Chapter 20: Locomotion & Movement
NCERT Solutions for CBSE Class 10 Biology — 18 solved questions with detailed explanations.
Solved Questions
Q1. The sarcomere is the unit between two successive:
- Z lines
- M lines
- A bands
- H zones
Difficulty: Easy · Topic: Sarcomere
Solution
Sarcomere = functional unit of striated muscle, extending from one Z-line to the next Z-line.
Q2. Actin is a:
- nerve protein
- thick filament protein
- structural protein of bone
- thin filament protein
Difficulty: Easy · Topic: Locomotion & Movement
Solution
thin filament protein.
Q3. Myosin is a:
- thick filament protein
- nerve protein
- thin filament protein
- bone protein
Difficulty: Easy · Topic: Locomotion & Movement
Solution
thick filament protein.
Q4. Osteoporosis is:
- increased bone density
- bone cancer
- decreased bone density
- bone infection
Difficulty: Easy · Topic: Locomotion & Movement
Solution
decreased bone density.
Q5. H-zone contains:
- only thin filaments
- neither
- only thick filaments (myosin)
- both
Difficulty: Easy · Topic: Locomotion & Movement
Solution
only thick filaments (myosin).
Q6. I-band contains:
- only thin filaments (actin)
- both
- only thick filaments
- neither
Difficulty: Easy · Topic: Locomotion & Movement
Solution
only thin filaments (actin).
Q7. A-band contains:
- neither
- only thick
- only thin
- both thin and thick filaments
Difficulty: Easy · Topic: Locomotion & Movement
Solution
both thin and thick filaments.
Q8. During contraction, I-band:
- decreases in width
- increases
- stays same
- disappears completely
Difficulty: Easy · Topic: Locomotion & Movement
Solution
decreases in width.
Q9. During contraction, A-band:
- decreases
- remains same width
- increases
- disappears
Difficulty: Easy · Topic: Locomotion & Movement
Solution
remains same width.
Q10. During contraction, H-zone:
- decreases or disappears
- widens
- increases
- stays same
Difficulty: Easy · Topic: Locomotion & Movement
Solution
decreases or disappears.
Q11. ATP is needed for:
- nothing
- actin binding only
- cross-bridge cycling (myosin head movement)
- relaxation only
Difficulty: Easy · Topic: Locomotion & Movement
Solution
cross-bridge cycling (myosin head movement).
Q12. Rigor mortis occurs because:
- calcium excess
- no reason
- ATP depletion prevents myosin detachment
- ATP excess
Difficulty: Easy · Topic: Locomotion & Movement
Solution
ATP depletion prevents myosin detachment.
Q13. Synovial joints have:
- no cavity
- cartilage only
- fluid-filled cavity for lubrication
- bone fusion
Difficulty: Easy · Topic: Locomotion & Movement
Solution
fluid-filled cavity for lubrication.
Q14. Gout is caused by:
- protein deficiency
- vitamin D deficiency
- uric acid crystal deposition in joints
- calcium deficiency
Difficulty: Easy · Topic: Locomotion & Movement
Solution
uric acid crystal deposition in joints.
Q15. The sliding filament theory of muscle contraction was proposed by:
- Huxley and Hanson
- Watson and Crick
- Sutherland
- Hodgkin and Huxley
Difficulty: Easy-Medium · Topic: Muscle Contraction
Solution
H.E. Huxley and J. Hanson proposed the sliding filament theory of muscle contraction (1954).
Q16. Calcium ions in muscle contraction:
- bind to myosin
- bind to troponin C
- inhibit contraction
- activate ATPase directly
Difficulty: Easy-Medium · Topic: Locomotion & Movement
Solution
bind to troponin C.
Q17. Ball and socket joint is found in:
- shoulder and hip
- knee
- wrist
- elbow
Difficulty: Easy-Medium · Topic: Locomotion & Movement
Solution
shoulder and hip.
Q18. Hinge joint is found in:
- hip
- shoulder
- vertebral column
- knee and elbow
Difficulty: Easy-Medium · Topic: Locomotion & Movement
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