Sexual Reproduction in Plants - Reproduction in Plants, Science, Class 7 Video Lecture

hello friends this video under
production in plants part 11 is brought
to you by exam fear calm no more fear
from exam so now is the time to discuss
about sexual reproduction in plants
because it is not only a sexual mode by
which plants can reproduce they can also
reproduce sexually so we will see in
this section how plants can reproduce
sexually where two parents could be
involved now why do we need to talk
about sexual reproduction because in a
sexual reproduction we saw that the new
plants which were formed they were
exactly identical to the pattern so
that's how it was so there was no new
traits which ever seen in the new plant
but when we talk about sexual the
production you would see that since
there are two plants which are involved
in this case so the new plants which are
promptly are not really exactly
genetically identical to their parents
so we will see how exactly this entire
process take place now when we talk
about sexual reproduction there is a
certain part of the plant which acts as
the main reproductive structure and the
reproductive organ of a plant is a
flower so flower is the main
reproductive organ so if if there is no
flowers in the plant then what would
happen who would carry out the process
of reproduction yes now there are many
plants which do not have flowers so
either they have some alternative organs
which can undergo this process of
reproduction otherwise the plant will
not be able to reproduce so in this case
we will see and what first of all we
have to understand the structure of the
flower so only then we will be able to
understand this entire process of sexual
reproduction because in sexual
reproduction we need a male and a female
so we need a male sex end and a female
sex cell and then these two cells will
fuse together to form a new plant so who
will produce this male sex cell at the
females exit so before going into all
those details let us talk about the
structure of the flower now a flower in
any plant
is said to be unisexual if either male
or female reproductive part is present
in it now the male and female
reproductive parts they are not
identical they are different and that is
why the male reproductive part will
produce the male sex cell female
reproductive part will produce the
female sex cell and these two cells will
then fuse together to form the new plant
so there are certain flowers which
either contain the male reproductive
part or the female reproductive part so
if it contains the male reproductive
part it is a male flower if it contains
the female reproductive part it is a
female flower but if you know me it will
contain both the reproductive parts so
such flowers are unisexual uni means one
the term uni means one and sexually is
next sex so these kind of flowers
contain only one sex either male or
female so examples of such plants are
papaya watermelon so in these kind of
tons you will see either they contain
the main part or the female part so here
you look at this example of watermelon
so you can see this is the male part
this is the female part sometimes Mike
can take the male part some plants might
contain the female part but one time
will contain either male or female so
you see the male and the female part
look so different so a flower which is
the male flower and the flower which is
a female flower they look quite
different from each other
you take example of human beings in
human beings also the male's the men
they contain the veil reproductive part
the females or the women they contain
the female reproductive part and these
two reproductive parts are very
different from each other both is
structure as well as in function so the
same is true for plants as well whereas
there could be some types of flowers
which are bisexual bindings too so these
flowers will have two sexes that is both
male and female reproductive parts are
present in it so that means the me
and the female both are present here so
that means that the process of sexual
reproduction can happen within the same
flower because the plant that flower
itself has the male part and the female
parts of the male sexes and the female
sex cells both can be produced within
the same flower examples of such flowers
are China rose mustard so these are all
examples of sexual reproduction these
are examples of bisexual flowers so
please remember this because these are
important so these are the basics from
where we start talking about sexual
reproduction first you should know from
where the male and the female sex cells
are being produced another important
thing I have been talking about sex
cells since quite some time see these
sex cells are also on gametes and these
are specialized cells which help in the
process of reproduction so our body
contains so many cells in fact all
multicellular organisms they contain
multiple cells but out of these cells
there are some specialized sex cells
which are called Cabot's and these
Granite's help in the process of sexual
reproduction so during sexual
reproduction the male gamete and the
female gamete will fuse together to form
the new organism and the male gamete
will be produced by the male male
organism and the female gamete will be
produced by the female organism so in
this case the bisexual flower center use
both male and female gametes the
unisexual flower can produce either male
or female gamete so if we compare the
asexual and sexual reproduction in
plants because in sexual reproduction we
have already discussed so if you try to
compare these two types of reproduction
in plants you would see that asexual
reproduction was easier and faster not
much competition is important because
you know it's like some parts of the
plants they just give rise to new Glantz
seedless plants can also be grown
because seeds really do not play a role
in asexual reproduction you do not need
if I'd know what is seen now seed is
actually a structure which is formed
from the flower we will see how exactly
see it is formed so it is just a part of
the flower which later becomes seed so
in case of a sexually production flower
do not play a role
now since flowers do not play a role so
seeds also do not have major role so
even glands which do not have seeds they
can also be grown desired traits can be
preserved through generations like as I
was telling you by artificial vegetative
propagation like cutting grafting or
layering so with all these methods some
of the trails or some of the
characteristics which are desired by us
they can be preserved so you can climb
more trees with those kind of treats and
that's how they can be preserved over
generations new plants form a
genetically identical to parents this is
one thing but since it is just one plant
which gives rise to a plant
so obviously the new plants are going to
be exactly identical to the previous
plant more groans in diseases now here
we don't have much to handle as far as
diseases as are concerned now what
happens is when so in this plants there
we they are being produced either from
their rooms or steps or from their needs
there is not much inbuilt protection
against diseases so that is why they are
more prone to diseases there are no
genetic variations because here as I
said they are exact identical now since
they are exact identical so obviously
there are no variations no new features
are seen in the new plants whereas when
you talk about sexual reproduction
it is obviously a slower mode because in
a sexually traduction a lot of plants
are found so the process is quite faster
but sexual reproduction is quite slow
and mode of reproduction but here new
traits are saying it seems so genetic
variation are seen that means new traits
or new characters are seen so characters
which were not present in either of the
parents or
using some of the new plants it is less
prone to diseases because the mechanism
by which the process of sexually
production happens that adds some
inbuilt protection against diseases so
that's how they have less prone to
diseases so these are some of the
positives and negatives of both sexual
and asexual reproduction thank you
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