Viviparous & Oviparous Animals - Reproduction in Animals, Science, Class 8 Video Lecture

hello friends this video on the
production in animals part 16 is brought
to you by exam for calm no more fear
from exam so now we have understood the
entire process of reproduction in case
of human beings so human beings are
those type of animals which directly
give birth to their young ones like a
mother gives birth to this one human
baby right she does not lay eggs but
there are animals which do not give
birth to their young ones directly
instead they lay eggs so depending upon
how new organisms are born they are
acting types of animals PV panels and
oviparous
so let us see what are they so what are
we we Paris animals these are those
animals which give birth to their young
ones directly so they do not mean even
though the egg cells are formed inside
but when they give birth they directly
give birth to young ones so the
fertilization of the egg and the
development of the 40 lines to end into
an embryo and when the embryo into fetus
all those development take place inside
the mother's body so when she gives
birth she gives birth to a young
organism so that is Phoebe Paris it's
examples of VP Paris animals are humans
cows dogs cats they are all examples of
Vivi Paris animals whereas oviparous
animals are those which lay eggs which
later develop into young ones that means
the development part doesn't take place
inside the mother's body it takes place
outside
so in oviparous what happens is eggs are
formed and they had released outside and
then from those eggs you new organisms
or younger organisms are formed so this
formation takes place outside the
mother's body examples of such animals
are fishes and Phoebe ins like frogs
reptiles hence these are all examples of
repents you will have often heard that
ahem blame eggs so these are the
oviparous animals so let us see when are
the eggs
released by Kofi palace animals because
baby palace and once we have fairly
understood as we have discussed in
detail about human beings but in case of
OB Bears animal since they are going to
lay eggs so at what time will they
release their eggs so in case of
oviparous animals what happens is when
fertilization takes place so here also
the same thing will happen
fertilization would mean the fusion
between the male gamete and the female
gamete so let us suppose fertilization
has taken place as a result of
organizations I got will be formed which
will be a single cell now there will be
multiple protective layers which will be
formed over a period of time day because
I got will keep on developing at the
same time there will be some additional
layers which will be formed outside the
zygarde for protection as a result a
hard shell will be formed because of
those protective layers which are being
formed once the hard shell is formed
then the eggs are laid so the eggs which
are actually laid by oviparous animals
they look somewhat like this so outside
you can see a very hard shell so these
shell is nothing but they are the
protective layers which are present
which are protecting the developing Zhai
got inside now once the eggs are laid by
the animal for example we take the
example of hen and it is a easy for you
to visualize that hence egg because many
of you would have seen it it is also
available in the shops because it is
consumed by human beings so the even
after the eggs is laid they are given
sufficient warmed by the animal so the
bird will actually sit over her eggs so
that it can provide sufficient warmth so
that the chick can come out it can break
the shell and inhale
out because the development is happening
inside so the hardshell which we see
outside is just a protective layer but
inside the development of the zygote is
continuously taking place now once a
small chick is formed it will just break
the outer shell and it will come out and
that is how a new the new organisms are
formed or the young ones then later
develop so in this case what happened
eggs were formed inside the body of the
hen but then the eggs were laid outside
now in the outer environment or in the
external environment the development of
the eggs into the chick state took place
so it happened outside so these kind of
animals are called oviparous animals so
the entire development takes place
inside the egg when it develops fully it
bursts the shell and comes out so this
is how the concept of oviparous animals
are so now a question is all the young
wants of different organisms do they
look exactly similar to their parents
like I was telling you right for example
in human beings the human babies look
like human beings but is it necessary
that for all animals the young ones will
look similar to their parents not really
I will give you some examples of animals
where the young ones look very different
for example frog so some animals young
ones look very different from the adult
and we if you look at their life cycle
you will see that it passes through so
many different stages where the animal
looks completely different it doesn't
even look that ok it is going to be a
frog so now we will talk about the life
cycle of a frog and also a silkworm a
cell warm is a warm but in its adult
stages you see it as a month and both of
them look so different but it is the
same organism just that during different
phases of their life they look
completely different from each other so
these are two such examples of animals
where throughout their lifecycle there
very different in one phrase from
another so let us look at the life cycle
of a frog so you see these are the eggs
which are being led by an adult frog
these eggs will gradually develop to
contact Bulls so just look at this
tadpole does it look like a frog not at
all it looks so different but it is it
is actually a tiny frog the initial
stages of a frog
so this tadpole will gradually develop
its legs and it will look a little
bigger a little grown-up tadpole finally
it will turn into a frog so see just
look at the drastic change which
happened here
so the tadpole donor to a frog small
frog and this small probability to
become an adult frog in this draw will
lay eggs and from this eggs again a
tadpole will be formed so if you compare
a tadpole with a frog both of them look
so different but actually tadpole is a
young frog in a way so they look quite
different similarly if you look at the
lifecycle of a silk bomb in silkworm
also their eggs are laid on the leaves
of the trees so these are the eggs from
this a silkworm develops it looks like a
normal warm which crawls on the ground
this then later forms a structure called
a cocoon and inside this cocoon the
silkworm develops into a month you see
the silkworm keeps on developing in a
different way and finally it turns out
to be a month so now just look at the
silk one and look at this moths
so basically this is the adult form and
this is the young form and both of them
are completely different it is a warm
and it looks like a fly so but they are
the same organism so it is something
like a small human baby looks like this
and when he grows and as an adult he
looks like this so completely
contradicting but still they are the
same organism but in case of animals and
human beings or tax dogs so throughout
the lifecycle they look the same way so
these were two examples where we see
drastic changes throughout the lifecycle
and this kind of
development is going metamorphoses so
make up more forces is a term which
stands us there are drastic changes in
the life cycle of an animal where the
animal looks very different at different
stages of its life but it is that
doesn't mean that organisms of all
animals look different from others look
at human beings look at elephants Cheops
so here you can see that they're young
ones look similar to their adults it is
just that the case of human beings also
the height increases the weight
increases and as you grow old you're a
hair turns white so those changes will
be there but overall their parents will
remain the cylinder thank you please
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