Exercise Question:
Que1: Full in the blanks:
(a) Joints of the bones help in ______ of the body.
(b) A combination of bones and crtilages 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 movements.
Ans:
(a) movement
(b) skeleton
(c) hinge
(d) muscle
Que2: 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:
(a) (False)
(b) (False)
(c) (False)
(d) (True)
(e) (Ture)
Que3: Match the item in column I with one or more items of column II.
Column I Column II
Upper jaw have fine on the body
Fish Has an outer skeleton
Rids Can fly in the air
Snail is an immovable joint
Cockroach Protect the heart
shows very slow movement
have a streamlined body
Ans:
Column I Column II
Upper jaw is an immovable joint
Fish have fine on the body, have a streamlined body
Rids Protect the heart
Snail shows very slow movement
Cockroach Has an outer skeleton, Can fly in the air
Que4: 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 more not move backwards?
Ans:
(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 allow only back and forth movements. Therefore, we cannot move our elbow backwards.