Q.153 Zoology ⭐ 360° Option Elimination Active

NEET 2023 Zoology Question 153 Solution

Topic: Body Fluids and Circulation · Official NTA Booklet Code G5

Question

Match List I with List II. List I: A. P-wave; B. Q-wave; C. QRS complex; D. T-wave. List II: I. Beginning of systole; II. Repolarisation of ventricles; III. Depolarisation of atria; IV. Depolarisation of ventricles. Choose the correct answer from the options given below:

✓

Verified Against NTA Final Answer Key

Option (2) : A-III, B-I, C-IV, D-II

📚 Body Fluids and Circulation Easy

📋 Given Parameters & Problem Setup

ECG Waves P-wave, Q-wave, QRS complex, T-wave

Cardiac Cycle Events Depolarisation of atria, Beginning of systole, Depolarisation of ventricles, Repolarisation of ventricles

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The 30-Second Exam Hall Shortcut: ⚡ Standard ECG Wave Decoder

⏱️ Save ~25 seconds

Match standard ECG waves: P = Atrial depolarisation (III); QRS = Ventricular depolarisation (IV); T = Ventricular repolarisation (II); Q-wave = Marks beginning of ventricular systole (I)! Match Option (2)!

1 P-wave: Electrical excitation / depolarisation of atria -> A-III.

2 QRS complex: Depolarisation of ventricles (initiates ventricular contraction) -> C-IV.

3 Q-wave: Marks the beginning of the ventricular systole -> B-I.

4 T-wave: Repolarisation of ventricles (return to resting state) -> D-II.

5 Match combination: A-III, B-I, C-IV, D-II -> Option (2).

🛡️

Why You Can 100% Trust This Shortcut: Canonical NCERT Human Physiology electrocardiography electrophysiological waves.

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Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Electrophysiological Basis of ECG Waves

A standard electrocardiogram represents the sequential propagation of action potentials across cardiac chambers:

\begin{aligned} \text{\textbf{A. P-wave:}} & \quad \text{Depolarisation of the atria (leads to atrial contraction)} \implies \mathbf{\text{III}} \\[4pt] \text{\textbf{B. Q-wave:}} & \quad \text{Marks the beginning of ventricular systole} \implies \mathbf{\text{I}} \\[4pt] \text{\textbf{C. QRS complex:}} & \quad \text{Depolarisation of the ventricles (initiates ventricular systole)} \implies \mathbf{\text{IV}} \\[4pt] \text{\textbf{D. T-wave:}} & \quad \text{Repolarisation of the ventricles (end of ventricular systole)} \implies \mathbf{\text{II}} \end{aligned}

Step 2

Verbatim NCERT Reference

NCERT states under Electrocardiograph (ECG): - "The P-wave represents the electrical excitation (or depolarisation) of the atria..." - "The QRS complex represents the depolarisation of the ventricles..." - "The contraction starts shortly after Q and marks the beginning of the systole." - "The T-wave represents the return of the ventricles from excited to normal state (repolarisation)."

Step 3

Option Elimination

Matching A-III immediately isolates Option (2), making this solvable within seconds.

⭐

360° Option Elimination Engine Key Feature

Diagnose every choice: Know exactly why the right option works and why distractors fail.

4-Option Deep Scan

1 1

✗ Incorrect

Verdict & Scientific Reason:

Mismatches P-wave with beginning of systole.

⚠️

Student Fallacy (Why candidates pick this trap): Confusing atrial electrical activity with mechanical systole.

2 2

✓ 100% Correct

Verdict & Scientific Reason:

Flawless 1-to-1 match with the canonical NCERT electrocardiography definitions.

💡

Why this is airtight: None; textbook verbatim match.

3 3

✗ Incorrect

Verdict & Scientific Reason:

Mismatches P-wave with ventricular depolarisation.

⚠️

Student Fallacy (Why candidates pick this trap): Inverting atrial and ventricular waves.

4 4

✗ Incorrect

Verdict & Scientific Reason:

Mismatches P-wave with repolarisation.

⚠️

Student Fallacy (Why candidates pick this trap): Confusing depolarisation with repolarisation.

⚠️

NTA Trap Alert: Q-wave vs. QRS Complex Clinical Trap

Students often overlook the specific isolated role of the Q-wave: while the entire QRS complex represents ventricular depolarisation, the Q-wave specifically marks the onset/beginning of ventricular systole.

🛡️ How to avoid the -1 mark: Remember: QRS = Ventricular depolarisation. Q-wave alone = Beginning of systole.

📖

Core NEET Syllabus Standard

NCERT Biology · Body Fluids and Circulation Standard Benchmark

Core Scientific Principle Tested:

"P-wave is atrial depolarisation; Q-wave marks the beginning of systole; QRS complex is ventricular depolarisation; T-wave is ventricular repolarisation."

Syllabus Focus: Electrocardiograph (ECG)

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2023 Zoology Question 153 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Standard ECG Wave Decoder

Step-by-Step Rigorous Workflow & Mathematical Proof

Electrophysiological Basis of ECG Waves

Verbatim NCERT Reference

Option Elimination

360° Option Elimination Engine Key Feature

NTA Trap Alert: Q-wave vs. QRS Complex Clinical Trap

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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