Questions - Reproduction in Organisms Video Lecture - NEET

hello friends this video under
production in organisms part 16 is
brought to you by exam feel calm no more
fear from exam so with this we have
reached towards the end of this lesson
so now it is time to look at some of the
questions just to check whether you got
it right or not so let's look at
question number one which is better mode
of reproduction sexual or asexual and
why so now if you look at both the words
of reproduction good sexual and asexual
you will see that both has its own
benefits as well as disadvantages
however if you have to choose one of
them I think sensual mode of
reproduction is a better code of
reproduction because it introduces
variations now as I say that in the
asexual reproduction the new organisms
which are produced that until they are
exact copies of a parent so there is no
variation at all and why do we want
variations because variations are always
for better it helps organisms to survive
in adverse conditions it also helped in
the evolution of new species with small
small variations over a period of time
you get the new species altogether new
but I have gone together
so variation resides an audition of
species so because of some of these
reasons sexual reproduction is a better
mode
question number two why is the offspring
formed by asexual reproduction
therefore - as Flo very simple clone is
something which is exact copy of
something else now in asexual
reproduction the organisms which are
produced are genetically as well as
morphologically identical to the parents
and that is why they're quite close so
in a sexual reproduction only one parent
is important so there is one thing now
since one parent is important it becomes
very easy to copy the DNA and reduce an
exact replica so the offspring produce a
tenant
morphologically identical to the beds
and that is why they are quite close let
us look at question number three how
does the progeny form from a sexual
reproduction differ from those formed by
a sexual reproduction now as we already
discussed in case of asexual
reproduction since only one parent is
involved therefore the new individuals
which are formed are exact copies of the
parent so the offsprings are genetically
and morphologically identical to the
parent so that is one thing no
variations are seen so here we do not
get to see any sort of variations
because they are exactly identical
whereas on the other hand in case of
sexual reproduction the offsprings are
not exactly identical however they might
have some similarities with the any of
their parents because there are two
parents are involved variations are seen
and that is something because of which
of sexual reproduction is a preferred
mode question number four higher
organisms have resorted to sexual
reproduction in spite of its complexity
by now sexual reproduction introduced
variations and variations is something
which makes the organism better to suit
it to the unfavorable environmental
conditions it is something that is
better so variations allow organisms to
cope up with the unfavorable conditions
so this is one of the important reasons
because of which the higher organisms
prefer sexual mode of reproduction and
also variations result in evolution of
better organisms which can shrink to an
environment better level we already
discussed about the example of dogs for
example if the dogs want to survive an
extremely cold conditions if they have
fur that is something better and these
kind of traits come with little bit of
variations question number five explain
why meiosis and gamma to Genesis
interlink so what is gametogenesis
gametogenesis is the formation of
gametes so the formation of sexes so
that is gamma 2 G gnosis and what is
meiosis meiosis is nothing but the
reduction and division that is the type
of cell division where the chromosome
number is reduced to 1/2 so gamma 2
Genesis is the formation of gametes and
the gametes are haploid so how are these
gametes formed these gametes are formed
from the gamete mother cells which are
Mia sites and they are deployed so in
order to form haploid cells from diploid
cells so these are deployed that is the
view size then you want to form haploid
cells so that means you want to reduce
the chromosome number and for that you
need new your sis so that is how they
are interlinked so formation of haploid
cells from diploid cells needed actual
division and meiosis is reduction or
division when the chromosome number is
reduced to half so that is the link
between meiosis and gap into Genesis
question number 6 identify each part in
a flowering plant and write whether it
is haploid or diploid so here we are
given some of the parts over me so ovary
is deployed as I said all the cells of
the body they are all generally deployed
except for the sex cells and the anthem
is again deployed egg so egg is the
female gamete so this is haploid pollen
oil and again is now is like the male
gamete so it is again haploid male
gamete
haploid is I got this as deployed
because of male and female gamete fuse
together to form the diploid zygote let
us look at question number seven
differentiate between azuz for and as I
got now the names look quite similar by
they are two different and
so when you talk about Zeus poor you are
talking about a sexual reproduction
because these are a type of spores which
help in a sexual reproduction whereas
when you talk about zygarde it is the
result of sexual reproduction that is
when fertilization take place between
male gamete and female gametes I gardens
corner so Zeus pore is more time because
it has flagella so it can move from one
case to another whereas the zygote is
non motile it is just the egg so the egg
is non motile right so it is just the
fertilized egg so it is known what I
know flagella is present question number
eight differentiate between
gametogenesis and embryogenesis now as
the names is gamma new generation since
formation of gametes and embryogenesis
is formation of embryo from gabot so
gametogenesis is formation of gamete and
rio Genesis's development of M prior so
where does gametogenesis of occur before
fertilization so it is a part of pre
fertilization event and embryogenesis it
will occur after fertilization so it is
a post fertilization event in order to
form gametes meiosis is involved because
mostly it is formed from the employer
sites whereas what for the formation of
a bribe from gamete from the cyborgs
repeated mitosis is important because
repeat itself infinitely we should send
it
action leads to the formation of Emperor
question number nine describe the post
fertilization changes in a flower what
happens after fusion has taken place as
I mentioned before also that the zygote
will undergo a lot repeated divisions
and it will form the embryo the
fertilized of you and ov you will turn
into the seed and the ovary will become
the fruit so over he will from the fruit
with a thick wall called fairy card like
how you see in a mango it has got an
outer covering so that covering is
called Palekar now other parts like
petals and sepals they all fall off so
these are the post fertilization changes
and a flower so as you can see in this
picture the ovary turns into the fruit
the ovule turns into the seed and the
design pod turns into the embryo which
is there inside the seed so with this we
have reached towards the end of this
lesson
I owe that this very first lesson of
class 12 would have helped you so see
you all in the next lesson thank you
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