Introduction to Plant growth and development Video Lecture - NEET

hello friends this video on plant growth
and development part 1 is brought to you
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topics to be covered in this lesson our
introduction growth differentiation D
differentiation and re differentiation
development plant growth regulators and
photoperiodism so plant growth and
development I don't really need to
introduce this lesson as the name is
self-explanatory so we are going to talk
about the growth of plants we all will
have seen small plants not only plants
even the seeds growing into huge plants
right in our garden
guna often above planted a very small
plant a tiny one and over a period of
time maybe over few weeks or and a few
months you can actually see the plant
growing not only growing in hang it but
also growing in width the number of
leaves are increasing the the thickness
of the stem is also increasing so it
actually grows in all aspects so here in
this lesson we are going to talk about
those mysteries inside a plant which
helps it to grow so what are those
substances present in a plant which
actually promotes their growth or which
actually tries to inhibits inhibit the
growth so we will dedicate this lesson
on growth and development of a plant so
throw that development these two don't
sound quite similar but they are not
actually similar so here we also look at
what do we mean when we say development
of a plant so we'll have a look at that
as well so with this brief idea in my
we will start our discussion on truth
and development of a plant so the first
question is what what is truth now I
think all of us are aware of the term
growth we even all of us were growing
when we were kids our mothers used to
tell it okay eat well drink milk so that
you grow to a healthy person because not
it was not on your height which was
growing but everything was like
increasing with her age for example copy
on your fingers with the side kind of
lingers you had around say 15 16 years
back they are different right so you
have grown in all aspects so what is
that growth and how do you define growth
it is definitely something increasing of
course so how do we define it it is a
positive change over a period of time so
whenever we see if something is growing
we always means a change which is
positive if I say I mean we also use
this term growth not only for living
organisms but also for nonliving objects
like mud we often say that okay that
person is growing in this carrier what
do we mean that means he is getting
promoted
it is carrier he was doing better in his
career and that means we see okay his
growing in some house we see that his
money is growing that means whatever
money he has left in the bank or maybe
invested in some business that is
growing so the money is actually
increasing so the growth the term growth
always indicates a positive change over
a period of time now this change can be
in terms of size this change can be in
terms of weight or height so the
parameter can be
thing so when I say growth it is a
positive change over a period of time so
look at this infant and the baby
elephant so even the added elephant was
also a baby elephant so this
transformation took place did not take
place suddenly it took place over a
period of time so the growth took place
over a period of time this is an
irreversible change this is very very
important now you cannot reverse it back
now you cannot ask this added elephant
to become a baby elephant that is not
possible right so that is how it is an
irreversible change you cannot reverse
it back so you compare yourself we also
have a come across this irreversible
change we have a small kids and then we
gradually grow up to an adult too
similar is the case and each of plants
as well a plant which is already grown
up cannot go back and become smaller so
this is growth now brought as a whole
occurs due to many processes taking
place inside the body of a living
organism
when I say metabolic processes that
means there are many reactions taking
place inside our Dorothy they can be
anabolic or catabolic that means
reactions where complex molecules have
been broken down into smaller ones or
smaller molecules joining up to form
bigger ones
so both kind of processes are there and
of course these metabolic processes take
place inside the body of a living
organism and the cost of energy so you
need energy to grow and as I mentioned
quite a number of times that we all eat
food to get energy and we need energy to
do almost anything that is for free so
whatever each of the cells of the body
is doing whether they are preparing food
for us or they are synthesizing
ATP so whatever they are doing they all
need energy so even for growth you need
some energy so if there is no energy
that person cannot grow for example you
would have seen that people who are like
the poor people who do not have enough
money to eat good food so what happens
if they are starving for a long time you
can actually see that the growth in
their body is not proper the weight of a
child who has not been fed properly is
not the right to be I mean he's always
under way wait
that is because he does not have
sufficient energy for the appropriate
amount of growth so now the next
question is what is development now if
you say then okay growth and development
and all the same thing then tell me what
is it again developing is not the term
which we all come across in our
day-to-day life I mean we often use this
word development so what is that we
often use it in context of the
development of the country we often say
okay the country is not developing other
than you has already developed a lot so
what is that development it refers to
the overall changes that a plant until
goes throughout its life cycle so when I
talk about growth and talking about the
increase in some parameter maybe
increase in height or increase in weight
or increase in size so there is an
increase or a positive change of
somebody for a parameter over a period
of time that is growth but when I say
development I do not mean just a
positive change it means all the changes
that take place in the life of a plant
now when you say life of a plant from
where there is the life of the on start
