Q1. 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 and of the ———- pulls the bones during movement.

Ans :- 1. Fill in the blanks:
(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 hinge joint.
(d) The contraction and of the muscles pulls the bones during movement. 

Q2. 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.

Ans -: True/False
(a) F
(b) F
(c) F
(d) T
(e) T 

Q3. 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                                                              streamlined body.

Ans :- 

Column I                                          Column II

Upper jaw                         Is an immovable joint.    
Fish                                    Have fins, have a streamlined body  Ribs                                   Protect the heart.                                 Snail                                  Shows very slow movement.
Cockroach                        Have an outer skeleton, can fly in air

Q4. 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?

Ans :- (a) The rounded end of bone fits into the cavity of the other bone. Such a joint allows movements in all directions.
(b) Lower jaw
(c) Elbow cannot move backwards because it has hinge joint which allows only back and forth movements.