Locomotion and Movement Previous Year Questions — NEET Biology

3 past-year Locomotion and Movement questions from NEET (Biology).

Q158 (2024)

Match List I with List II related to muscular/skeletal system: <div style="overflow-x: auto; margin: 1rem 0;"><table style="width: 100%; border-collapse: collapse; text-align: left; font-size: 14px;"><thead><tr><th style="border: 1px solid #888; padding: 8px;">List I</th><th style="border: 1px solid #888; padding: 8px;">List II</th></tr></thead><tbody><tr><td style="border: 1px solid #888; padding: 8px;">(A) Tetany</td><td style="border: 1px solid #888; padding: 8px;">(I) Inflammation of joints</td></tr><tr><td style="border: 1px solid #888; padding: 8px;">(B) Arthritis</td><td style="border: 1px solid #888; padding: 8px;">(II) Autoimmune disorder affecting neuromuscular junction</td></tr><tr><td style="border: 1px solid #888; padding: 8px;">(C) Myasthenia gravis</td><td style="border: 1px solid #888; padding: 8px;">(III) Wild contraction in muscle due to low $Ca^{2+}$ in body fluid</td></tr><tr><td style="border: 1px solid #888; padding: 8px;">(D) Muscular dystrophy</td><td style="border: 1px solid #888; padding: 8px;">(IV) Progressive degeneration of skeletal muscle</td></tr></tbody></table></div> Choose the correct answer from the options given below:
  1. A-III, B-I, C-II, D-IV
  2. A-IV, B-III, C-II, D-I
  3. A-I, B-II, C-III, D-IV
  4. A-III, B-II, C-I, D-IV
### Related Formula $\begin{aligned} \text{Tetany} &\rightarrow \text{Rapid spasms / wild contractions due to low } Ca^{2+}\\ \text{Arthritis} &\rightarrow \text{Inflammation of joints}\\ \text{Myasthenia Gravis} &\rightarrow \text{Autoimmune disorder of neuromuscular junction}\\ \text{Muscular Dystrophy} &\rightarrow \text{Genetic progressive degeneration of skeletal muscle} \end{aligned}$ ### Core Logic Matching each disorder with its clinical description: * (A) Tetany $\rightarrow$ Wild contraction in muscle due to low $Ca^{2+}$ in body fluid (III) * (B) Arthritis $\rightarrow$ Inflammation of joints (I) * (C) Myasthenia gravis $\rightarrow$ Autoimmune disorder affecting neuromuscular junction (II) * (D) Muscular dystrophy $\rightarrow$ Progressive degeneration of skeletal muscle (IV) ### Step 1: Result The correct combination is A-III, B-I, C-II, D-IV. ### Pattern Recognition Sees: "Tetany Arthritis Myasthenia gravis Muscular dystrophy". Shortcut: Arthritis = Inflammation of joints (B-I); Tetany = low calcium spasms (A-III). ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Biology: Locomotion and Movement

Q168 (2024)

Which of the following statements are correct with reference to human endoskeleton? A. Human skull is monocondylic. B. The joint between any two adjoining vertebrae is a cartilaginous joint. C. In human beings, the number of cervical vertebrae is seven. D. All ribs except the last 2 pairs are bicephalic. E. The occipital bone of skull is articulated with atlas vertebra. Choose the correct answer from the options given below:
  1. A, B and D only
  2. B and E only
  3. B, C and E only
  4. C, D and E only
### Related Formula $\text{Human Skull} = \text{Dicondylic (2 occipital condyles)}, \quad \text{Cervical Vertebrae} = 7, \quad \text{All 12 pairs of ribs} = \text{Bicephalic}$ ### Core Logic Evaluating endoskeleton statements: * A (Incorrect): Human skull is dicondylic (possesses two occipital condyles). * B (Correct): Adjacent vertebrae are joined by cartilaginous joints permitting limited movement. * C (Correct): Almost all mammals, including humans, have 7 cervical vertebrae. * D (Incorrect): ALL ribs in humans are bicephalic (have two articulation heads on dorsal end). * E (Correct): Occipital condyles of skull articulate with atlas vertebra (1st cervical vertebra). ### Step 1: Conclusion Statements B, C, and E are correct. ### Pattern Recognition Sees: "human skull monocondylic" (False, dicondylic). Shortcut: Eliminate options containing A or D. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Biology: Locomotion and Movement

Q173 (2024)

Choose the correct statements regarding muscle contraction. A. A motor neuron carries a signal sent by the Central Nervous System (CNS) to the sarcolemma of the muscle fibre. B. The neural signal generates an action potential which causes the release of $\mathrm{Ca}^{2+}$ into sarcoplasm. C. Increase in $\mathrm{Ca}^{2+}$ inactivates the actin for breaking cross bridges. D. Actin binds to the myosin head to form a cross bridge. E. Shortening of sarcomere takes place, by pulling actin filaments towards the centre of 'A' band. Choose the correct answer from the options given below:
  1. A, B, D and E only
  2. C and D only
  3. C and E only
  4. A and B only
### Related Formula $$\text{Increase in } Ca^{2+} \text{ level} \rightarrow \text{Binds to Troponin} \rightarrow \text{Unmasks active sites on Actin} \rightarrow \text{Cross-bridge formation}$$ ### Core Logic Evaluating statements regarding muscle contraction: * A (Correct): Motor neurons send signal from CNS to neuromuscular junction. * B (Correct): Action potential causes release of $Ca^{2+}$ from sarcoplasmic reticulum into sarcoplasm. * C (Incorrect): Increase in $Ca^{2+}$ binds to troponin to UNMASK active sites on actin (it activates actin for cross-bridge formation, not inactivates). * D (Correct): Myosin head binds to unmasked active site on actin forming a cross-bridge. * E (Correct): Actin filaments are pulled inward toward the center of 'A' band, causing shortening of sarcomere. ### Step 1: Conclusion Statements A, B, D, and E are correct. ### Pattern Recognition Sees: "Ca2+ inactivates actin" (False). Shortcut: Calcium unmasks active sites on actin $\rightarrow$ statement C is false. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Biology: Locomotion and Movement
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JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%) | JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%)

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