Photosynthesis Reaction Video Lecture | Biology Class 11 - NEET

hello friends this video on
photosynthesis and higher plants part 7
is brought to you by exam feel calm no
more fear from exam so now we will talk
about the reactions of a set of
reactions which take place in the
process of photosynthesis now there are
two sets of Menem broadly there are two
types of reactions which take place in
the process of photosynthesis light
reactions where ATP synthesis and NADPH
synthesis take place okay before that
let me tell you one more thing now in
photosynthesis what is our aim our aim
is to synthesize sugar so we have to
produce sugar from carbon dioxide but
that process for that process to take
place we need energy first we have to
generate that energy so energy is stored
in the form of ATP molecules right ATP
is adenosine triphosphate so there are
two set of reactions which will take
place when is light reaction the other
one is dark reaction so in the light
reaction we will produce the energy
which is required for sugar synthesis so
whatever energy are produced in the
light reaction in the form of ATP and
NADPH that will be utilized in the dark
reaction to synthesize sugar clear so
two sets of reaction light reaction dark
reaction in light reaction will provide
the energy which is required for
photosynthesis to take place and that
reaction the actual conversion of carbon
dioxide to sugar will take place
utilizing the energy which was produced
during the light reaction so first this
is the light reaction here ATP synthesis
and NADPH synthesis will take place now
ATP is a negative sign right
triphosphate which is the energy
currency of a cell and NADPH again is a
hi rich is a molecule which is rich in
energy in fact one NADPH can produce
three ATP molecules so you can
understand how much energy they store so
in light reaction we will produce this
high-energy molecules so this reaction
is called light reaction because they
are directly dependent on life this
reaction can take place only in presence
of light without life they cannot happen
that is why they are on light reaction
where do they occur they occur in the
thylakoid so why they occur in the
thyroid bulbs because they are lying
driven so there the light needs to be
absorbed all the time for this reaction
to take place
now who will absorb the light the
pigment which is present in the green
part what is that pigment chlorophyll so
cool the purpose of chlorophyll is to
absorb light so then this chlorophyll
present in the previous slide I
mentioned yes chlorophyll is present in
the thylakoids now such close fill is
present in the thylakoid satellite it
will be absorbed in the thylakoids and
that is why light reaction will take
place in caliban's the second set of
reaction that is the dark reaction now
as I said this is that these are the
reaction where the actual sugars and
pestles or the actual food preparation
of plant will take place so synthesis of
sugar that is in this reaction carbon
dioxide will be reduced to glucose but
quantity need energy and this energy
will come from this ATP and NADPH which
is produced in the light reaction and
this dark reactions will occur in the
stroma
so the light reaction will take place
here and the dark reaction will take
place here so in during the light
reaction
will be produced here so this energy
that is ATP and nadph will be
transferred to the stroma and in the
stronger they will be utilized to
convert carbon dioxide into sugar so
sugar will be synthesized in stronger so
this is the overall process of
photosynthesis this is how the overall
process of photosynthesis take place
first the light reaction in presence of
light then the tile abides then the dark
reaction in the stroma utilizing the
energy which was produced during that
light reaction now why are they called
dark reactions we will look at all those
things later so now how are we going to
divide this lesson so first we will talk
only about the light reactions what are
the various ways by which the synthesis
of ATP and synthesis of NADPH take place
so once you complete our discussion on
light reactions then we will start with
dark reactions now before even before we
start talking about light reactions and
dark reactions we should talk about the
pigments we should talk about weapons
like chlorophyll because since that time
I have been telling you that chlorophyll
is a pigment which is present in the
thylakoids of the chloroplast which help
to absorb light but we should know some
more detail about these pigments is
chlorophyll the only pigment which is
present in green plants or there are
some other pigments also which are
present in a plant so let us spend some
time talking about the pigments once we
are clear with the knowledge of pigments
then we will talk about light reactions
followed by that reactions thank you
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