Accelerated Eutrophication: Harmful effects Video Lecture - Biology Class 12 - NEET

hello friends this video on
environmental issues part 12 is brought
to you by exam feel calm no more fear
from exam now when we talk about
eutrophication there is another concept
of accelerated eutrophication that is
forcefully intro fixation on comfort or
forceful aging of legs by introducing
more and more nutrients or more and good
chemicals into the water because we know
by introduction of more nutrients in the
form of phosphates or nitrates the
growth Hawk or the primary productivity
can be increased and with the primary
productivity increases the legs start to
age quickly so that is called
accelerated eutrophication and this
accelerated eutrophication can be a
major cause of water pollution so that
is why we talked about eutrophication
here so let's see what happens so this
is the acceleration of the process of
Aging due to human activities
accelerated means what increase to
increase the speed of something so here
to increase the speed of aging of the
lakes so that is quite accelerated
eutrophication and it happens due to
human activity so what kind of human
activities can increase the speed of
Aging of lakes so some of the human
activities which can accelerate this
process are for example disposal of
sewage without treatment so sewage
disposal could be one such human
activity if the contingent waste
disposal which there came a lot of
fertilizers and insecticides and
pesticides disposal of industrial wastes
again industrial wastes will also have a
lot of chemicals which might be rich in
nitrogen or phosphorus now all these
wastes contain lot of phosphates and
nitrates and these phosphates and
nitrates act as plant nutrients plants
need these phosphates and nitrates for
their growth and development therefore
plants tend to grow at a faster rate and
this accelerates the process of aging
because god maybe what happens
is normally portable he saw the process
of eutrophication how it happens it
changes from a legal topic state to me
so traffic stain and from diesel profit
state it gradually changes to you
traffic states so this is how the
gradual conversion happens and each of
these conversion take several years like
all you could talk a permiso traffic
might take some hundred years again
we'll do talking to you talking might
even make some thousand years or so so
after after many years this transition
actually takes place but then suddenly
there's an increase in the nutrient
content in that case what happens too
much of plant roots takes place
therefore too much of family
productivity happens now when too much
of plants start growing what happens the
lower sediment layer increases so the
lake length too becomes shallow and as a
result what happens is it directly
triumphs it the transition directly
takes place from oil and go trophic to
you dropping so there is no music topic
state in between so it directly jump
strong or you could traffic to you topic
and the amount of time taken is less
than hundred years so if you compare the
second transition with the first
transition what do you see if the
process is accelerated to a large extent
earlier it was in thousands conversion
of oligotrophic to you trophic was in
thousands of years but now it is even
less than hundred years so in this case
the state which is received it is not
even in trophic you tropic steel in fact
it is hyper you trophic state that means
when the lake is too much shallow and
when there is the primary productivity
has also increased too much so in that
case it is said to be hyper eutrophic
so now this is a scenario which arise
due to human activities and the human
activities include disposal of wastes
into the place so this is how it happens
so this was all in good traffic and from
all eco traffic it directly becomes you
drop you got even higher you trophic and
how this happens due to disposal of
several wastes which are rich in and
these wastes are rich in nutrients like
nitrates and phosphates and because of
this nutrients to many plants tend to
grow primary productivity increases and
therefore the depth of the lake it
reduces so this is how accelerated
eutrophication take place so now the
question is what is the effect of
accelerated eutrophication
how do we know that accelerated
eutrophication is something which is not
desirable why why is it harmful so in
case of accelerated eutrophication there
will be excess nutrient enrichment in
the form of nitrates and phosphates
which are present in the all the types
of wastes which are the opponent allow
late as a result of this what would
happen to much of these nutrients will
make the water clarity poor so there is
a reduction in the clarity of water
growth of algae will take place because
even algae as we saw algorithm
why does I conclude Jake please when
there is too much of nutrient present
due to the presence of excess nutrients
that I can undergo excessive growth and
that is how advant occurs so growth of
algae will take place which might even
result in algal bloom lack of dissolved
oxygen now what happens is when there is
too much of nutrients present so due to
the algal bloom or due to growth of too
many unnecessary
your plants or due to extremely high
increase in the primary productivity
what happens is the
region gets used up and therefore there
is lack of dissolved oxygen for the
aquatic animals threat to aquatic life
now as I said if either gloom is - I
will bloom in itself is a threat to
aquatic life at the same time when the
water also gets now when the composition
of water also changes due to the
presence of too much of nitrates and
phosphates so the water also is no more
good for the aquatic life so that means
it is a threat to a curative life and it
can even kill the aquatic organisms
living there so now that we we read
about quite a few important causes of
water pollution let us quickly see that
how can water pollution be controlled so
- proper sewage disposal
after sewage treatment now as we saw
primary and secondary treatment of
sewage can obviously turn it from
extremely toxic to less toxic and that
is how it will reduce the water
pollution segregation of wastes now if
we start disposing wastes directly into
water some of the wastes might contain
nitrogen some might contain phosphate
some might contain lead mercury and what
not so it is always better to segregate
the waste so that may separate the
organic wastes from the non
biodegradable waste and then they can be
disposed of accordingly shallow pond
should be preferred over bigger ones for
domestic and industrial wastes now even
after proper segregation or even after
proper treatment when we have to dispose
the wastes we need to choose the
appropriate lake for example the
shallower lakes they are what does that
mean so they have already aged they are
already over linux so if we use those
leads it is better because they do not
have much depth so if their depth is
less the aquatic life living there is
also going to be less and anyways the
ways
have been treated therefore they are not
going to be that helpful so the lost
diet might would have come if we had a
disposed it into a young lake is going
to be quite less in this case so
therefore we should always try to
utilize the older legs or the shallower
legs for disposal of the basic and
industrial wastes avoid the use of
fertilizer before rain this is extremely
important now as we have seen that
fertilizers are something which are used
in in agriculture in order to improve
the crop productivity and these
fertilizers are have extremely high
content of phosphates and nitrates so
now when we apply fertilizer to the
field and immediately after that if it
rains what happens is the fertilizer get
washed away and it pollutes the nearby
water body the nearby pond or the nearby
river therefore we should always avoid
using fertilizer before rain or we
should never irrigate the field after
applying fertilizers thank you please
visit www.payoor.com to watch more
educational videos with a better
experience please do not forget to Like
and subscribe to our YouTube channel for
latest updates thank you once again