NCERT Solutions for Class 6th Science: Chapter 8 – Body Movements

NCERT Solutions for Class 6th Science: Chapter 8 – Body Movements

National Council of Educational Research and Training (NCERT) Book Solutions for Class 6
Subject: Science
Chapter: Chapter 8 – Body Movements

Class 6 Science Chapter 8 Body Movements NCERT Solution is given below.

Question 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.

Question 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) 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)

Question 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:

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

Question 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. It consists of a bone that has a round head, which fits 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.

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