NCERT Solutions for Chapter 8 Body Movements Class 6 Science
Short Notes for Class 6 Science Chapter 8 Body Movements
Bones and cartilage form the skeleton of the human body. It gives the frame and shape to the body and helps in movement. It protects the inner organs. The human skeleton comprises the skull, the back bone, ribs and the breast bone, shoulder and hipbones, and the bones of hands and legs. The bones are moved by alternate contractions and relaxations of two sets of muscles. The bone joints are of various kinds depending on the nature of joints and direction of movement they allow. Strong muscles and light bones work together to help the birds fly. They fly by flapping their wings. Fish swim by forming loops alternately on two sides of the body. Snakes slither on the ground by looping sideways. A large number of bones and associated muscles push the body forward. The body and legs of cockroaches have hard coverings forming an outer skeleton. The muscles of the breast connected with three pairs of legs and two pairs of wings help the cockroach to walk and fly. Earthworms move by alternate extension and contraction of the body using muscles. Tiny bristles on the underside of the body help in gripping the ground. Snails move with the help of a muscular foot.
Chapter Name | Body Movements NCERT Solutions |
Class | CBSE Class 6 |
Textbook Name | Science |
Related Readings |
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Question 1: Fill in the blanks:
(a) Joints of the bones help in the _______ of the body.
(b) A combination of bones and cartilages forms the _______ of the body.
(c) The bones at the elbow are joined by a _______ joint.
(d) The contraction of the ________ pulls the bones during movement.
Answer
(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 muscle pulls the bones during movement.
Question 2: Indicate true (T) and false (F) among the following sentences.
(a) The movement and locomotion of all animals is exactly the same. ( )
(b) The cartilages are harder than bones. ( )
(c) The finger bones do not have joints. ( )
(d) The fore arm has two bones. ( )
(e) Cockroaches have an outer skeleton. ( )
Answer
(a) The movement and locomotion of all animals is exactly the same. (False)
(b) The cartilages are harder than bones. (False)
(c) The finger bones do not have joints. (False)
(d) The fore arm has two bones. (True)
(e) Cockroaches have an outer skeleton. (True)
Question 3: Match the items in Column I with one or more items of Column II.
|
Column I |
Column II |
|
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 |
Answer
|
Column I |
Column II |
|
Upper jaw |
is an immovable joint |
|
Fish |
have fins on the body, have a streamlined body |
|
Ribs |
protect the heart |
|
Snail |
shows very slow movement |
|
Cockroach |
has an outer skeleton, can fly in the air |
Question 4: Answer the following:
(a) What is a ball and socket joint?
(b) Which of the skull bones are movable?
(c) Why can our elbow not move backwards?
Answer
(a)A ball and socket joint is a movable joint. It has a rounded end of one bone fit into the cavity (hollow space) of the other bone. It allows movement in all directions. Example: shoulder joints.
(b)Only the lower jaw in skull bones is movable.
(c) Elbow joint is an example of hinge joint which allows only back and forth movements. Therefore, we cannot move our elbow backwards.