L10 : Photosynthesis - Getting to Know Plants, Science, Class 6 Video Lecture

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here comes the most important job of the
leaves that is leaves prepare food and
without food plants can survive and this
process is called photosynthesis so
green plants prepare their own food by
photosynthesis as I said photo means
light so this food is prepared in
presence of light and what happens
during the process of photosynthesis so
during photosynthesis we see that food
is prepared in the form of glucose so
glucose is the main product of
photosynthesis so let's see what exactly
happens in this process of
photosynthesis now there are certain
things that are needed for
photosynthesis to take it so the raw
materials which are needed for
photosynthesis the first requirement is
chlorophyll
because if chlorophyll is not there
photosynthesis will not happen so
chlorophyll is the green colored pigment
which is present in the leaves of the
plant and this green pigment what do
they do they utilize the energy of the
Sun that is why we see that if the
process takes place in presence of
sunlight so they utilize the solar
energy or the sunlight energy which is
stored in the sunlight the next
requirement is sunlight if sunlight is
not there so what will chlorophyll do do
not be able to do anything third
requirement is water so what it is again
a substance which is needed for
photosynthesis to happen and this is the
reason we keep watering the plant every
day so if you stop watering a plant for
say three food is what happens the
plants start drying up and eventually
the plant would die so plants receive
water through the soil the fourth
requirement is carbon dioxide and how do
the clients get carbon dioxide carbon
dioxide is present in the atmosphere so
the plants would get the carbon dioxide
through the stomata on their leaves that
is the tiny pores on their views so
that's how they will get carbon dioxide
okay so once all these raw materials are
there then what happens then the process
of photosynthesis happen so let's see
what exactly happens during this process
now we have all of these so overall what
happens is the carbon dioxide will
combine in with the water and this
process will happen in presence of
sunlight and the presence of chlorophyll
is also must because chlorophyll helps
helps to absorb the energy stored in
sunlight and that energy enables this
reaction to take place so carbon dioxide
will combine with water to form c6h12o6
and this is nothing but glucose and
along with this oxygen will be released
and a lot of energy will also be
released so this oxygen will be thrown
out again through the stomata so
basically using stomata
takes in carbon dioxide so plants take
in carbon dioxide and plants give out
carbon dioxide as a result of
photosynthesis now this glucose which is
formed is the food that is stored in the
plant now it is not stored in the form
of glucose it is stored in a more
different form that is many glucose
molecules they combine together to form
something called starch and the food is
stored in the leaves of the plants in
the form of starch so does that mean
that starch is always present in jeans
yes
indirectly that's what I told I told
that leaves perform photosynthesis they
produce glucose when in glucose combined
together to form something like starch
and starch is present in the leaves as
boom so basically the food of the plant
is present in the form of starch now if
you say that how do I know that starch
is present in leaves so let's perform
the iodine test you remember in one of
our previous lessons we learnt that
there are techniques by which we can
decide whether a particular substance
contains carbohydrates or not and starch
is an example
so the test to detect the presence of
starches iodine test so how do we
perform iodine taste we take a leaf we
take an iodine solution that is how do
we prepare iodine solution we pour few
drops of iodine into water and then we
get the iodine solution now when we put
few drops of this iodine solution on the
knee what should happen if starch is
present now if there is a bluish black
color on adding the ideal solution this
blue-black color indicates the presence
of starch that is what we had learned in
iodine test right now when you actually
perform this iodine test on leaves you
see that the result is positive which
sees that starch is present in leaves so
we have experimented it proved that food
is prepared by the plants in the leaves
and the food is stored in the leaves in
the form of stuff thank you please visit
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