CBSE Class 6 Science Chapter 8 Body Movements NCERT Solutions

CBSE Class 6 Science 

Chapter 8: Body Movements

NCERT Solutions

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) muscles

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

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

Answer:

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

             has an outer skeleton

Cockroach -- can fly in the air

                      has an outer skeleton

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) In ball and socket joint,  the rounded end of one bone fits into the cavity (hollow space) of the other bone.  Such a joint allows movements in all directions

(b) Only lower jaw is movable in skull.

(c) Joint in elbow is hinge joint, which allows movement only in one direction. Hence we cannot move our elbow backwards.