formation no deformation means breaking
down so then it was just the opposite of
formation so deformation so you are
breaking it down so it is a process in
which complex organic matter had broken
down into simpler forms so if it is a
very simple I mean that the meaning of
the term is quite simple so what is this
complex organic matter so if whether you
talk about plants or animals so they are
all organic in nature they are all
carbon containing substances now when
our climber or an animal dies so what
are we left with we are left with
organic matter and complex form because
and as you all know inside the body of
the living organisms so everything is in
quite complex form
so these decomposers what do they do
they break down the complex organic
matter into the most simplest form
possible
so that is their job and that is what
happens during
the process of decomposition so our
Amazons which help in the compositions
they are quite big composers and where
every top of decomposes the most
important organisms which comes to our
mind are bacteria and fungi
dead creatures so what is death treatise
now when we talk about decomposition
this becomes a very common term so let's
see what it is
so that treatise is the raw material for
decomposition so what do we mean by raw
material let's take an example let us
suppose when your mother cooks food for
you there are certain raw materials
which she needs to prepare food for you
now let us suppose if you say that you
do not have vegetables at your house you
do not have the spices in your house you
do not have bread or wheat or flour or
you do not have any ingredients which is
required for cooking will your mother be
able to cook food for you not really
right so she needs the raw material for
preparing food so in a very similar way
these decomposers they feed on dead and
decaying matter so that dead and
decaying matter is raw material for the
process of decomposition because they
actually act upon those decaying matter
and decompose they that is break them
down into simpler forms so those dead
and decaying matter is known by this
term point dead creatures the dead
treatise is the term for raw material
for the composition so what forms that a
cheetah's dead plants remains could be
they're traitors death animal remains
could be dead treaters because this is
what on which the decomposers feed upon
without this the process of
decomposition will not happen until and
unless you have do not have dead and
became method there is no purpose of
decomposers there is no point in for
having the process of decomposition
so these dead plant
animal remains are termed as dead
treaters fees matter
so the excreta of different organisms or
that also forms a part of decorators now
we will talk about later of
decomposition that is how fast the
decomposers decompose the death treatise
so now I am using the terms because now
you know what is decomposition what are
decomposes and what is their treatise so
let's see what is the rate of
decomposition and what determines the
rate of decomposition what determines
how fast the dead cheaters will get
decomposed on how slow the decomposition
will take place so there are several
factors which determine the rate of
decomposition some of them are soil
quality so let us see what are the
factors in the what we mean by soil
quality how soil quality affects the
rate of decomposition so one is
abundance of microorganisms into soil
now what happens is these microorganisms
they act as decomposers so more
microorganisms are present faster is the
rate of decomposition now these
organisms need air so that they can
decompose Aerobie honey so the more the
number of microorganisms are faster
becomes the decomposition process so it
is something like this it is pretty
simple let us suppose that there are 60
students in your class so let us say
that you have to do a project work so if
the time which is allotted to you is say
two hours and if only five students in
your class are participating in
completing that project work you are
definitely going to take a longer time
but in all the 60 students participate
in completing the project work maybe you
will be able to finish it in one hour
instead of two hours so when the
participation increases that is when
more number of organisms participate
then the time taken to complete that job
reduces so similarly here also if more
micro Travis
present in the soil so in that case the
rate of decomposition increases
decomposition happens faster next is the
moisture content of the soil moisture
and content and temperature of the soil
so these are again two important factors
which affect the soil quality now
temperature and moisture content
moisture content would mean the amount
of water which is present in the soil so
that also plays a very important role
now what happens is when the temperature
is relatively higher so when it is warm
temperatures warm temperature favors the
process of decomposition so we can say
that warm temperature warm depilation is
basically higher temperature so this
flavors the process of the composition
whereas low temperature inhibits the
process of decomposition so you would
have seen that even in our houses if we
want to keep up if you want to store
some food material what do we do we
store it at a very low temperature and
we put it inside the refrigerator so
what happens low temperature inhibits
the growth of microorganisms and that is
how the food means good so in a very
similar way here also if the temperature
is too low inside the soil in that case
the microorganisms will not be able to
perform their job that way so the rate
of decomposition will decrease so a
relatively higher temperature favors the
process of decomposition and therefore
the rate of decomposition increases next
is high aeration aeration is the
availability of air now as I said that
microorganisms would need air so that
they can decompose aerobic I however
impress absence of air some of them can
undergo anaerobic respiration but still
aerobic respiration is something which
is favored so high
something which favors the process of
decomposition and therefore high
aeration increases the rate of
decomposition pH so pH of the soil
business decides the acidic or basic
nature of them so I so that chemical
composition of the soil also plays an
important role in the process of
decomposition because what does the
process of decomposition
when complex substances are breaking
down into simpler forms basically a lot
of chemical reactions are taking place
so you can imagine if the pH values or
if the pH is not suitable in that case
the rate of decomposition might get
affected in a very similar way if let's
suppose if you have water soluble
substances present there so this would
take less than times time taken would be
less because they are easily soluble in
water whereas if you have substantial
slightly lean or kaity images which are
quite hard so they are going to take
more time for to decompose so it also
depends upon the type of material which
you have for the composition to take
this so these are some of the factors
which affect the rate of decomposition
so composition of the organic matter
this is what I was telling you just now
that we're different is something like
lignin or writing which is hard and it
is going to take more than if it is
water soluble substance it is going to
take less time so what I hope organic
matter you have to bring down is also
important to determine the rate of the
composition climate as I mentioned
before as well so climate is an
important role because climate can
actually affect the organisms now
climate in terms of temperature or
moisture or presence or absence of
oxygen so now we are talking about
temperature or moisture of the
atmosphere so even in that mostly if the
temperature is very high so that or if
it is extremely low both of them is
where you have an adverse effect on the
process of the composition so so a
temperature on the slightly higher side
will favour the process of decomposition
and therefore increase the rate of the
composition whereas an extremely low
temperature would inhibit and therefore
decrease the rate of decomposition so
temperature and moisture content of that
mostly act the soil quality as well as
them as well as the performance of the
decomposers in the process of the
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