Q.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.
NCERT Solutions for Class 6 Science Chapter 8 Body Movements
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 muscles pulls the bones during movement.
Q.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. ( )
NCERT Solutions for Class 6 Science Chapter 8 Body Movements
Answer :
(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 fore arm has two bones. ( T)
(e) Cockroaches have an outer skeleton. ( T)
Q.3 Match the items in Column I with one or more items of Column II.
NCERT Solutions for Class 6 Science Chapter 8 Body Movements
Answer :
Column I. Column II
Upper jaw
Fish
Ribs
Snail
Cockroach
Q.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?
NCERT Solutions for Class 6 Science Chapter 8 Body Movements
Answer :
(a) The rounded end of bone fits into the cavity of the other bone. Such a joint allows movements in all directions is called ball and socket joint.
(b) Lower jaw
(c) Elbow cannot move backwards because it has hinge joint which allows movement in only one direction.