Introduction - photosynthesis in higher plants Video Lecture - NEET

hello friends this video on
photosynthesis in higher plants part 1
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more fear from exam topics to be covered
in this lesson our introduction early
experiments where use photosynthesis
take place how many pigments are
involved in photosynthesis what is light
reaction the electron transport
where are the ATP and NADPH used the c-4
pathway photorespiration and the factors
affecting photosynthesis so how do we
introduce this lesson on photosynthesis
the term photosynthesis a knock is not a
new one for you as you have been
studying about this process since may be
when you are in class 7th or 8th right
so photos and essence in simple terms is
the food preparation process of green
plants we all know that green plants are
auto drop status they can prepare their
own food when it comes to food
preparation you can think of ourselves
for to to find out the similarity
between us and the plants for example we
eat so many different stuffs for example
we eat vegetables we eat some of us are
even longer jayleen so we eat fish and
meat but do we eat it's just like that
we need to prepare that right so for
that what do we do there is a process of
cooking where we prepare the food we
cook the food we mix it with all spices
and
and then we eat it so in a very similar
way plants also prepare their own food
in order to prepare their food they need
some raw materials the similar way you
need you say the vegetables and spices
in place so I can prepare a dish
similarly plants also need all the raw
materials all the current environmental
conditions to prepare their food now the
question is what does the food of the
plant
the food is prepared in the form of
sugar in the form of a simple sugar
glucose and then the food is stored in a
plant in the form of starch so now you
all know what is a glucose it is a
monosaccharide what is the starch it is
a polysaccharide so see these things
help as go ahead with your lessons you
get to know more and more knowledge on
each and every mind you thing so here is
this lesson we are going to talk about
this process of photosynthesis in much
more detail that how exactly the process
takes place what are the various
chemical reactions which are involved in
the course of this process so that is
the agenda of this lesson to discuss
photosynthesis in detail now before we
get into the detail let's start from the
scratch however I know that all of you
are aware of what is photosynthesis but
still for a quick recap let me start
from the beginning so what is
photosynthesis it is the process by
which green plants prepare their food in
the form of glucose in presence of
sunlight so as I said the food is
preparing the plants in the form of
glucose which is a simple sugar now in
order to prepare this plants need raw
materials now what are those raw
materials we will see that a little
later they need carbon dioxide they need
water
this has to happen in presence of
sunlight why because sunlight
what does sunlight have sunlight as the
light energy so sunshine basically
provides the energy required for the
process to take place for example when
you are cooking cooking also requires
energy sometimes you would have seen
that when you don't feel well for
example your mom is not well so she
feels be she doesn't feel like cooking
food correct so if there is no one to
cook food
it is not prepared so the process of
cooking doesn't take place so your honor
that the process takes place your mom
should have some energy correct so in a
very similar way for the process of
photosynthesis to take place plants also
give some energy and who provides that
energy that energy comes from sunlight
so presence of sunlight is again a
band-aid for this process to take place
and also note that everywhere it
mentions that this process happens in
green plants wide range lands we will
see that a little later that why
specifically in the green world is
mentioned we'll see that also now this
is a natural process you can see so I
mean we do not see the thumbs that okay
it's time to prepare food now so start
preparing your food it doesn't happen
like that it is a natural process it
happens on its own in nature so
photosynthesis is the physical chemical
process so when I say physical chemical
it means that it is a physical process
as well as a chemical process where I
said physio because it is a
physiological process it is the natural
process which takes place inside a plant
and which is needed for the survival and
sustenance of the plant but at the same
time it is a chemical process because a
lot of chemical changes take place
during this process when I am thinking
Changez I need a lot of chemical
reactions keep up any because this
process of preparing food for example
glucose is formed so glucose is the
product of the reaction which take place
inside the plant so there are two
reactants there are few enzymes which
are involved which catalyzes the various
reactions taking place inside the plant
now as we go ahead with the lesson you
will get to know that there are so many
chemical reactions there are so many
chemicals which are involved in this
process and that is why photosynthesis
is a physical chemical process we will
now talk about the discovery of
photosynthesis how photosynthesis was
first discovered by our scientists now
there were a couple of experiments which
were performed in the early days - it
was hot act photosynthesis the word came
quite later the word itself what does it
mean photons light so photo means light
and synthesis means preparation to
prepare something or to produce
something so food preparation in
presence of light is quite
photosynthesis now this term came quite
later
so nobody started experimenting
purposely to know about photosynthesis
because that I people did not know what
photosynthesis but why am i forming
experiments on on some other things on
plants gradually scientists got to know
more and more information about a
process which is taking place inside all
the green plants and then they studied
it in even more detail and got to know
that okay there is a process by which
every plant prepares their own food so
they gave the name photosynthesis to
that process so that is how it all came
out now we here talk about some of the
experiments which were performed during
those early days and each of those
experiments give us
a bit of information and all those bit
of information joined together led to
the discovery of this process of
photosynthesis Joseph Priestley was one
of the eminent scientists who performed
quite a series of experiments and his
experiments started giving us some basic
idea about this process
what exactly did not actually describe
the process of photosynthesis but it
started to give us some information at
least so quadratus experiments let us
see now what was this purpose I mean
when he started experiment he had some
game in his mind right for example if we
do something we do it with a with a name
for example you are studying biology
some of you might have this purpose that
ok I want to know about living organisms
so out of that curiosity you are
studying it some of you might have an
ambition of becoming a doctor and to
become a doctor you need to have a very
good knowledge on biology so that is why
you are studying this so now different
people might have different purpose of
doing a particular thing
similarly Joseph Priestley also had a
purpose to perform this series of
experiment and what was his purpose he
wanted to understand the factors
responsible for plant growth now he
always thought it ok starting from a
small seed it grows into a sibling the
sitting gradually matures to become a
young plant the plant again matures and
gradually it develops into a big tree so
what are the factors internally which
are responsible for the growth of a
plant he wanted to understand those
factors he also wanted to understand the
process of food preparation in plants
which is now known as photosynthesis
that time it was not known of course so
he thought that if the plant is growing
that means there is some
the food which is being made available
to the plan for example we human beings
are growing because we eat food so
similarly if plants are growing some
sort of food is being provided to the
plan so where's that food coming from
and what is that how is that food
getting prepared so he was interested to
know all these things and that is why
they started experimented now thank you
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