Class 6 Science Chapter 5 Question Answers

(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) 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 joint.
• (d) The contraction of the muscle pulls the bones during movement.

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

(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. It has a 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 only back and forth movements. Therefore, we cannot move our elbow backwards.

Class 6 Science Chapter 8 Solution in Videos