NCERT Solutions Class 6 Science Body Movements

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NCERT Solutions for Class 6 Science for Biology chapter 08 Body Movements

Exercises

Question.1 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 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 muscles pulls the bones during movement.

Question.2. Indicate true (T) and false (F) among the following sentences.

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

Answer:

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

Question.3. Match the items in Column I with one or more items of Column II.

Column I

Column II

Upper Jaw

have fins on the body

Fish

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

 

Fish

have fins on the body, have a streamlined body

Ribs

protect the heart

Snail

shows very slow movement

Cockroach

can fly in the air, has an outer skeleton

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 type of joint that allows movement in all directions. It is a joint in which a rounded surface of bone moves within a cup-like cavity of another bone. Ball and socket joint is present in shoulder joint and hip joint.
b)Lower jaw of the skull bone is movable.
c) Our elbow cannot move backward because it has hinge joint which only allows movement in one plane.



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