Class 9 Skeletal System Mock Test (ICSE)

Topics in Skeletal System

• Bones and their functions
• Classification of joints
• Types of joint movements in physical activity
• Benefits of exercise on the skeletal system

Skeletal System practice questions with answers

1. Q1Multiple choice·1 mark
   Which bone in the human body primarily serves the function of protecting the delicate organs of the central nervous system within the head?

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

   1. Correct option: (b) Cranium. The cranium forms a rigid, protective bony case specifically designed to safeguard the brain.+1

   Answer: (b)
2. Q2Multiple choice·1 mark
   Which of the following is a direct benefit of regular physical exercise on the skeletal system?

   1. (a)Increase in bone length after the growth plates have closed
   2. (b)Hardening of joint cartilage into a stronger bony layer
   3. (c)Increase in bone mineral density and strength
   4. (d)Fusion of movable joints to give a more stable skeleton
   Show answer and step marks

   1. Correct option: (c) Increase in bone mineral density and strength. Regular exercise applies mechanical stress on bones, stimulating osteoblast activity which leads to an increase in bone mineral density and overall skeletal strength.+1

   Answer: (c)
3. Q3Multiple choice·1 mark
   Which type of joint movement describes the decreasing of the angle between two articulating bones?

   1. (a)Flexion
   2. (b)Abduction
   3. (c)Rotation
   4. (d)Extension
   Show answer and step marks

   1. Correct option: (a) Flexion. Flexion is the angular movement that decreases the angle between bones, bringing them closer together.+1

   Answer: (a)
4. Q4Multiple choice·1 mark
   The hip joint is a classic example of which type of freely movable synovial joint?

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

   1. Correct option: (d) Ball and socket joint. The hip joint allows movement in multiple planes (flexion, extension, abduction, adduction, rotation) and is classified as a ball and socket joint.+1

   Answer: (d)
5. Q5Short answer·2 marks
   State any two ways in which regular physical exercise improves the health, efficiency, and strength of joints.
   Show answer and step marks

   1. First way, any one of: it increases the secretion of synovial fluid, which lubricates the joint and reduces friction; it strengthens the ligaments and tendons around the joint, giving stability and fewer injuries; it increases the range of movement and flexibility of the joint; it keeps the joint cartilage healthy and well nourished, reducing wear; it strengthens the muscles around the joint, which support it; or any other valid way.+1
   2. Second way, a different one from the same list.+1

   Answer: Any two of: more synovial fluid for lubrication; stronger ligaments and tendons for stability; greater range of movement and flexibility; healthier joint cartilage; stronger muscles supporting the joint.
6. Q6Long answer·4 marks
   The human skeletal system performs several vital mechanical and physiological functions essential for movement and survival. Explain any four primary functions of bones in the human body, providing a relevant example for each.
   Show answer and step marks

   1. First function with example, any one of: support, giving a rigid framework that holds up the body (e.g. the vertebral column supports the head and trunk); protection of delicate organs (e.g. the cranium protects the brain, the ribcage protects the heart and lungs); movement, with bones acting as levers for muscles (e.g. the femur and tibia in walking and running); formation of blood cells in the red bone marrow (e.g. in the sternum, ribs and ends of the femur); storage of minerals such as calcium and phosphorus (e.g. in long bones); giving shape to the body (e.g. the skull shapes the face); or any other valid function with a suitable example.+1
   2. Second function with example, a different one from the same list.+1
   3. Third function with example, a different one from the same list.+1
   4. Fourth function with example, a different one from the same list.+1

   Answer: Any four of: support (vertebral column); protection (cranium for the brain, ribcage for the heart and lungs); movement as levers for muscles (femur and tibia); blood cell formation in red marrow (sternum, ribs); mineral storage of calcium and phosphorus; giving shape to the body (skull).

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