NCERT Solutions for Class 6 Science Chapter 5 Body Movements

NCERT
SOLUTIONS
CLASS - 6TH

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Class : 6th
Subject : Science
Chapter : 8
Chapter Name : Body Movements

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 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.

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 nger bones do not have joints. ( )
(d) The fore arm has two bones. ( )
(e) Cockroaches have an outer skeleton. ( )

Answer. (a) Movement and locomotion of all animals is exactly the same. (False)
(b) Cartilages are harder than bones. (False)
(c) Finger bones do not have joints. (False)
(d) The fore arm has two bones. (True)
(e) Cockroaches have an outer skeleton. (True)

Q3 Match the items in Column I with one or more items of Column II.

Answer.

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?

Answer. (a) Ball and socket joint is a movable joint. It consists of a bone that has a round head,
which ts into a cup like depression of another bone. This helps the bone to rotate freely.
Examples of such joints are hip and shoulder joints.
(b) Mandible bone which forms the lower jaw is the only skull bone that is movable.
(c) The elbow has a hinge joint. This type of a joint allows the movement in one plane only.
Therefore, our elbow cannot move backwards.