Carbon Cycle - Class 9 Video Lecture

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next item that we are going to discuss
is the carbon cycle so what a carbon
cycle now on similar lines and water
siphon and nitrogen cycle this is the
cycle by which carbon recycled
repeatedly through different forms by
radius biological and physical
activities so how is carbon getting
balanced in that moved here on the earth
that is in the entire ecosystem how do
we balance that and how this pattern
getting exchanged between the various
biotech and abiotic components now even
before that let us first understand
where is carbon present so carbon also
occurs as an element in things like
graphite and diamond in the form of its
own constant just at the element carbon
at the same time it also occurs in the
combined t wearing carbon combines with
some other element to form for example
carbon dioxide the carbon combines with
oxygen to form carbon dioxide or carbon
forms carbonates or hydrogen carbonate
which helps which makes the skeleton
offer lots of living organisms so these
are some of the current forms of carbon
in which it is present in all the world
now when we talk about atmosphere carbon
is present in the form of carbon dioxide
in the atmosphere and we have seen that
carbon dioxide is not present in very
huge amount approximately 0.03 percent
of the account field is carbon dioxide
carbon is also an important constituent
of proteins carbohydrates fat VIII's
acids and vitamins because all of these
also contain nitrogen but that is what
organic nitrogen because they also
contain carbon so carbon is an important
constituent of quality now let's look at
the carbon cycle setting constant cycle
we will basically talk about two two
things the processes which add carbon
dioxide to the atmosphere and the
processes which take away carbon dioxide
from the atmosphere so these two types
of processes together balance the same
amount of carbon dioxide in the
atmosphere so let us first talk about
the processes by which carbon is added
to the atmosphere how is carbon added to
that movement so what are those
processes which reduce carbon dioxide to
the atmosphere so one process that you
can think of is respiration so what
happens during the process of
respiration we take in car we take in
oxygen which you see what is respiration
it is the process in which food energy
is released from the food
so basically food is oxidized to release
energy
so during respiration food which is in
the form of glucose is oxidized that
means oxygen is taken in during
breathing and the result is carbon
dioxide plus water plus a lot of energy
so this is how we get energy from home
but as a result of this process
carbon dioxide is released into the
atmosphere so respiration is one such
process by which carbon dioxide gets
added to the atmosphere now what are the
process by which carbon dioxide is taken
from the atmosphere so one such process
is photosynthesis by plants and that is
a very crucial process because firms are
the only living organisms which can
prepare their own food by photosynthesis
and every other organism they directly
or indirectly depend on plants so that
means photosynthesis is the basic
process of food preparation for our
living organisms now what happens in
photosynthesis the plants take in carbon
dioxide and water and they combine
together to form food in the form of
glucose and as a result of this process
oxygen is reduced and a lot of energies
also produced so therefore in this case
what is happening carbon dioxide is
taken up from the atmosphere so
basically respiration and photosynthesis
these are two divorce processes in
destination carbon dioxide is given to
that one state in photosynthesis
Saturday opening is taken up from the
atmosphere now there are few other
processes also for example combustion is
one such process will be burn objects so
objects when burned they need oxygen
because oxygen is needed for body and as
a result of this process carbon dioxide
is again reduced to that person so
combustion is another process in which
carbon dioxide is released or carbon
dioxide is added to the atmosphere now
let us look at this picture of carbon
cycle because now we will be able to
understand this picture better here you
see this is the carbon dioxide present
in the atmosphere this carbon dioxide is
utilized by the plants during
photosynthesis now some part of this
carbon dioxide also combines with water
to form carbonate with water to form
limestone okay now the carbon dioxide
which is utilized by the plants let's
find that this plant will also undergo
respiration so as a result of
respiration what will happen carbon
dioxide we did used back in the
atmosphere so that lands undergo
respiration carbon dioxide is released
back to that voltage what about animals
animals also utilize carbon dioxide how
do the plants utilize carbon dioxide for
photosynthesis and animal feed on those
plants either directly or indirectly but
these animals again the under for
respiration and there that is how did
add carbon dioxide to the atmosphere
respiration and also another process
that is decomposition so when these
animals die so they are decomposed
divided by composers like fungi and
bacteria so as a result of decomposition
also carbon dioxide is released and that
is how it is given back to their
wholesale
besides this carbon dioxide is also
taken out also exist in the form of
holes
it is also there involve petroleum or
the shell
the inorganic carbonate so these are
also some other variety of forms in
which carbon dioxide issues so basically
we see that there are these four
processes like photosynthesis one major
process which takes in carbon dioxide
from the atmosphere
respiration combustion and decomposition
are the three processes which give back
carbon dioxide to the atmosphere thank
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