L7 : Parasitic ; insectivorous Plants - Nutrition in Plants, Science, Class 7 Video Lecture

hello friends this video of our
nutrition in plants part 7 is brought to
you by exam for your calm no more fear
from exam so this was all about
autotrophic nutrition in plants so we
saw that how plants prepare their own
food and in what form do they store the
food now I told you about heterotrophic
nutrition where plant there are plants
which depend on other plants or animals
for their food so now we are going to
talk about the heterotrophic nutrition
in plants so some plants depend on other
plants or animals for their food so they
are not self dependent now why they are
not self dependent may be because they
cannot perform photosynthesis so if they
can't perform photosynthesis they will
not be able to prepare their own food so
in that case they will either feed on
some other plants or give you feed on
some other animals like I gave you
example of insectivorous plants so some
plants feed on insects also so that
means these heterotopic plants will
depend on other terms or animals for
their food
they lack chlorophyll because when they
lack chlorophyll they will not be able
to there will be no photosynthesis when
there is no photosynthesis so obviously
the plants cannot prepare their own food
so they are heterotrophic
so in heterotrophic nutrition let us
first talk about the parasitic plants so
what a pattern because in heterotrophic
again you have many different types when
can the parasitic nutrition one could be
saprotrophic nutrition say again we will
discuss about each of them so we start
with parasitic plants so these are the
terms which take nutrients from another
living plant so they depend on some
other plant so basically these plants
they live inside the body of another
plant like I gave you when if while
trying to explain the term parasite I
think the best example that I can give
you is that of a warm which lives inside
the human body so a lot of warm source
tiny creatures live inside our intestine
so they obtain their food and nutrition
from our body so they basically are
parasites because they live inside our
body and obtain their nutrition from our
body so similarly there are certain
plants which live on other plants and
obtain their nutrition from that plants
so such plants are called parasites so
these plants which live on other plants
they are called parasite and the plant
on which they depend for their food this
plant is called host so host is that
plant where this parasite is living so
let me let me give you a very common
example of so let us take one very
common example of a parasitic plant and
that is daughter on cuscuta so both are
the same plant so cuscuta or daughter so
here you can see these plants these
yellow colored plants very thin leafless
vines which you see here they are these
parasitic plants now can you tell me why
are the yellow in color and not green
exactly due to lack of chlorophyll now
since they do not have chlorophyll they
cannot perform photosynthesis and
cannot prepare their food so these
plants they depend on some other plants
so here you see this cuscuta are the
yellow plants and they are actually
living on some other plants which are
green in color so this host plant so
basically this green plant is the host
so this host plant is going to perform
photosynthesis prepare its food and the
cascada is going to obtain its food from
the host plant so how is it going to
obtain its food these plants have
root-like organs that penetrate into the
stems of the host plant and that and
through the those root leg warmers they
derive water at all are the nutrients
from the hosts so these plants
especially the dawdle they do not have
chlorophyll in fact even if they have
they have any little chlorophyll which
is not enough for photosynthesis so this
is one example of a parasitic drag
another example is the Australian
Christmas tree so this is called
Australian Christmas tree because of its
appearance that is how they look like so
these plants are also called nazia so
that is also another name of the same
plant so these plants are equipped with
green leaves so if you look at these
plants they have green leaves so that
means they have chlorophyll so they can
photosynthesize and provide its own
nutrition but that means they are
capable of photosynthesis they can
prepare their own food but still they
meant a parasitic root connections with
other plants to exploit their water
supplies and obtain water from them so
these plants are like even though they
are capable of preparing their own food
they still want to steal food from other
clans so that is how they are the cells
they are stealing food from other plants
again through their root connections so
that means they are parasite so using in
the first example in this example these
plants they do not have a choice then
depending on other branch because they
can't prepare their own food but in the
second example
even though they are capable of
preparing their own food but still they
also try to obtain prune food from other
clans so both of these are examples of
parasitic plants the next plants which
we will talk about at the insectivorous
plants the name itself says that these
plants feed on insects so here the
leaves are modified into structures that
help to trap insects too so for the best
example for insectivorous plant is the
pitcher plant
so in pitcher plant if you see the leaf
is modified into a structure which looks
like a picture so you see it's like a
jar a picture with a lead so you see
this acts as the lead and this is like a
picture so that's how that's the beauty
of nature so these plants in these
plants their leaves are modified into
these structures now what happens is
these leaves act as a pre trapping
mechanism they act as insect trapping
mechanisms now what happens is whenever
an insect comes near this picture there
is a deep cavity inside now inside this
picture is present a lot of digestive
juices and all so once the insect falls
into this picture then those digestive
fluids actually have been digesting that
insects like whenever we eat something
the digestion happens inside our body
because of the various digestive enzymes
which are present inside our body
similarly inside this picture a lot of
digestive fluids are present so as soon
as the insect fall inside the pitcher
the insect gets digested by these fluids
as well as the insect comes near this
pitcher the rim of the pitcher is
extremely slippery so this part is very
slippery and that is why as soon as then
succeeds air the insect slips inside so
the insects fall into the trap and as
soon as the insects all inside the lid
closes and that's how the insect gets
digested inside so there are also some
air like structures which are present
here on the rim and these are like
structures actually help to bring the
insects inside so the liquid inside the
pitcher drones the insect and gradually
dissolves the insect inside and in
circuits digested so that is how these
insectivorous plants work so here also
you see they depend on other insects but
at the same time these plants they also
have chlorophyll and they can also
photosynthesize but this is an
alternative mode of nutrition so they
are like they are autotrophic but at the
same time they are heterotrophic also
because they depend on other organisms
like other insects
so this is about insectivorous plant
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