1.
Fill in the blanks:
(a) Joints of bones help in the _________ of
body.
(b) A combination of bones and cartilages
forms the _________ of the body.
(c) Bones at the elbow are joined by a
_________ joint.
(d) The contraction of the _________ pulls
the bones during movement.
Answer.
(a) Joints of bones help
in the movement of body.
(b) A combination of
bones and cartilages forms the skeleton of the body.
(c) Bones at the elbow
are joined by a hinge joint.
(d) The contraction of
the muscle pulls the bones during movement.
2.
Indicate true (T) or false (F) for the following sentences.
(a) Movement and locomotion of all animals is
exactly the same. ( )
(b) Cartilages are harder than bones. ( )
(c) 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 in Column II.
|
Column I |
Column II |
|
Upper jaw |
have fins on the body |
|
Fishes |
has an outer skeleton |
|
Ribs |
can fly in the air |
|
Snail |
is an immovable joint |
|
Cockroach |
protect the heart |
|
shows very slow movement |
|
|
have a streamlined body |
Answer.
Correct matches of column I with column II
are given below:
|
Column I |
Column II |
|
Upper jaw |
is an immovable joint |
|
Fishes |
have a streamlined body; have fins on the body |
|
Ribs |
protect the heart |
|
Snail |
shows very slow movement |
|
Cockroach |
has an outer skeleton; can fly in the air |
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) Ball and socket joint is a movable joint.
In this a bone with round head fits into hollow space of another bone. This
makes the bone to rotate freely. For example, bones of hip and shoulder can
move in all directions due to ball and socket joints.
(b) Lower jaw bone (Mandible bone) is
the only skull bone which is movable.
(c) Our elbow cannot move backwards because
it has a hinge joint which allows the movement in one plane only.
Solution of Exercises of
Chapter 1; Food: Where does it come from.
Solution of Exercises of
Chapter 2; Components of Food.
Solution of Exercises of
Chapter 3; Fibre to Fabric.
Solution of Exercises of
Chapter 4; Sorting Materials into Groups.
Solution of Exercises of
Chapter 5; Separation of Substances.
Solution of Exercises of
Chapter 6; Changes around us.
Solution of Exercises of
Chapter 7; Getting to Know Plants.
Solution of Exercises of
Chapter 8; Body Movements.
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