Match List-I with List-II List-I (ECG) (A) P-wave (B) QRS complex (C) T wave (D) End of T wave List-II (Electrical activity of heart) (I) Depolarisation of ventricles (II) End of systole (III) Depolarisation of atria (IV) Repolarisation of ventricles Choose the correct answer from the options given below :
Answer: (B) (A)-(III), (B)-(I), (C)-(IV), (D)-(II). Answer: (b) (A)-(III), (B)-(I), (C)-(IV), (D)-(II) Solution: The P-wave is depolarisation of the atria (III); the QRS complex is depolarisation of the ventricles (I); the T-wave is repolarisation of the ventricles (IV); and the end of the T-wave marks the end of systole (II).
- A.(A)-(IV), (B)-(III), (C)-(I), (D)-(II)
- B.(A)-(III), (B)-(I), (C)-(IV), (D)-(II)✓
- C.(A)-(IV), (B)-(I), (C)-(III), (D)-(II)
- D.(A)-(I), (B)-(IV), (C)-(III), (D)-(II)
Correct Answer
(B) (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
Solution & Explanation
Answer: (b) (A)-(III), (B)-(I), (C)-(IV), (D)-(II) Solution: The P-wave is depolarisation of the atria (III); the QRS complex is depolarisation of the ventricles (I); the T-wave is repolarisation of the ventricles (IV); and the end of the T-wave marks the end of systole (II). This matches A-III, B-I, C-IV, D-II. NCERT: Ch 15, p.201, line 19 — "The T-wave represents the return of the ventricles... (repolarisation). The end of the T-wave marks the end of systole."