Diffusion in plants, types - Transport in Plants, Biology, Class 11 Video Lecture

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let us see how diffusion or where wind
diffusion occurred in plants so when you
talk about the plant a plant and like
all other living organisms is made up of
several cells which are there inside
this plant so each of these plant cells
look somewhat like this now when you
talk about the plasma membrane this
yellow colored boundary which you see
around the plant that is the plasma
membrane we have spoke about plasma
membrane and its properties in one of
our previous lessons so this plasma
membrane is a selectively selectively
permeable membrane that means it
selectively
allows some particles to pass through it
and it does not allow certain particles
to pass through it so diffusion or the
movement of particle of occurs across
this plasma membrane by the process of
diffusion so now inside this plant you
will have several such cells now the way
I am drawing it it is not actually like
that the cells are extremely minut that
you know you can see them wholly through
a powerful microscope so when you have
cells like this how will the transport
of materials happen it will happen from
one cell to another right so this
movement will happen by passing through
the plasma membrane so there the process
of diffusion will come into picture so
that is why that is where diffusion is
significant when we talk about
transporting plants
so now let us talk about the different
types of diffusion now broadly there are
two types of diffusion the first is
simple diffusion now as the main sees no
complication or target is simple
diffusion so here what will happen
particles will directly move across the
membrane so from region of high
concentration towards the region of low
concentration particles will move across
the concentration
by themselves they do not need the
support of anything else so let us take
an example of of a region which has a
slope like this now this slope the top
of the slope denotes the region of high
concentration and the bottom of the
slope denotes the region of low
concentration now simple diffusion is
that type of diffusion where the
particles directly move across the
concentration gradient this particle
independently moved from region of high
to region of low concentration it did
not need anyone's help or any other
practical support so it happens on by
itself across a concentration gradient
so that is simple diffusion the gates
type of diffusion is facilitated
diffusion what is facilitated diffusion
facilitated the word facilitated is
related to the term facilitator or to
facilitate that is you need somebody
else to facilitate the movement that
like how you would have heard of the
term facilitators in your examination
Center or something so there is a person
who actually helps you to do things who
use their to assist you so those kind of
those kind of persons are known as
facilitator so here the movement of the
particles across the concentration
gradient will not happen by itself so
transport proteins help particles to
move across the membrane so he had the
transport proteins they are special type
of proteins which carry these particles
from region of high concentration
towards region of low concentration that
is why these transport proteins are
known as facilitators and this type of
diffusion is called facilitated
diffusion now let us look at the same
example there we saw in case of simple
diffusion we saw that if you have a
stone it will directly move down the
hill from region of high concentration
towards region of low concentration now
it is suppose that the same stone if you
consider the same stone has to come down
the hill that is it has to come down
from
situation to low concentration but now
you have a small barrier in between so
there is a small barrier in between so
when this storm tries to come down it
gets blocked so the store is not able to
cross this hill
on its own or it is not able to move
down the hill honors or because of that
small barrier in between so that means
how but but still it has to move down
the hill because it is moving from high
to low concentration but it needs
somebody's help now let's suppose if you
put the same stone inside a big jar and
then if the jar is able to roll down the
hill even though there is a small uphill
in between but that is too small when
compared to the size of the jar so the
giant is able to roll even beyond that
and the jar is able to carry the stone
from high to low concentration so what
is this jar this jar is nothing but the
facilitator so this is the function
which is performed by the transport
proteins so in facilitated diffusion the
particles cannot move on its own from
region of high to low concentration so
they need somebody they need somebody to
carry them so they have got carrier
proteins or transport proteins so now
the question is how transport proteins
can even write so now knowing about the
facilitated diffusion there might be few
questions in your mind that how
transport proteins facilitate diffusion
how the transport proteins are able to
carry substances now why is it that only
some substances need to transport
proteins why not all substances are able
to move across a membrane by simple
diffusion or dispose patient in some
substances that they are not able to
cross the membrane even from a region of
high concentration towards a region of
low concentration so let us answer these
questions to understand facilitated
diffusion if thank you please visit
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