6th Standard Science (Body Movements )

 Body Movements

I.Fill in the blanks:

1) Joints of the bones help in the movement of the body.

2) A combination of bones and cartilages forms the skeleton of the body.

3) The bones at the elbow are joined by a hinge joint.

4) The contraction of the muscles pulls the bones during movement.

II.Indicate true (t) and false (f) among the sentences

a) The movement and locomotion of all animals is exactly the same (F)
b) The cartilage are harder than bones (F)
c) The fingerbone do not have joints (F)
d) The fore arm has two bones (T)
e) Cockroaches have an outer skeleton (T)

 

III .Match the following:

Column I                    Column II

1) Upper jaw)             is an immovable joint    1

2) Fish                       have a streamlined body    2

3) Ribs                       protect the heart.    3

4) Snail                      shows very slow movement    4

5) Cockroaches          can fly in the air.    5

 

IV.Answer the following

1) What is a ball and socket joint ?
Ans: In a ball and socket joint, the rounded end of one bone fits into the cavity (hollow space) of the other bone. It can allow movements in all directions.

2) Which of the skull bones are movable?
Ans: Lower jaw bone is the only movable bone in the skull bone.

c) Why can elbow not move backwards?
Ans: Elbow joint has hinge joint. This joint allows movement in a plane only and hence it is not able to move backwards.