Q.161 Zoology ⭐ 360° Option Elimination Active

NEET 2024 Zoology Question 161 Solution

Topic: Structural Organisation in Animals · Official NTA Booklet Code T1

Question

Three types of muscles are given as a, b and c. Identify the correct matching pair along with their location in human body: (a) (b) (c) Name of muscle/location

(1)(a) Skeletal - Biceps (b) Involuntary - Intestine (c) Smooth - Heart.
(2)(a) Involuntary - Nose tip (b) Skeletal - Bone (c) Cardiac - Heart.
(3)(a) Smooth - Toes (b) Skeletal - Legs (c) Cardiac - Heart.
(4)(a) Skeletal - Triceps (b) Smooth - Stomach (c) Cardiac - Heart.

✓

Verified Against NTA Final Answer Key

Option (4) : (a) Skeletal - Triceps; (b) Smooth - Stomach; (c) Cardiac - Heart.

📚 Structural Organisation in Animals Easy

📋 Given Parameters & Problem Setup

Diagram (a) Striated, cylindrical, unbranched fibers with multinucleated peripheral nuclei

Diagram (b) Fusiform, non-striated, single central nucleus

Diagram (c) Striated, branched fibers with intercalated discs

⚡

The 30-Second Exam Hall Shortcut: ⚡ Muscle Histology Visual Signatures

⏱️ Save ~20 seconds

Diagram (a) = Skeletal (striated, unbranched -> Triceps); Diagram (b) = Smooth (spindle-shaped, involuntary -> Stomach); Diagram (c) = Cardiac (branched with intercalated discs -> Heart)!

1 Examine Diagram (a): Parallel cylindrical fibers showing distinct dark/light striations -> Skeletal muscle (e.g., biceps, triceps).

2 Examine Diagram (b): Fusiform / spindle-shaped fibers tapering at both ends, lack striations -> Smooth muscle (visceral organs, e.g., stomach, intestine).

3 Examine Diagram (c): Branched striated fibers with intercalated discs -> Cardiac muscle (heart).

4 Option (4) states: (a) Skeletal - Triceps; (b) Smooth - Stomach; (c) Cardiac - Heart.

5 Select Option (4) / D.

🛡️

Why You Can 100% Trust This Shortcut: NCERT Biology · Structural Organisation in Animals (Muscle Tissue)

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Identify Diagram (a) (Skeletal Muscle)

Skeletal muscle tissue is closely attached to skeletal bones. Striated muscle fibers are bundled together in a parallel fashion with multiple peripheral nuclei. Triceps and biceps are classic examples.

Step 2

Identify Diagram (b) (Smooth Muscle)

Smooth muscle fibers taper at both ends (fusiform) and do not show striations. Cell junctions hold them together and they are bundled in a connective tissue sheath. The wall of internal organs such as blood vessels, stomach and intestine contains this type of muscle tissue.

Step 3

Identify Diagram (c) (Cardiac Muscle)

Cardiac muscle tissue is a contractile tissue present only in the heart. Cell junctions fuse the plasma membranes of cardiac muscle cells and make them stick together. Communication junctions (intercalated discs) at some fusion points allow the cells to contract as a unit.

⭐

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:

Misidentifies cardiac muscle (c) as smooth muscle.

⚠️

Student Fallacy (Why candidates pick this trap): Misidentifies cardiac muscle (c) as smooth muscle.

2 (2)

✗ Incorrect

Verdict & Scientific Reason:

Skeletal muscles are voluntary; nose tip contains cartilage, not muscle.

⚠️

Student Fallacy (Why candidates pick this trap): Skeletal muscles are voluntary; nose tip contains cartilage, not muscle.

3 (3)

✗ Incorrect

Verdict & Scientific Reason:

Inverts skeletal (a) and smooth (b).

⚠️

Student Fallacy (Why candidates pick this trap): Inverts skeletal (a) and smooth (b).

4 (4)

✓ 100% Correct

Verdict & Scientific Reason:

Correctly identifies the histological morphology and physiological anatomical location for all three muscle types.

💡

Why this is airtight: None.

⚠️

NTA Trap Alert: Intercalated Disc Identification

Confusing cardiac muscle branching with skeletal muscle fibers.

🛡️ How to avoid the -1 mark: Look for dark transverse bands (intercalated discs) and branching patterns unique to cardiac muscle.

📖

Core NEET Syllabus Standard

Biology Core Zoology · Structural Organisation in Animals Standard Benchmark

Core Scientific Principle Tested:

"Skeletal muscle tissue is closely attached to skeletal bones... Smooth muscle fibres taper at both ends and do not show striations. Cardiac muscle tissue is a contractile tissue present only in the heart. Communication junctions (intercalated discs) allow cells to contract as a unit."

Syllabus Focus: Classification of Muscle Tissues: Skeletal, Smooth, and Cardiac

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2024 Zoology Question 161 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Muscle Histology Visual Signatures

Step-by-Step Rigorous Workflow & Mathematical Proof

Identify Diagram (a) (Skeletal Muscle)

Identify Diagram (b) (Smooth Muscle)

Identify Diagram (c) (Cardiac Muscle)

360° Option Elimination Engine Key Feature

NTA Trap Alert: Intercalated Disc Identification

Core NEET Syllabus Standard

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