Class 6 Science - Body Movements Movement in Fish and Snakes

hello friends this video on body
movements part 22 is brought to you by
exam for calm no more fear from exam
then comes fishes so fishes are those
organisms which live in water so if we
have to talk about the movement of
fishes it becomes important to talk
about their body shapes because their
body shapes play a very important role
their unique body shape enable their
movement in water so this type of body
shape is called streamlined body so
before we talk about how fishes move let
us understand the concept of streamlined
body so about any body is said to be
streamlined if its shape offers least
possible resistance to the moving water
now if you want anything to move in
water then that object should give
minimum resistance with that that
particular object should not oppose the
movement of water it should just allow
water to move and with that water it
itself moves so that should be the
concept so therefore if we want any
object to move in water its shape has to
be designed in such a way that it does
not offer resistance resistance needs
opposition so it should not oppose the
movement of water now let us think of a
paper boat so you you would have often
made a paper boat with a piece of paper
now have you ever noticed that if you
put this paper boat in water what
happens it starts moving with the wood
moving water right now have you ever
noticed how does it move it normally
moves in this fashion so let's say the
water is flowing like this in this
direction so how does the boat move so
the boat moves in this direction and it
since actually that the tapered ends
they are like along the direction of
water right so when you in fact when you
make a boat you make it in this shape
such that it is broad in the middle but
it is tapered at the ends so both the
ends are tapered and it is broad at at
the between and then when it moves on
water the tapered ends they lie along
the direction of the water flow now just
try doing this so let's say that you
take two paper boats okay you make two
paper boats and then you try to make it
move on water so in one case you try to
put it put a force in this direction
that is you just push it in this
direction in the water and in the other
case you try to push it from this
direction that is from the flat surface
from the broad between so from between
you are giving a force to make it move
like this on water and in this case in
first case we are giving a force towards
the tapered end and make it move like
this so what do you observe you will
observe that this boat will start moving
very comfortably but this one the second
scenario would never move like this it
will again by itself change its
direction like this and then it will
start moving so you cannot make it move
in this fashion why is it that that is
because this particular shape where you
have people ends and it flows in this
fashion that is along the direction of
water in that case it offers minimum
resistance to water so therefore it can
comfortably wiggle water but in the
second case it can't so just try this
out try this activity yourself and you
would understand what I am trying to say
so please try this out so we find that
body tapered at both ends offers less
resistance to moving water so therefore
you will
at all the organisms that move in water
they have tapered ends now you look at
the shape of a fish so you see this end
is tapered this end is also tapered and
in between it is like broad so broad in
between papered and ends that is the
streamlined shape for any object to move
in water because in this shape and
officials also they will also move in
such a way that the tapered ends always
lie along the direction of the flow of
water so if water is flowing in this
direction the fish will move even in
this direction in this direction now
when you talk about movement in fishes
again mussels play an important role so
strong muscles on the skeleton help in
swimming mussels make the front part of
the body moving on one side and the tail
moves towards the opposite side so
that's how the fishes move so if you
have ever seen these these structures
which they have they are the fins and
the tail of the fish helps them to
change direction so main purpose of tail
is to change direction while swimming
and the fins they help to control the
balance because every dive reduce water
so they need to control the balance of
the water and their weight or that so
controlling balance and handled by those
fins so balance control so if you ever
see a fish moving you will see that it
keeps moving in in a wavy fashion so the
mussels first make the front part of the
body move in one direction like in this
case the body is moving in this
direction and then again in the other
direction and the tail moves just the
opposite way so that is why you get this
wave-like
shapes
and with these kind of movements it
gradually moves forward so now finally
we will talk about snakes now as I have
discussed before that snakes also do not
have a vertebral column so they cannot
stand or sit so but they can again crawl
on the ground so how do they move they
move into skulls little because they
with baby movements again they all
should not move straight effort but they
move forward by pressing against the
ground by pushing the ground backward
they tend to move forward so they are
elongated carnivorous reptiles that is
they eat other animals so other big and
small animals are eaten by snakes
because the size of the snakes also
baggy there are a lot of snails which
are big enough to eat a human being also
so when you look at their backbone they
have a very long backbone so the entire
backbone to the type of the backbone
that they have is little different from
what we have the tail back food is very
long because of which they can move so
that also helps in movement however they
do not have legs so as such they cannot
walk or run but their muscles help in
their movement so let's see how exactly
they move they have thin muscles and
escapes which help in their movement and
these muscles are present throughout
their body
the snakes move very very fast and they
never move in a straight line you would
have always seen snakes moving like this
so what they do is they place the ground
with one part of their body and move
forward again depress the ground with
the second part of their body and move
forward so that that's how they key
moving now due to the presence of these
three muscles throughout their body so
their movement is different from the
movements of earth-1 so you might say
that the earth mom also moved somewhat
like this but not really because in
earth once they had muscular bristles
and with the help of those bristles
they moved but in case of snakes they
have muscles three muscles throughout
their body and it will then help they
move in this curvy fashion and this
little thank you please visit
www.payoor.com to watch more educational
videos with a better experience please
do not forget to Like and subscribe to
our YouTube channel for latest updates
thank you once again