however in this video we are going to
briefly look at photosynthesis we all
know photo means light and the where
synthesis means put together chemistry
the word synthesis is known as the
production of a new substance by
combining two or more substances the
photosynthesis can be defined as the
process of converting solar energy into
chemical energy otherwise it is called
as conversion of carbon dioxide and
water molecules into organic substances
with the help of solar radiation and with the help of
photosynthetic pigments
these are certain key points to be noted
in photosynthetic process chloroplast
is called as photosynthetic units
you know the plants are called as Auto
trophs which means they can synthesize
they own food material in higher plants
the photosynthesis is carried out by
chlorophyll pigments particularly
chlorophyll a and b there are two
photosystems namely photosystem one and
for photosystem two and the entire process
of photosynthesis involve so many steps
but two different types of reactions
based on the dependence of light one is
called a light reaction the second one
is called
dark reaction the light reaction is
called as light dependent reaction this
reaction takes place in the grana
portion
there are some particular steps in the
light reaction a few of them are light
harvesting by the photosystems that is
photosystem 1 and 2 and photolysis of
water molecule by
sunlight and very importantly the photo
phosphorylation which is otherwise
called as electron transport chain there
are two kinds of electron transport
chain one is long cyclic electron
transport chain and the second one is
cyclic electron transport chain the
major function of the light reaction is
the production of assimilitary
powers NADPHW and ATP the dark
reaction is called as light independent
reaction which takes place in the stroma
region of chloroplast the important role
of dark reaction is carbon assimilation
otherwise called conversion of carbon
dioxide into sugar molecules there are
some important pathways to is studied in
dark reaction for a c3 cycle or the
Calvin  cycle the c-4
cycle which is also called as
hatch and slack cycling on the CAM
 pathway that is
crassulacean acid metabolic pathway part
of this significance of photosynthesis
we all know the plants are the
photosynthetic organisms account as auto
trophs which provide food for all other
living organisms by means of
photosynthesis the process
photosynthesis maintains a atmospheric
 
of carbon dioxide the energy produced by
the photosynthesis also used to buy the
cellular organisms for other processes
it also provides resource of energy for
example
 
