NCERT Solutions Class 6 Science Chapter 8 Body Movements

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.

Answer:

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.

Question. The figure of the human skeleton is given. Which arrow points to the hip joint?

(a) A
(b) B
(c) C
(d) D

Answer : B

Question. Our backbone is
(a) one large bone which is flexible.
(b) made up of several small bones attached to each other.
(c) a thick rigid muscle which can bend.
(d) made up of two bones with a joint in between.

Answer : B

Question. In this figure, what are the conditions of muscle G and H when we bend our elbow?

(a) Muscle G is contracted and H is relaxed.
(b) Muscle G is relaxed and H is contracted.
(c) Both muscle G and H are relaxed.
(d) Both muscle G and H are contracted.

Answer : B

Question. After we take a deep breath our lungs would look like
(a) a balloon without air.
(b) a balloon filled with air.
(c) a beaker filled with water.
(d) an empty beaker.

Answer : B

Question. The figure shows an X-ray photograph of the human hand. Which of these statements about X-rays is likely to be true?

(a) They can pass through human bones.
(b) They can pass through muscles but not bones.
(c) They make the human body translucent.
(d) They absorb light from the human body.

Answer : B

Question. The number of bones in an adult human body is about:
(a) 42
(b) 76
(c) 206
(d) 392

Answer : C

Question. Which of the following joints would allow rotational motion about MORE THAN one axis?

Answer : A

Question. Which of the joints in the human body allows motion similar to the hinge shown in the picture?

(a) A
(b) B
(c) C
(d) D

Answer : D

Question. Which among the following SHOULD NOT BE DONE if a person is suspected to have a sprain or fracture?
(a) Putting a cold water pack on the affected area
(b) Massaging the affected area with oil
(c) Giving sufficient support to the affected area
(d) Giving enough room for the person affected to breathe

Answer : B

Question. A door hinge is a joint that can move only in one direction. In the human body, which among the following joints is similar to this?
(a) Elbow joint
(b) Thigh and hip joint
(c) Arm and shoulder joint
(d) Wrist joint

Answer : A