it starts from a sin seed right so that
you germinate a seed and then it forms a
seedling and then a small time the plant
gradually grows and matures to from a
bigger plant and gradually over a period
of time it turns into a huge tree so if
you compare it starting
from that seed so from seed to the huge
tree there are several changes that took
place right the shape of the seed was
something else now the tree looks
something else there are leaves so many
leaves and back flowers fruits which
were not there when it was a seed so all
these changes that the plant underwent
throughout its lifecycle that is kind of
luck med so when the plant actually goes
through all these phases in its life we
say that the plant is developing we
don't say that the plant is growing of
course it is growing because it is also
increasing in size so basically growth
is just one part of development when we
say development we not only mean growth
but we also mean other changes that take
place in the life cycle of the plant for
example the germination of seed that is
a process where the seed turns into a
sibling and the sibling gradually gives
rise to a plant so when the seedling is
giving rise to a plant the shape and so
many things the structure everything
changes right so you cannot fall that as
growth because in growth it is just that
increase in size or increase in some
parameter so that is known as
development so please try to understand
the difference between growth and
development when you talk about growth
it has to be one particular parameter
which is a going through a positive
change over a period of time
when you talk of development it refers
to all kind of changes that take place
throughout the lifecycle of that so
growth is also a part of development so
when you talk about development of a
plant it includes various processes
because the life cycle of a plant passes
through several processes like embryo
formation the formation of the embryo
after the reproduction take place seed
germination of course plant maturation
formation of flowers and fruits again
seed formation so you see this
cycle so the life of starts from the
seed seed germinates seedling small
plant the plant was mature to become a
big plant so that plant will again have
the reproductive structures like the
fruits and the flowers so it will again
another in production result of the
production would be a seed and the seed
will again give rise to another plant
right so in this like entire lifecycle
this all these are different processes
so these all processes together is known
as development so here you can see the
life cycle actually so this is your seed
which gradually terminates to a small
plant and this plant will gradually be
or the reproductive structures like the
flowers or the fruits so it becomes a
mature plant now so this time will again
undergo reproduction and it will be
brains to seeds and the seeds will again
form sidling so this is how the life
cycle of a plant will continue so
development will always refer to all
these different processes which are part
of the life cycle of a plant but when we
talk about growth it just means some
particular type of detail is increasing
with time so that is effort to as grow
so you can't please remember that growth
is just one part of development so let
us quickly have a convolution between
growth and development so when I talk
about growth I am actually talking about
the quantitative changes quantitative
something which you can quantify
something which you can measure right
because it is an increase in size
whether it is increase in height or
weight or area or volume or increase in
the number of cells so you can actually
measure it how much is the increase so
that means you have measured it where is
development is qualitative changes
whereas when you talk about the beloved
they represent the qualitative changes
for example
everything is not measurable now let us
take the example of the life cycle of a
plant
now when the seed changes into a
settling or when the setting changes
into a young plant you actually cannot
measure how much did it develop right so
it is not a very quantitative or a
measurable quantity but growth is
definitely quantitative growth is a part
of development as I said before also
development is the overall change so
growth is just one part of development
growth continues till maturity or length
later so in some plants growth stops
after a certain period of time for
example the seed develops becomes a
seedling then it becomes a plant now
that plant will grow right it will
increase in size the leaves will also
increase in size but in some plants the
growth will stop at a certain time for
example the size of the leaves might
increase only up to a certain size after
that will not increase so for growth it
it does not continue throughout the life
cycle it continues only for a certain
period whereas if you talk about
development it continues forever when I
say forever it starts from the formation
of seed when the seed also is not formed
from there it starts and then the seed
forms a sibling of plant plant grows
matures again from the reproductive
structures and till the plant dies
development continued because
development means the different
processes which are taking case in the
life cycle of a plant so some of other
processes will be taking place right so
the process of development will continue
forever starting from
to death of a plant but growth will
continue only for a certain period
changes and growth are measurable
because they are quantitative changes
but in development changes are not
measurable but they can be assessed for
example right now
okay the plant is in the stage of a
sibling so you can assess how much did
it develop but you cannot actually
mention how much is the development of
the plant right so that is how we can
differentiate between growth and
development so now we will talk a little
more about growth we will try to see one
of the different types of growth and how
what are the conditions required for a
plant to grow so let us talk more about
growth so here I have shown in the
picture the difference between growth
and development thank you please visit
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