Chapter 20: Locomotion and Movement – Case-Based / Source-Based Questions with Answers
CBSE Class 11 Biology Case-Based Questions – Locomotion and Movement (NCERT)
Course & Examination Details
- Course: CBSE Class 11 Biology
- Prescribed By: Central Board of Secondary Education
- Based On: NCERT
- Unit: Unit V – Human Physiology
- Chapter: Chapter 20 – Locomotion and Movement
- Question Type: Case-Based / Source-Based Questions
- Exam Relevance: CBSE Class 11 Annual Examination, Unit Tests, Competency-Based Assessments
Section A: Skeletal System (Case 1–9)
Case 1
A student observes that blinking of eyes does not change the body’s location.
Q1. What type of movement is this?
Answer:
It is movement but not locomotion, as there is no change in the position of the entire body.
Case 2
Walking involves coordinated action of bones and muscles.
Q2. Name the systems responsible for walking.
Answer:
The skeletal, muscular, and nervous systems work together to bring about walking.
Case 3
An X-ray shows 206 bones in an adult human body.
Q3. Name the two main divisions of the human skeleton.
Answer:
The human skeleton is divided into axial and appendicular skeleton.
Case 4
A skull injury damages facial bones.
Q4. How many facial bones are present in the human skull?
Answer:
There are 14 facial bones in the human skull.
Case 5
A patient with spinal injury experiences difficulty in movement.
Q5. Which structure of axial skeleton is injured?
Answer:
The vertebral column is injured.
Case 6
A diagram shows ribs attached to sternum.
Q6. State one function of the rib cage.
Answer:
The rib cage protects vital organs like the heart and lungs.
Case 7
Upper limbs are attached to the axial skeleton through a girdle.
Q7. Name this girdle.
Answer:
The pectoral girdle attaches upper limbs to the axial skeleton.
Case 8
Lower limbs support the entire body weight.
Q8. Which girdle is responsible for this function?
Answer:
The pelvic girdle supports body weight.
Case 9
Two bones meet at a point allowing smooth movement.
Q9. What is such a junction called?
Answer:
It is called a joint.
Section B: Joints & Skeletal Disorders (Case 10–15)
Case 10
A joint allows movement in all directions.
Q10. Identify the type of joint.
Answer:
It is a ball and socket joint.
Case 11
Elbow allows movement only in one plane.
Q11. Name the joint present at the elbow.
Answer:
The elbow has a hinge joint.
Case 12
Rotation of head occurs between first two vertebrae.
Q12. Name the joint involved.
Answer:
The pivot joint is involved between atlas and axis.
Case 13
Synovial fluid is present in certain joints.
Q13. State one function of synovial fluid.
Answer:
Synovial fluid reduces friction and allows smooth movement.
Case 14
An elderly person suffers frequent bone fractures.
Q14. Name the disorder responsible.
Answer:
Osteoporosis is responsible for frequent fractures.
Case 15
Joint inflammation causes pain and stiffness.
Q15. Identify this condition.
Answer:
The condition is called arthritis.
Section C: Muscular System (Case 16–20)
Case 16
A muscle attached to bone shows striations.
Q16. Name the type of muscle.
Answer:
It is a skeletal muscle.
Case 17
Muscles of intestine work without conscious control.
Q17. Identify the type of muscle present.
Answer:
Smooth muscles are present in the intestine.
Case 18
Heart muscles show rhythmic contraction.
Q18. Name the muscle type found in heart.
Answer:
Cardiac muscles are found in the heart.
Case 19
Microscopic view shows alternating dark and light bands.
Q19. What causes this appearance?
Answer:
Alternating A-bands and I-bands cause striations.
Case 20
A muscle fibre contains repeating functional units.
Q20. Name this functional unit.
Answer:
The sarcomere is the functional unit.
Section D: Muscle Contraction (Case 21–25)
Case 21
A student learns that actin slides over myosin during contraction.
Q21. Name the theory explaining this process.
Answer:
The sliding filament theory explains muscle contraction.
Case 22
Calcium ions are released from sarcoplasmic reticulum.
Q22. What is the role of calcium ions?
Answer:
Calcium ions expose binding sites on actin filaments.
Case 23
ATP is absent in a muscle after death.
Q23. Name the resulting condition.
Answer:
The condition is called rigor mortis.
Case 24
Biceps contract while triceps relax during arm bending.
Q24. What type of muscle arrangement is this?
Answer:
It is an antagonistic muscle arrangement.
Case 25
A patient experiences muscle weakness due to autoimmune disorder.
Q25. Identify the disorder.
Answer:
The disorder is myasthenia gravis.
NCERT & CBSE Compliance Note
✔ Strictly based on NCERT Class 11 Biology
✔ Competency-based and application-oriented
✔ Fully aligned with CBSE assessment pattern
✔ Ideal for board exams and internal assessments