Science STD 6 Chapter 5: Body Movements - Exercises

1. Fill in the blanks:

1. Joints of the bones help in the ............. of the body.

   movement

2. A combination of bones and cartilages forms the ............. of the body.

   skeleton

3. The bones at the elbow are joined by a ............. joint.

   hinge

4. The contraction of the ............. pulls the bones during movement.

   muscle

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

1. The movement and locomotion of all animals is exactly the same.

   False.

2. The cartilages are harder than bones.

   False.

3. The finger bones do not have joints.

   False.

4. The fore arm has two bones.

   True.

5. Cockroaches have an outer skeleton.

   True.

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

4. Answer the following:

1. What is a ball and socket joint?

   A ball and socket joint is a type of joint where the rounded end of one bone fits into the hollow space (cavity) of another bone. This joint allows movement in all directions.

2. Which of the skull bones are movable?

   The lower jaw is the only movable bone in the skull.

3. Why can our elbow not move backwards?

   Our elbow has a hinge joint, which allows for a back and forth movement, similar to the hinges of a door. It does not allow for backward movement, only bending in one direction.

1. We discussed the many movements our bodies are capable of... think of other ways of restricting normal body movements and find ways that everyday activities could then be managed.