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______________
(d) The contraction of the _____________ pulls the bones during the movement.
Solution 1. (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.
(d) The contraction of the muscle pulls the bones during the movement.
Question 2. Indicate ‘true’ and false’ 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.
Solution 2. (a) The movement and locomotion of all animals is exactly the same. False
(b) The cartilages are harder than bones. False
(c) The finger bones do not have joints. False
(d) The fore arm has two bones. True
(e) Cockroaches have an outer skeleton. True
Question 3. Match the items in column I with one or more items of column II:
| Column I | Column II |
| i. Upper jaw | a) Have fins on the body |
| ii. Fish | b) Has an outer skeleton |
| iii. Ribs | c) Can fly in the air |
| iv. Snail | d) Is an immovable joint |
| v. Cockroach | e) Protect the heart |
| f) Shows very slow movement | |
| g) Have a streamlined body |
Solution 3.
| Column I | Column II |
| Upper jaw | is an immovable joint |
| Fish | Have fins on the body, and have a streamlined body |
| Ribs | Protect the heart |
| Snail | Has an outer skeleton, and shows very less movement. |
| Cockroach | Can fly in the air, and b. has an outer skeleton. |
Question 4. Answer the following questions:
(a) What is a ball and socket joint?
(b) Which of the skull bones are movable?
(c) Why can our elbow not move backwards?
Solution 4. a) when the hollow space of one bone is occupied by a rounded end of another bone is known as ball and socket joint of. These type of joints allow movement in all directions.
Example: shoulder and hip
- b) lower jaw is movable
- c) our elbow cannot move in backward directions because it possess a hinge joint. The hinge joint allows only one directional movement.