Q.188 Zoology ⭐ 360° Option Elimination Active

NEET 2021 Zoology Question 188 Solution

Topic: Locomotion and Movement · Official NTA Booklet Code M1

Question

Match List - I with List - II. (a) Scapula (i) Cartilaginous joints (b) Cranium (ii) Flat bone (c) Sternum (iii) Fibrous joints (d) Vertebral column (iv) Triangular flat bone List - II List - I Choose the correct answer from the options given below. (a) (b) (c) (d)

(1)(i) (iii) (ii) (iv)
(2)(ii) (iii) (iv) (i)
(3)(iv) (ii) (iii) (i)
(4)(iv) (iii) (ii) (i)

✓

Verified Against NTA Final Answer Key

Option (4) : (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

📚 Locomotion and Movement Easy

📋 Given Parameters & Problem Setup

List I (Bones / Regions) (a) Scapula, (b) Cranium, (c) Sternum, (d) Vertebral column

List II (Characteristics / Joint Types) (i) Cartilaginous joints, (ii) Flat bone, (iii) Fibrous joints, (iv) Triangular flat bone

⚡

The 30-Second Exam Hall Shortcut: ⚡ "Scapula = Triangular Flat Bone, Cranium = Fibrous Sutures"

⏱️ Save ~25 seconds

Scapula is a large triangular flat bone situated on the dorsal thorax ((a)-(iv)), and cranial bones are united by immovable fibrous joints / sutures ((b)-(iii)). Looking at options, only Option (4) matches both (a)-(iv) and (b)-(iii)! Solved in 10 seconds.

1 Match (a) Scapula -> (iv) Triangular flat bone (pectoral girdle).

2 Match (b) Cranium -> (iii) Fibrous joints (dense fibrous connective tissue sutures).

3 Match (c) Sternum -> (ii) Flat bone (ventral midline of thorax).

4 Match (d) Vertebral column -> (i) Cartilaginous joints (intervertebral discs permitting limited movement).

5 Match pattern (iv), (iii), (ii), (i) -> Option (4).

🛡️

Why You Can 100% Trust This Shortcut: NCERT Biology · Locomotion and Movement (Skeletal System & Joints: Scapula is a large triangular flat bone; Cranium bones are fused by fibrous joints; Sternum is a flat bone on the ventral midline; Adjacent vertebrae in vertebral column are joined by cartilaginous joints).

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Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Morphological and Histological Characterization of Skeletal Elements

- (a) Scapula: A large, thin, triangular flat bone situated in the dorsal part of the thorax between the second and seventh ribs. It features a spine terminating in the acromion process. - (b) Cranium: Cranial bones are firmly knit together end-to-end by dense fibrous connective tissue in the form of sutures to form the brain box; these are classic fibrous joints that permit zero movement (synarthroses). - (c) Sternum: A dagger-shaped flat bone positioned along the ventral midline of the thorax, providing anterior anchorage for true ribs. - (d) Vertebral column: Adjacent vertebrae are articulated by intervertebral fibrocartilaginous discs, which constitute cartilaginous joints (amphiarthroses) permitting limited flexibility and shock absorption.

\begin{aligned} \text{Scapula} &\iff \text{Triangular flat bone} \quad [\text{(a)} \to \text{(iv)}] \\ \text{Cranium} &\iff \text{Fibrous joints} \quad [\text{(b)} \to \text{(iii)}] \\ \text{Sternum} &\iff \text{Flat bone} \quad [\text{(c)} \to \text{(ii)}] \\ \text{Vertebral column} &\iff \text{Cartilaginous joints} \quad [\text{(d)} \to \text{(i)}] \end{aligned}

Step 2

Option Alignment

Matching sequence is: (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i). This corresponds perfectly to Option (4).

⭐

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:

Incorrect. Links scapula to cartilaginous joints and vertebral column to triangular flat bone.

⚠️

Student Fallacy (Why candidates pick this trap): Swapping Scapula and Vertebral column.

2 2

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Assigns simple flat bone to scapula and triangular flat bone to sternum (sternum is not triangular).

⚠️

Student Fallacy (Why candidates pick this trap): Failing to remember the triangular contour of the scapula.

3 3

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Assigns flat bone to cranium and fibrous joints to sternum.

⚠️

Student Fallacy (Why candidates pick this trap): Misaligning cranial sutures.

4 4

✓ 100% Correct

Verdict & Scientific Reason:

Correct. Accurately links all bones and their joint/structural definitions.

💡

Why this is airtight: None. Candidate recalls precise textbook anatomical definitions.

⚠️

NTA Trap Alert: Scapula vs Sternum "Flat Bone" Discrimination Trap

Both scapula and sternum are flat bones. However, NCERT specifically qualifies the scapula as a "triangular flat bone" and sternum simply as a "flat bone on the ventral midline".

🛡️ How to avoid the -1 mark: Identify the shape adjective: "Triangular" belongs uniquely to the Scapula.

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Core NEET Syllabus Standard

NEET / NCERT Biology · Locomotion and Movement Standard Benchmark

Core Scientific Principle Tested:

"Scapula is a triangular flat bone; Cranium has fibrous joints; Sternum is a flat bone; Vertebral column has cartilaginous joints."

Syllabus Focus: Skeletal System and Joints

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2021 Zoology Question 188 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ "Scapula = Triangular Flat Bone, Cranium = Fibrous Sutures"

Step-by-Step Rigorous Workflow & Mathematical Proof

Morphological and Histological Characterization of Skeletal Elements

Option Alignment

360° Option Elimination Engine Key Feature

NTA Trap Alert: Scapula vs Sternum "Flat Bone" Discrimination Trap

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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