Match List I with List II:List I List II A. P-wave I. Beginning of systole B. Q-wave II. Repolarisation of ventricles C. QRS complex III. Depolarisation of atria D. T-wave IV. Depolarisation of ventricles
Choose the correct answer from the options given below:
| List I | List II |
|---|---|
| A. P-wave | I. Beginning of systole |
| B. Q-wave | II. Repolarisation of ventricles |
| C. QRS complex | III. Depolarisation of atria |
| D. T-wave | IV. Depolarisation of ventricles |
Answer: (A) A-III, B-I, C-IV, D-II. Answer: (a) A-III, B-I, C-IV, D-II Solution: P-wave is depolarisation (excitation) of the atria (III); the Q-wave marks the beginning of systole since contraction starts shortly after Q (I); the QRS complex represents depolarisation of the ventricles (IV); and the T-wave represents repolarisation of the ventricles (II).
- A.A-III, B-I, C-IV, D-II✓
- B.A-IV, B-III, C-II, D-I
- C.A-II, B-IV, C-I, D-III
- D.A-I, B-II, C-III, D-IV
Correct Answer
(A) A-III, B-I, C-IV, D-II
Solution & Explanation
Answer: (a) A-III, B-I, C-IV, D-II Solution: P-wave is depolarisation (excitation) of the atria (III); the Q-wave marks the beginning of systole since contraction starts shortly after Q (I); the QRS complex represents depolarisation of the ventricles (IV); and the T-wave represents repolarisation of the ventricles (II). This gives A-III, B-I, C-IV, D-II. NCERT: Ch 15, p.201, line 17 — "The contraction starts shortly after Q and marks the beginning of the systole."