Plants in Forests Video Lecture | Science Class 7

hello friends this video on forests our
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let's talk about the plant variety in
the forest now it is not just a couple
of varieties of tons which are seen in a
forest huge varieties of plants are
found in forest starting from bamboos
need Palash teak field so all these
plants are found in a fault these are
some of the examples now just look at
their appearance they look so different
from each other so when you compare say
teak wood tree so I am sure you would
have teak is very famous for making
furnitures you would have heard of a
good fern each other they are very
expensive so they are those good are
obtained from this plant so if you look
at this plant and compare it with this
fig tree what do you see you not afraid
you see it it's so huge the crown of the
plant the upper portion of the plant is
like spread out but in this case it is
not that spread out again if you compare
it with the bamboo it again looks
different so it doesn't have this kind
of a crown as you can see in the other
plants so every plant has got a
different shape but all of these are
mostly big trees
you also have smaller trees like ferns
mosses so mosses are generally found
over the self is like stones or rocks
and they get coupled with this green
carpet a layer of mosses ferns are also
not very big they are not flowering
plants they do not give flowers but you
know they have beautiful leaves and yeah
they are not very tall again matt'll oak
time so look at the structure of fine G
it is again very much different from the
other trees so it has a conical shape so
it's very you know it's FX as like a
very sharp tip and bottom is having a
specific shape so when you look at the
shapes of these different trees you see
that all of them have different
structure some of them are very much
spread out some of them are small in
size some are conical in shape and all
so it is not necessary that in every
forest all types of clans will be
available now that again depends on the
climatic conditions of that particular
forest because depending upon the
geographical location of a forest the
types of trees which will found there
are decided for example in there are
different types of forests like there
are rain forest there are deciduous
forests there are temperate forests you
will be studying about them in your
geography so you will get to know that
which types of plants are found in which
type of forests so so that's again a
different story but when you in general
talk about forests you get to see a huge
variety of plants in further starting
from tiny plants to huge tall trees now
when we talk about the plants in the
forest one very important thing that
needs to be discussed are the horizontal
layers in the forest now as I said there
are so many trees and the variety of
trees are also more and the number of
trees are also whole so because of that
what happens is this above portion of
the plant which is termed as the crown
what is the meaning of crown crown is
generally the the owner of a king so
when do you think a king or a queen
whose her or his crown so on the top of
their head right so that that's the
place of the crown so similarly is
plants the word crown is used to refer
to the above ground branchy part of the
plant so if you look at each of these
plants so this is the crown of this
plant so this thing which you see here
which is above the ground and which
gives the top shape of the plant so
that's the crown for this time this is
the crown again for this time you see
the crown is of a different shape so
it's like tapered towards the bottom and
then it spreads out towards the top for
this plant again you see it's like
uniformly spread out from bottom to top
each of these plants are the screen have
different shapes of crowns and in the
forest as I said you have different
varieties of plants they are of
different sizes different shapes so they
all have different shapes of their
crowns now why are we talking about
crowns because these crowns when a lot
of plants are present together so all
these crowns form a layer of the forest
and that is known as canopy so canopy is
the structure formed by collection of
individual plant crowns of a plant
community now if you ever look at the
forest from outside like as I was
telling that if you are traveling on the
highway and you are crossing by a forest
this is how the forest would look like
from outside so you feel can you see the
land the land is not visible why because
it is completely covered with the dense
Crown's of the trees so only the crowns
are visible from here right now when you
look at it from inside the forest so
let's say you are present inside the
forest and you are looking above you are
looking towards the sky so this is the
kind of view which you will get so you
see you are highly able to see the sky
why because a roof has been created by
the Crown's of the tall trees so all
these crowns they have actually formed
and layer and that layer is like a roof
of the forest and this roof of the
forest is termed as the forest canopy so
this is important because you know
because of this canopy because of this
layer you there forest does not receive
very intense sunlight so the sunlight
reaches through these gaps in between
the canopies as you can see here
similarly during the rainfall also when
there is heavy rainfall the rain water
doesn't directly fall to the ground so
if it falls on the leaves and then from
there it drop
droops over the branches and that's how
it reaches the ground so we will look at
the advantages of the formation of
canopy but this is how it is so that's
why when you look when you see from
outside this
that layer which you see the topmost
layer or the roof of the forest that is
formed by the plant crowns and it is
called canopy now canopy is about the
topmost layer or the roof but below that
also we have under stories under means
something which is located below like we
talked about multi-story buildings what
do we mean by that that means many
layers of the building when you have
multiple floors in a building so that is
multi storey similarly in the forest
understory means those plants which are
present below the canopy the smaller
plants they form the under stories in
forest so these are plants layers
growing beneath the forest canopy so
canopy was formed by the Crown's of big
trees which is the roof of the forest so
that is like the topmost layer so below
that will be the medium-sized plants
mostly the shops and even below that
would be the herbs that is grasses or
other small plants so all these small
plants they are they form the understory
of the forests now these forest
understory is receive less intense light
when compared to the forest canopy now
that's very obvious because the canopy
is like the Crown's of the tallest trees
so obviously they are receiving the
sunlight directly there is nothing in
between to block the sunlight but when
it comes to the forest understory they
are located to within so they are like
covered by the forest canopy so let us
say
this is the Sun okay and this is the
canopy of a forest do not think it is
cloud because I'm just roughly drawing
the canopy so let's say this is the
forest canopy which is nothing but this
is like formed by Crown's of multiple
trees so these are the different trees
and they are forming this canopy okay so
this canopy is receiving the sunlight
directly so obviously it is if the
canopy is receiving intense light but
when you talk of talk of the forest
understory that means the plants which
are here they are small small plants now
how will the sunlight to reach them so a
lot of sunlight gets blocked by the
canopy so less amount of sunlight will
be able to reach these smaller plants so
that's why the understory is receive
less intense light then the forest
canopy
however these understories are adapted
in a way that they will be able to carry
out their life processes with that much
amount of sunlight only so for example
so even with this even with lesser
intense sunlight received these
understories are capable of carrying out
photosynthesis photosynthesis is the
process by which plants prepare their
own food and for photosynthesis sunlight
is needed without sunlight they cannot
carry out photosynthesis
so these understories are adapted to
carry out photosynthesis even in intense
light and also the shrubs and the herds
they are they generally remain small or
they grow up to a medium size and they
are capable of completing their entire
lifecycle in the shade of the forest
canopy so that's how they are adapted so
basically when you talk about the layers
in the forest so when you look at a
forest from like from outside so that
entire structure for forest so you see
that a forest consists of three
horizontal layers mainly three
horizontal
lairs and what are those three layers so
the first layer is formed by the tall
trees and the Crown's of these tall
trees form the canopy of the forest the
second layer is formed by the shrubs
which are the medium-sized plants and
the third layer is formed by the herbs
which are small sized plants and they
receive minimum sunlight now you know in
certain forests the forest canopy is so
dense that hardly any sun rays reach
deep inside the forest so some forests
are that dense as well thank you please
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