NCERT Solutions for Class 6 Science Chapter 8 body Movements

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) movement
(b) skeleton
(c) hinge
(d) muscle

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) False
(b) False
(c) False
(d) True
(e) 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 moveable joint. The 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 movement back and forth. Therefore, we cannot move our elbow backwards.

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