Class 9 Skeleton: Movement and Locomotion Mock Test (ICSE)

Topics in Skeleton: Movement and Locomotion

• Functions of the skeleton
• Axial and appendicular skeleton
• Types of joints
• Movement and locomotion

Skeleton: Movement and Locomotion practice questions with answers

1. Q1Multiple choice·1 mark
   Which one of the following organisms exhibits movement using pseudopodia?

   1. (a)Amoeba
   2. (b)Earthworm
   3. (c)Paramecium
   4. (d)Hydra
   Show answer and step marks

   1. Correct option: (a) Amoeba+1

   Answer: (a)
2. Q2Multiple choice·1 mark
   Which of the following bones forms a part of the human axial skeleton?

   1. (a)Femur
   2. (b)Scapula
   3. (c)Sternum
   4. (d)Radius
   Show answer and step marks

   1. Correct option: (c) Sternum+1

   Answer: (c)
3. Q3Multiple choice·1 mark
   Which type of joint is present between the cranial bones of the human skull, permitting no movement at all?

   1. (a)Pivot joint
   2. (b)Hinge joint
   3. (c)Gliding joint
   4. (d)Fixed joint
   Show answer and step marks

   1. Correct option: (d) Fixed joint+1

   Answer: (d)
4. Q4Multiple choice·1 mark
   Which of the following delicate internal organs is directly protected by the human cranium?

   1. (a)Lungs
   2. (b)Spinal cord
   3. (c)Heart
   4. (d)Brain
   Show answer and step marks

   1. Correct option: (d) Brain+1

   Answer: (d)
5. Q5Short answer·2 marks
   Name the two main divisions of the human skeletal system and state the total number of bones present in the appendicular skeleton of an adult human.
   Show answer and step marks

   1. First division: Axial skeleton.+0.5
   2. Second division: Appendicular skeleton.+0.5
   3. Number of bones in the appendicular skeleton of an adult: $126$.+1

   Answer: Divisions: Axial skeleton and Appendicular skeleton; Bones in appendicular skeleton: $126$
6. Q6Long answer·4 marks
   Joints play a crucial role in human locomotion and movement. (a) Differentiate between freely movable joints and immovable joints on the basis of the presence of a joint cavity and freedom of movement. Give one example of each. (b) Give the exact location of the pivot joint in the human body and state the specific type of movement it permits.
   Show answer and step marks

   1. (a) Joint cavity: a freely movable joint has a synovial cavity filled with synovial fluid between the bones, whereas an immovable joint has no joint cavity, the bones being held tightly by fibrous connective tissue.+0.5
   2. (a) Freedom of movement: a freely movable joint allows considerable movement, whereas an immovable joint permits no movement.+0.5
   3. (a) Example of a freely movable joint, any one of: knee; elbow; shoulder; hip; or any other valid synovial joint.+0.5
   4. (a) Example of an immovable joint, any one of: sutures between the bones of the cranium (skull); joints between the teeth and the jaw sockets; or any other valid immovable (fibrous) joint.+0.5
   5. (b) Location: between the atlas (first) and the axis (second) vertebrae in the neck. (Also credit the pivot joint between the upper ends of the radius and ulna.)+1
   6. (b) Movement permitted: rotation, i.e. turning the head from side to side (or rotation of the forearm for the radio-ulnar joint).+1

   Answer: (a) A freely movable joint has a synovial cavity with synovial fluid and allows free movement, e.g. the knee; an immovable joint has no cavity, its bones are held by fibrous tissue and it allows no movement, e.g. the sutures of the skull. (b) The pivot joint lies between the atlas and axis vertebrae in the neck; it allows rotation, turning the head from side to side.

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