Locomotion and Movement
ICSE · Class 11 · Biology
Most important questions from Locomotion and Movement for ICSE Class 11 Biology board exam 2026. MCQs, short answer, and long answer questions with marks.
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What type of joint is found at the shoulder?
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d
The shoulder joint is a ball-and-socket (multiaxial) joint allowing movement in all directions. The hip joint is also a ball-and-socket joint. Therefore, the correct answer is option (4) Ball-and-socket joint.
What is the role of calcium ions (Ca²⁺) in muscle contraction?
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b
Ca²⁺ released from sarcoplasmic reticulum binds to troponin C, causing the troponin-tropomyosin complex to shift and expose the myosin-binding sites on actin filaments. Therefore, the correct answer is option (2) Bind to troponin to expose actin binding sites.
Which of the following is a hinge joint?
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d
The elbow joint is a hinge joint that allows only flexion and extension (uniaxial movement). The knee is also a hinge joint. Therefore, the correct answer is option (4) Elbow joint.
What is rigor mortis?
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Sustained muscle contraction after death due to absence of ATP
Rigor mortis is stiffening of muscles after death. Without ATP, myosin heads cannot detach from actin → muscles become rigid. Begins 3–6 hours after death. Therefore, the correct answer is option (2) Sustained muscle contraction after death due to absence of ATP.
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