Q.84 Zoology ⭐ 360° Option Elimination Active

NEET 2020 Zoology Question 84 Solution

Topic: Locomotion and Movement · Official NTA Booklet Code E1

Question

Match the following columns and select the correct option. Column - I Column - II (a) Floating Ribs (i) Located between second and seventh ribs (b) Acromion (ii) Head of the Humerus (c) Scapula (iii) Clavicle (d) Glenoid cavity (iv) Do not connect with the sternum (a) (b) (c) (d)

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

✓

Verified Against NTA Final Answer Key

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

📚 Locomotion and Movement Easy

📋 Given Parameters & Problem Setup

Column I (Skeletal Elements) (a) Floating Ribs, (b) Acromion, (c) Scapula, (d) Glenoid cavity

Column II (Anatomical Relations) (i) Located between second and seventh ribs, (ii) Head of the Humerus, (iii) Clavicle, (iv) Do not connect with the sternum

⚡

The 30-Second Exam Hall Shortcut: ⚡ "Floating = No Sternum; Acromion = Clavicle; Scapula = 2nd-7th Ribs; Glenoid = Humerus!"

⏱️ 25 seconds

Floating ribs (11th and 12th pairs) do not connect ventrally with the sternum (a->iv). Acromion process articulates with the clavicle (b->iii). Scapula is a large triangular bone situated between 2nd and 7th ribs (c->i). Glenoid cavity articulates with the head of the humerus (d->ii). Combination is (iv), (iii), (i), (ii) -> Option 4 in 10 seconds!

1 Floating ribs (11th & 12th pairs) are not connected ventrally to sternum -> (a)-(iv).

2 Acromion process of scapula articulates with the clavicle (collar bone) -> (b)-(iii).

3 Scapula is situated in dorsal part of thorax between 2nd and 7th ribs -> (c)-(i).

4 Glenoid cavity articulates with head of the humerus forming the ball-and-socket shoulder joint -> (d)-(ii).

5 Mapping: (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii) -> Option 4.

🛡️

Why You Can 100% Trust This Shortcut: NCERT Biology · Human Physiology: Locomotion and Movement (Skeletal System: Ribs & Pectoral Girdle)

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Match Floating Ribs

The last 2 pairs of ribs (11th and 12th) are not connected ventrally to the sternum and are therefore called floating ribs. Thus, (a) matches (iv).

Step 2

Match Acromion

The dorsal, flat, triangular body of the scapula has a slightly elevated ridge called the spine which projects as a flat, expanded process called the acromion. The clavicle articulates with this acromion process. Thus, (b) matches (iii).

Step 3

Match Scapula

Scapula is a large triangular flat bone situated in the dorsal part of the thorax between the second and the seventh ribs. Thus, (c) matches (i).

Step 4

Match Glenoid Cavity

Below the acromion is a shallow depression called the glenoid cavity which articulates with the head of the humerus to form the shoulder joint. Thus, (d) matches (ii).

⭐

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 A

✗ Incorrect

Verdict & Scientific Reason:

Incorrect; pairs floating ribs with head of humerus and acromion with sternum disconnection.

⚠️

Student Fallacy (Why candidates pick this trap): Anatomical misalignment.

2 B

✗ Incorrect

Verdict & Scientific Reason:

Incorrect; places floating ribs between second and seventh ribs.

⚠️

Student Fallacy (Why candidates pick this trap): Confusing rib cage boundary markers with floating ribs.

3 C

✗ Incorrect

Verdict & Scientific Reason:

Incorrect; attributes clavicle articulation to floating ribs.

⚠️

Student Fallacy (Why candidates pick this trap): Arbitrary matching.

4 D

✓ 100% Correct

Verdict & Scientific Reason:

Accurate pairing across all four skeletal structures of the human thorax and pectoral girdle.

💡

Why this is airtight: None; textbook osteology definitions.

⚠️

NTA Trap Alert: Scapula Rib Landmarks

Scapula lies dorsally between the 2nd and 7th ribs. Floating ribs are the 11th and 12th ribs (not connected to sternum).

🛡️ How to avoid the -1 mark: Remember: Scapula = 2nd to 7th ribs; Glenoid = Head of humerus; Acromion = Clavicle!

📖

Core NEET Syllabus Standard

Zoology · Locomotion and Movement Standard Benchmark

Core Scientific Principle Tested:

Syllabus Focus: Anatomy of Ribs and Pectoral Girdle: Floating Ribs, Acromion, Scapula & Glenoid Cavity

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2020 Zoology Question 84 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ "Floating = No Sternum; Acromion = Clavicle; Scapula = 2nd-7th Ribs; Glenoid = Humerus!"

Step-by-Step Rigorous Workflow & Mathematical Proof

Match Floating Ribs

Match Acromion

Match Scapula

Match Glenoid Cavity

360° Option Elimination Engine Key Feature

NTA Trap Alert: Scapula Rib Landmarks

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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