Class 6th Science written work Ch 8 Body Movements

 Exercise Questions

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.

Solution:

(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.

2. 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 finger bones do not have joints. ( )

(d) The fore arm has two bones. ( )

(e) Cockroaches have an outer skeleton. ( )

Solution:

a) False

b) False

c) False

d) True

e) True

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

Solution:

Column I	Column II
Upper jaw	Have fins on the body
Fish	Has an outer skelton
Ribs	Can fly in the air
Snail	is an immovable joint
Cockroach	Protect the heart
	Shows very slow movement
	Have a streamlined body

Solution:

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	Has an outer skeleton and Shows very slow movement
Cockroach	Has an outer skeleton and 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?

Solution:

a) The rounded end of one bone fits into the cavity (hollow space) of the other bone. Such a joint allows movements in all directions, which is called ball and socket joint.

b) Lower jaw

c) Our elbow cannot move backwards because it has hinge joints which only allow back and forth movement.

Some Important Questions

Question 1.
How many types of joints are there in our body? Name them.
Answer:
There are five types of joints in our body:

1. Ball and socket joints
2. Hinge joints
3. Gliding joints
4. Pivotal joints
5. Fixed joints.

Question 2.
Name the three components of skeleton.
Answer:
Skeleton is made up of different bones, joints and cartilage.

Question 3.
Name various parts of skeletal system.
Answer:
The skeletal system can be divided into following main parts:

• Skull
• Back bone
• Limb bones
• Chest bones
• Shoulder bones
• Hip bones.

Question 4.
What is the function of skeleton?
Answer:
The function of skeleton is:

• It forms the framework of body,
• It gives shape and structure to the body.
• It protects the internal organs.
• It helps in the movement and keeping body erect.
• Ribs of chest help in breathing.

Question 5.
At which point does the arm rotate?
Answer:
The arm rotates on the round pit like structure.

Question 6.
Which is the longest bone in your body? Measure it with your scale.
Answer:
Femur is the longest bone in our body. It is a thigh bone.