Sexual Reproduction: Juvenile Reproduction Video Lecture - NEET

hello friends this video under
production in organisms part 8 is
brought to you by exam feel calm no more
fear from exam so this was all about a
sexual reproduction now we will talk
about sexual reproduction now it came
from the very basics what is sexual
reproduction as I said it is that mode
of your production in which new
individuals are formed from two patterns
so having two parents is a must so as
soon as you talk about two parents you
talk about two different sexes that is
male and female so here sex is important
that is fusion between the male and the
female gametes isn't what you need male
sex cells you need female sexes that is
the specialized cells which can actually
fuse with the earth counterpart cell and
give rise to a new organism so this is
there in sexual reproduction so here the
new individuals are not identical to the
parents however they have similarities
like this guy has black hair which he
has got from his father so this guy has
brown hair which she got from his mother
but it is not that the individuals or
the children will be exactly identical
to the parents when he there do you see
that some of the other differences will
be there so here variation Socrates
differences are variations so it is a
relatively slower mode of reproduction
when compared to the asexual mode
because in a sexual mode and a lot of
organisms get reduced by processes like
binary fission I mean a lot of like
multiple fission or the fragmentation so
you would actually end up getting a lot
of them but in case of sexual
reproduction it is not like that it is
comparatively a very slow process for
example if you take the example of human
beings it is actually a very slow
process specially for human beings you
see a child takes almost nine months to
take birth so that is for one child and
again getting subsequent
is not it it cannot be a very fast
process right our question is when we
already have is actual mode of
reproduction why do we need sexual
reproduction so what are the advantages
that we have in sexual reproduction
which was missing in asexual now as I
have mentioned before also that if a
sexual the production the daughters are
exactly identical to the preparing
therefore there was no variation but
variations are extremely useful for the
survival of species right because
variations are nothing but changes
changes to adapt with the changing
environment so these changes are for
better so it actually helps the
organisms to cope up with the
unfavorable conditions so that means
variations are something which is
desirable
so sexual reproduction incorporate
variation in species which in turn helps
or survival of species each individual
in a species has its own uniqueness and
identity in case of asexual reproduction
it was just the same organisms getting
produced morphologically identical
genetically identical so there was no
uniqueness at all so if you talk about
hydra or the hydra that will get
produced by budding they will be exactly
similar so there is no uniqueness there
is no identity but in case of sexual
reproduction each organism will have its
own uniqueness its own identity the like
if suppose if there is a couple who has
three kids each of their kids will have
their own identity by looking at them
you can identify okay he is named as
exes name is why his name and say so
that means every organism will have
their own uniqueness and identity
enables organisms to survive from death
unfavourable conditions as I mentioned
before also like the in case of sexual
reproduction the any copying mechanism
is the key concept behind it as I
mentioned before so during be any copy
it is not actually so but not that bad
as well so the process of the any
copying it is not the exact copy because
if it is
exact copy then that kid will be exactly
similar to the product but that is not
the case so there are some differences
some day so those little bit of
differences give rise to variations now
if the DNA popping is very much in
actually in that is the new cell would
die as DNA won't be able to move without
cellular apparatus
correct so here all the situations are
taken care at a very initial stage when
the process of being popping starts so
from there only the organisms tend to
face or tend to prepare itself to face
the unfavorable conditions and that is
why you actually see variations now the
question is which organisms undergo
sexual mode of reproduction because for
a sexual mode we saw a lot of bacteria
fungi even plants which undergo a sexual
reproduction so which kind of organisms
undergo sexual mode of reproduction as I
said a sexual mode is seen in organisms
with relatively simpler body
organization but sexual mode is seen in
most higher organisms with complex body
structure like higher plants and animals
so in plants we see both the sexual as
well as asexual mode and plants have are
open to both types of both ways of
reproduction so you actually see both of
them whereas in case of animals they
mostly prefer the sexual mode in fact
sexual mode of reproduction is the only
mode of reproduction for animals so when
I say animals I mean all the animals in
some of the fungi also busy sexual mode
of reproduction so now the next question
is what vent and and organism sexually
reproduce now can any organism
example if you talk about any animal the
moment that animal is born is it capable
of reproducing sensually or not so that
is the question that when what is the
right time when an organism is capable
to reproduce sexually now depending on
when the cap organism is capable of
reproducing sexually there are three
phases in the life of every organism and
what are those three phases juvenile
phase which is the first phase that is
the period of growth so this is the
phase when the organism after being born
it grows now when I say organism I do
not only mean animal it can be glands
also because sexual reproduction is
present in plants also so this is the
phase where the organism cannot
reproduce sexually it is if the organism
is just growing whether it is plant or
animal it is just growing so it is the
growth phase it is also known as the
vegetative phase introns just a
different name next is that a productive
phase so as the name says this is the
phase where the Cape where the organism
is capable of reproduction so it comes
after the juvenile phase now once the
juvenile freezes over that means once
the organism has grown an organism has
become matured enough then it enters
into the reproductive phase so here in
this phase it is capable of introducing
sexually and the reproductive phase
again is followed by another phase which
is called the senescent phase what
happens in this phase aging starts so it
is the end of reproductive phase so once
it enters into this phase aging occurs
that is it intends to become older and
it is the last phase of the lifespan so
the entire life cycle of any organism
any plant or animal first is birth so
that organism will be formed then next
is growth so it will grow to become
mature and then is death so organisms
will die so again it will die and
it'll take but I mean it it will die but
it gives birth to some other organisms
so these are the three stages in the
life cycle of any organism birth growth
and death so based on this these are the
three phases from birth to grow through
the juvenile phase after growth is the
reproductive phase after reproductive
phase is the senescent phase and then
it's and phase finally leads to death so
these are the three different phases of
the of egg organism now when we talk
about the juvenile phase the jubilation
of the juvenile phase is different for
different organisms or somehow organism
it is very short that is they become
mature very quickly for some organisms
it is quite long in plants this phase
has different structures like different
shapes of leaves different colors of
feathers of birds different protections
of the body that is if you talk about
animals specifically for human beings
you would have seen that this phase
continues for up to an age of say 13 to
15 years like till you're considered a
kid so that is their juvenile phase when
you are growing your height increases
your weight increases so on growth
activities take place till you are 13 to
15 years old in the reproductive phase
what happens is that in productive
organs develop and that is how it is
defined that okay you are better odd so
B is drawn when now again this
reproductive phase again will be further
divided into I mean or based on the
introductive phase or different animals
they will be further divided into
several categories
so what let's do one thing let us
discuss each of these phase in little
more detail thank you please visit
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