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Engineering, HSC and
IIT-JEE Mains and Advanced videos. Students
today we are Studying chapter origin and
evolution of life and that we are
studying topic Struggle for Existence by
Darwin now going to father of evolution
Darwin the organisms which will survive
on earth depends on how much an organism
is strong
there is survival of fittest in the
biosphere so what's the survival of it
is let's study and find out today.
 Davin put in different books
of organisms this always a fight for
food shelter area of habitat and this
fight continued still the most fittest
organism in that biosphere comes around
and fights for its living now this
struggle could be intraspecific between
communities or it could be interspecific
between different companies depending
upon wherever it is present for example
this survival for fitness could be
animals living in jungle which will onto
similar jungle or between organisms that
live in two different places for example
a desert as well as a land area and the
survival for fittest start for your
basic needs like food shelter habitat
hunting in the animal category
struggle for existence by Darwin now
that was very precisely pinpointed only
quite emphasis on this are going to dub
an organism's fight or they have similar
competition among themselves for their
basic survival instant of water home or
shelter food and mate or partner now
this is called struggle for existence
which keep a check on ever increasing
number of species now due to this
phenomena what happens is that organisms
who are fit food to fight all the
organisms those who possess that
fighting spirit who do survive whereas
those organisms who couldn't fit or
survive themself almost extinct in the
ever-growing population and there is
always a check in the population to do
this now struggles are of three
different types
fiol have started their struggles could
be of three different kinds
the first one is intraspecific now
example of interspecific struggle could
be a fight between two different dogs
for for now it is a fight between
members of same species dog and dog
whenever there is fight between a cat
and the rat
they too belong to two different species
so this is called as interspecific fight
and in the specific fight could be
between a lion or a tiger for a jungle
or a follower that dog and a cat for the
food when I said the terms which are
called as environmental struggles now
environmental struggles have to be done
by each and every organism that's living
at that particular land it could be dog
cat during floods extreme cold or during
fights between two different groups of
the jungle what davin observed was that
a few organisms will fit in fine who do
the fight survive whereas others
perished and eventually time and reduce
the pool of organisms so students in
this part of the chapter we didn't study
about struggle for existence and how
organisms stayed were fit and fine
I hope you know very clear with this
concept thank you
