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Engineering, HSC and
IIT-JEE Mains and advanced videos. Hello
students we are Studying chapter origin
and evolution and that we have certain
topic theory of capital evolution now
this theory of chemical evolution was
given by operon in 1923 ed which had
certain parameters let's study and find
out about this parameters today.
Theory of chemical evolution clearly
stated that the origin or the formation
of life on earth depended on chemical
molecules now it says that origin on
earth and it's primitive atmosphere took
place eventually
second was the formation of ammonia
methane water droplets third there was
the synthesis of simple organic
substances and finally the synthesis of
complex organic substances took place
this were the four pathways that
chemicals he relayed to foundation of
life
theory of cavity evolution not theory of
chemical use evolution is precisely
based on four parameters and those are
that origin of Earth and it's primitive
atmosphere was the first thing that
happens secondly there was a formation
of nh3 or you say ammonia water enemy
ten particles third the synthesis of
simple organic substances in the
atmosphere as well as in organisms and
lastly formation of complex organic
substance of greater molecules now
evidences goes to suggest that earth
originated back about 4.6 million years
ago when it just broke down from Sun and
had cooled and the atmosphere on earth
form now compounds like ammonia methane
with the salt into the brain and this
accumulated in this scene
now what was observed is that after your
formation of meeting ammonia was over
there were synthesis of simple organic
compounds and this organic compounds but
alcohol idea hides your glycerol and
that be present in water and once they
were present in water what happens is
that they combine and recombine and this
process was undergoing through reactions
like condensation polymerization finally
to form that required compound now a
simple organic substances together in
increasing number formed a mass or you
simply said a mixture or a colloid now
they collided and reacted aggregated to
form new complex molecules which were
polysaccharides or you simply said large
chain of molecules which could be
carbohydrates glucose my toes your fat
molecules both saturated unsaturated
fatty acid your proteins polypeptide
molecules as well as you nucleotides the
T in your molecule finally there was
formation of nucleic acid or nucleotide
or DNA molecule so students according to
chemical Theory the formation of life on
earth basically dependent on aggregation
or accumulation of molecules how various
molecules aggregated or accumulated
and finally after going through series
of reactions and permutation mixing
polymerization finally certain molecules
were formed which ultimately gave rise
to life on earth so I hope students we
are very clear with this concept
thank you
