Q.199 Zoology ⭐ 360° Option Elimination Active

NEET 2023 Zoology Question 199 Solution

Topic: Locomotion and Movement · Official NTA Booklet Code G5

Question

Which of the following statements are correct regarding skeletal muscle? A. Muscle bundles are held together by collagenous connective tissue layer called fascicle. B. Sarcoplasmic reticulum of muscle fibre is a store house of calcium ions. C. Striated appearance of skeletal muscle fibre is due to distribution pattern of actin and myosin proteins. D. M line is considered as functional unit of contraction called sarcomere. Choose the most appropriate answer from the options given below:

(1)C and D only
(2)A, B and C only
(3)B and C only
(4)A, C and D only

✓

Verified Against NTA Final Answer Key

Option (3) : B and C only

📚 Locomotion and Movement Medium

📋 Given Parameters & Problem Setup

Tissue Skeletal muscle fibre

Statements 4 statements (A-D) on fascia/fascicle, sarcoplasmic reticulum, striations, and sarcomere

⚡

The 30-Second Exam Hall Shortcut: ⚡ Fascicle vs. Fascia & Z-line vs. M-line Precision Filter

⏱️ Save ~25 seconds

Muscle bundles (fascicles) are held by connective tissue called FASCIA (not fascicle, so A is false!). The functional unit of contraction (sarcomere) is between two Z LINES (not M line, so D is false!). Statements B (SR is Ca2+ store) and C (striations due to actin/myosin) are TRUE! Match Option (3) B and C only!

1 Statement A: Muscle bundles held by connective tissue layer called fascicle -> False (Bundles ARE fascicles; the connective tissue sheath is FASCIA).

2 Statement B: Sarcoplasmic reticulum is a storehouse of Ca2+ ions -> True.

3 Statement C: Striated appearance is due to distribution pattern of actin and myosin -> True.

4 Statement D: M line is functional unit called sarcomere -> False (Sarcomere is the portion between two successive Z LINES).

5 B and C only -> Select Option (3).

🛡️

Why You Can 100% Trust This Shortcut: Canonical NCERT Locomotion and Movement muscle ultrastructure definitions.

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Evaluation of Statements B and C (Valid Statements)

Analyzing skeletal muscle ultrastructure according to NCERT: - Statement B: The sarcoplasmic reticulum ( $SR$ ) is a specialized endoplasmic reticulum network whose terminal cisternae sequester and release $Ca^{2+}$ upon depolarization. (Statement B is TRUE) - Statement C: Myofibrils exhibit alternating isotropic (I) bands and anisotropic (A) bands arising from the parallel interdigitating arrangement of thin actin and thick myosin myofilaments. (Statement C is TRUE)

\begin{aligned} \text{\textbf{Statement B:}} & \quad \text{Sarcoplasmic Reticulum} \equiv \mathbf{\text{Storehouse of }} Ca^{2+} \implies \mathbf{\text{TRUE}} \\[4pt] \text{\textbf{Statement C:}} & \quad \text{Striations} \equiv \mathbf{\text{Distribution of Actin and Myosin}} \implies \mathbf{\text{TRUE}} \end{aligned}

Step 2

Evaluation of Statements A and D (Invalid Statements)

Analyzing the anatomical errors planted in A and D: - Statement A: Each muscle consists of muscle bundles called fascicles. The collagenous connective tissue layer holding these fascicles together is called fascia. Statement A mistakenly calls the connective tissue layer "fascicle". - Statement D: The functional contractile unit of a myofibril is the sarcomere, defined as the portion between two successive Z-lines, NOT the M-line (the M-line is simply a thin fibrous membrane holding thick filaments in the middle of the A-band).

\begin{aligned} \text{\textbf{Statement A:}} & \quad \text{Connective tissue sheath} = \mathbf{\text{Fascia}} \quad (\neq \text{Fascicle}) \implies \mathbf{\text{FALSE}} \\[4pt] \text{\textbf{Statement D:}} & \quad \text{Sarcomere} = \mathbf{\text{Between two successive Z-lines}} \quad (\neq \text{M-line}) \implies \mathbf{\text{FALSE}} \end{aligned}

Step 3

Conclusion

Statements B and C are correct, while A and D are false. Option (3) is the required answer.

⭐

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:

Includes false statement D (sarcomere is bounded by Z-lines, not M-line).

⚠️

Student Fallacy (Why candidates pick this trap): Confusing the central M-line with the boundary Z-lines.

2 2

✗ Incorrect

Verdict & Scientific Reason:

Includes false statement A (connective tissue sheath is fascia, not fascicle).

⚠️

Student Fallacy (Why candidates pick this trap): Confusing the term fascicle (the bundle) with fascia (the connective tissue sheath).

3 3

✓ 100% Correct

Verdict & Scientific Reason:

Both Statements B (SR is Ca2+ storehouse) and C (striations due to actin and myosin) are verbatim NCERT truths.

💡

Why this is airtight: None; rigorous ultrastructural precision.

4 4

✗ Incorrect

Verdict & Scientific Reason:

Includes false statements A and D.

⚠️

Student Fallacy (Why candidates pick this trap): Accepting the erroneous fascia and M-line substitutions.

⚠️

NTA Trap Alert: Fascicle vs. Fascia Wording Trap

NTA intentionally substituted "fascicle" in place of "fascia" in Statement A. The muscle bundle IS the fascicle; the connective tissue wrapper is the FASCIA.

🛡️ How to avoid the -1 mark: Muscle bundle = Fascicle. Collagenous connective tissue wrapper = Fascia. Sarcomere = Between two Z-lines.

📖

Core NEET Syllabus Standard

NCERT Biology · Locomotion and Movement Standard Benchmark

Core Scientific Principle Tested:

"Sarcoplasmic reticulum is a store house of calcium ions. Striated appearance is due to actin and myosin distribution. Fascicles are held by fascia; Sarcomere is between two Z-lines."

Syllabus Focus: Structure of Contractile Proteins & Muscle Contraction

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2023 Zoology Question 199 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Fascicle vs. Fascia & Z-line vs. M-line Precision Filter

Step-by-Step Rigorous Workflow & Mathematical Proof

Evaluation of Statements B and C (Valid Statements)

Evaluation of Statements A and D (Invalid Statements)

Conclusion

360° Option Elimination Engine Key Feature

NTA Trap Alert: Fascicle vs. Fascia Wording Trap

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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