NCERT class 6th science chapter 8 body movements, free solution ncert class 6th, class 6th free solution, free solutions body movements

Chapter 8

Body Movements

We have been using our body voluntarily or involuntarily, we walk, run, jump, sit, etc. We move with the help of our legs and different organisms move differently for example:
Cow moves with the help of Legs, movement of the snake is called Slither or crawl, Insect moves by Creeping.
 
Human Body and Movements
While doing physical exercise we can observe different movement for example
ØRotation of arm
Ø Bending of the waist
Ø Raising legs
Ø Rotating neck, etc.


Different Movements, body movements
Different Type of Movements 


We can rotate some parts fully and some parts partially due to the presence of Joints. A joint is a place where two parts of body joints, eg, joint at the neck, joint at the elbow, joint at the knee, etc.
         

Ball and Socket Joint (spheroid joint)
You can imagine mortar and pestle, in which you can fix pestle in the mortar and do the movement. These kinds of joints allow movement in all direction
For Example, hip and shoulder joint.

Ball and Socket Joint, body movements, NCERT class 6 science chapter 8
Ball and Socket Joint

Pivotal Joint (trochoid joint, rotary joint, lateral ginglymus)
It is a freely moveable joint and allows movement around the single axis. Examples neck, Radius-Ulna in hand.


Hinge Joints
These joints allow movement in one plane or one direction. For example ankle, knee, elbow, and interphalangeal joints.

Hinge Joints, ncert class 6 science, body movements
Hinge Joints


Fixed Joint
There are some bones in our head are fixed and can’t move, for example, Upper Jaw fixed with the skull.

Upper Jaw is an example of Fixed Joint, body movements, ncert class 6 science
Upper Jaw is an example of Fixed Joint
                                             
Skeleton
Provide scaffolding or framework to the body. As we all know there are 206 bones in the body. We can see bones with the help of X-Ray, MRI, and CT- Scan.

Skeleton, body movements, class 6 science, ncert class 6 science
Skeleton


Chest Structure/Rib Cage
The rib cage protects our heart and lungs. Rib cage possesses 24 ribs (12 pairs), 7 are true ribs and 3 are false ribs and 2 are false and floating ribs.
                                            
Rib Cage, ncert class 6 science, chapter 8 movements
Rib Cage

Pectoral and Pelvic Girdle
Shoulder bone called as Pectoral girdle and lower part of the torso have as Pelvic girdle (Contains bladder and reproductive organs).


Pectoral and Pelvic Girdle, shoulder blade, hip joints, clavicle, collar bone
Pectoral and Pelvic Girdle
                        

Cartilage
Cartilage is a type of soft tissue and present at the end of the bones and protect by acting as padding in joints. These tissues are soft and flexible and also present at, Pinna of the ear, the lower part of the nose.

Cartilage of ear and nose, cartilage, ncert science class 6
The cartilage of Ear and Nose

Muscles
It is a type of soft tissues; muscles have filaments, which make muscles to work and help in motion and the functions of the bones.
     
Working of Muscles, muscles, ncert, body movements, ncert class 6 science
Working of Muscles


GAIT of Animals (GAITà Way of walking)
Aristotle's book, written in 350 BC, he has written this on the basis of the pattern of the limb's movement over a solid substrate.

Earthworm
We have observed that the body of the earthworm is made of many rings, and doesn’t have bones but has muscles that contract and relax. This contraction and relaxation make earthworm to move forward or backward.

Earthworm and movement in Earthworm,Earthworm, ncert class 6 science solution, body movements
Earthworm and movement in Earthworm

They also secrete slime which makes them slide through the soil, and have  bristles on each which help them to hold with the soil, Earthworms eat soil, garbage and make vermicomposting.

Snail
They have an outer hard shell made of calcium; they don’t have any moving parts. It also secretes slime which helps to move easily with sliding motion with the help of muscles.
                    
Snail, ncert class 6 sceince, body movements
Snail
Cockroach
We all know it can walk, run and fly as well.
It has:
  • 3 pairs of legs
  • 2 pairs of wings
  • 2 antennas


It has distinct muscles near the legs help in walking and breast muscles help in flying.

Cockroach, NCERT class 6, American cockroach
Cockroach

Birds
  1. Fly in air and walk on the ground, some birds can swim like duck and swan, etc.
  2. They have pneumatic bones means they have porous bone which makes them light weight so they can fly easily.
  3. Their forelimbs are being used for flying and hind limbs for walking.
  4. Their breastbones are modified to hold muscles of flight. 
Humming Bird, NCERT class 6 chapter 8 body movements, www.educationphile.com
Humming Bird

Fish
They have streamlined body which means have body tapering at both ends so that Water can flow easily.

 
streamline body of fish. ncert class 6 science chapter 8, body movements,
Streamline Body (Tapering at both ends)

Muscles movement makes fish swim, and they have fins which help to balance and provide the ability to steer or stabilize motion while traveling in water, air, or other fluids.

fish, fish fins, ncert class 6 science, body movements
The Fish

                        
Snake
They have interconnected backbone, ribs and skin. Each loop of connected bones gives a forward push. Snakes rely on muscles and scales. The scales are made up of a material called keratin, and these scales help to hold the surface and move by muscle action.

slithering, snake slithering, slithering movement, body movements, class 6 science
Snake and its backbone




Exercise

1. Fill in the blanks:
(a) Joints of the bones help in the movement of the body.
(b) A combination of bones and cartilages forms the Skeleton of the body.
(c) The bones at the elbow are joined by a Hinge joint.
(d) The contraction of the muscles pulls the bones during movement.

2. Indicate true (T) and false (F) among the following sentences.
(a) The movement and locomotion of all animals is exactly the same. (F)
(b) The cartilages are harder than bones. (F)
(c) The finger bones do not have joints. (F)
(d) The forearm has two bones. (T)
(e) Cockroaches have an outer skeleton. (T)

3. Match the items in Column I with one or more items of Column II.

Column I
Column I
Upper Jaw
Have fins on the body
Fish
Has an outer skeleton
Ribs
Can fly in the air
Snail
Is an immovable joint
Cockroach
Protect the heart

Shows very slow movement

Have a streamlined body


Solution:
Column I
Column I
Upper Jaw
Is an immovable joint
Fish
Have a streamlined body
Ribs
Protect the heart
Snail
Shows very slow movement
Cockroach
Has an outer skeleton


4. Answer the following:
(a) What is a ball and socket joint?
Answer: The end of the bone fixed or joint in a cavity, which allows free movement of the joint.

(b) Which of the skull bones are movable?
Answer: The lower jaw of the skull bone is movable.

(c) Why can our elbow not move backward?
Answer: Due to the presence of a hinge joint, we can not move our elbow backward. The hinge joint allows only one-way movement.

Keywords: Backbone, Ball, and socket joint, Bristles, Cartilage, Cavity, Fixed joint, Gait of animals, Hinge joint, Muscle, Outer skeleton, Pelvic bones, Pivotal joint, Rib cage, Shoulder bones, Skeleton, Streamlined, CTET, CTET Paper-II,
KVS

References: NCERT 6th class book


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