Variation in Size of Cells Video Lecture | Science Curiosity Class 8 - New NCERT

hello friends this video on cell part 5
is brought to you by exam feel calm no
more fear from exam so not only shape
but signs of the cell also matters and
signs of the cell again also shows a
huge diversity so when we talk about
cell size cells exist in a variety of
shapes as well as sizes so signs of a
cell also combining from very small that
is in micrometers till very large which
can be even in centimeters so if we you
talk about the diversity so the smallest
cells would be the sense of bacteria
which might be in the range also if you
talk about signs of bacterial cells they
might range in somewhere around 0.3
microns so somewhere around this would
be the range of some smallest bacterias
now if you talk about a large set so the
largest cell is the ostrich egg so this
is the egg of an ostrich egg of an
ostrich is the largest since so you can
imagine the size of this egg looking at
relating to the size of an adult farm so
it is that big so it completely fills
your palm so the size of this ostrich
egg is in meters it goes up to that it
goes up to that range so this measures
170 mm by 130 mm so this is the
dimension of an ostrich egg so if you
talk about the size it starts from
micron and it goes up to millimeters or
centimeters similarly if you talk about
a Manning and a gap so this is also very
very long so this is a suitable area so
here you see a seater
area this is an alley which is found in
marine water that is sea water citizens
a man named Annie and this is around
five centimeter long so it is quiet long
five centimeter is not small right let
us wait long so that is the science of
this cell now this ostrich egg you might
be wondering I mean why is it so big
because this in kind egg of an ostrich
it contains all the food deposits which
would be needed for the growing embryo
so everything is present inside this egg
again if you talk about a long sin so
one of the longest cell in fact the
longest cell is the nerve cell or neuron
ostrich cell is the biggest sin in terms
of its size but when you talk only about
the length so lengthwise neuron is the
longest cell its length is around one to
two meters so it is that long so it is
one of the longest cells in fact a
suitable area again is also quite long
so again we have another cells which are
of different sizes like the red blood
cells now let us quickly look at the
smallest of the largest cell as I said
science of a cell is independent of the
size of plant or animal now doesn't
matter how big the animal is but the
size of a cell mind to be big or small
so it has nothing to do with the size of
the animal so the smallest cell is that
of bacteria a smallest possible bacteria
between the range of one point 0.1 or
0.2 microns and the largest cell is that
of the egg of an ostrich which is of
dimension 170
by 130 mm so it is not necessarily that
clear since bacteria is a smaller values
of therefore the cells of a bacteria is
one nothing like that it's all about
like for example you should not think
that our anything is bigger than mouths
therefore anything will have large
yourself and that of mouse it is not
like that so it is independent of the
size of the plant or the animal thank
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