Q.47 Zoology ⭐ 360° Option Elimination Active

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NEET 2020 Zoology Question 47 Solution

Topic: Digestion and Absorption · Official NTA Booklet Code E1

Question

Identify the correct statement with reference to human digestive system.

(1)Ileum opens into small intestine.
(2)Serosa is the innermost layer of the alimentary canal.
(3)Ileum is a highly coiled part.
(4)Vermiform appendix arises from duodenum.

✓

Verified Against NTA Final Answer Key

Option (3) : Ileum is a highly coiled part.

📚 Digestion and Absorption Easy

📋 Given Parameters & Problem Setup

System Human Digestive System

Question Objective Identify the factually CORRECT anatomical statement

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The 30-Second Exam Hall Shortcut: ⚡ "Duodenum = C-shaped, Jejunum = Long coiled, Ileum = HIGHLY coiled!"

⏱️ 25 seconds

Duodenum is 'C' shaped, jejunum is a long coiled middle portion, and ileum is a HIGHLY coiled terminal section of the small intestine. Ileum opens into the large intestine (caecum), not small intestine. Serosa is outermost. Statement (3) is 100% correct!

1 Ileum opens into the caecum of large intestine (Statement 1 is false).

2 Serosa is outermost visceral layer; mucosa is innermost (Statement 2 is false).

3 Ileum is a highly coiled part (Statement 3 is TRUE).

4 Vermiform appendix arises from caecum, not duodenum (Statement 4 is false).

5 Mark Option (3) in 5 seconds.

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Why You Can 100% Trust This Shortcut: NCERT Biology · Human Physiology: Digestion and Absorption (Alimentary Canal)

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Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Evaluate Statement (1): Ileum Opening

Small intestine consists of three regions: 'C' shaped duodenum, long coiled middle portion jejunum, and highly coiled ileum. The ileum opens into the caecum of the LARGE intestine via the ileocaecal valve, not into the small intestine.

Step 2

Evaluate Statement (2): Alimentary Canal Layers

The wall of the alimentary canal from oesophagus to rectum possesses four layers: Serosa (outermost thin mesothelium), Muscularis, Submucosa, and Mucosa (innermost lining the lumen). Statement 2 erroneously claims serosa is innermost.

Step 3

Evaluate Statement (3): Ileum Morphology

NCERT states verbatim: "a 'C' shaped duodenum, a long coiled middle portion jejunum and a highly coiled ileum." Thus, statement (3) is completely accurate.

Step 4

Evaluate Statement (4): Vermiform Appendix Origin

The vermiform appendix is a narrow, finger-like tubular vestigial projection arising from the caecum (first part of large intestine), not from the duodenum.

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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:

False; ileum IS part of the small intestine and terminates by opening into the caecum of the large intestine.

⚠️

Student Fallacy (Why candidates pick this trap): Careless reading overlooking that ileum connects to the large intestine.

2 B

✗ Incorrect

Verdict & Scientific Reason:

False; serosa is the outermost layer composed of mesothelium; mucosa is the innermost layer.

⚠️

Student Fallacy (Why candidates pick this trap): Confusing anatomical orientation from inner lumen to outer wall.

3 C

✓ 100% Correct

Verdict & Scientific Reason:

Factually true; verbatim NCERT statement describing the terminal segment of the small intestine.

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Why this is airtight: None; textbook anatomical description.

4 D

✗ Incorrect

Verdict & Scientific Reason:

False; vermiform appendix arises from the blind sac caecum of the large intestine.

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Student Fallacy (Why candidates pick this trap): Mixing up upper intestinal duodenum with lower intestinal caecum.

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NTA Trap Alert: Gut Wall Histology: Outside to Inside

Outer to inner order: Serosa -> Muscularis -> Submucosa -> Mucosa -> Lumen. Never invert serosa and mucosa!

🛡️ How to avoid the -1 mark: Mnemonic for gut layers from outside in: "Some Men Smoke Much" (Serosa, Muscularis, Submucosa, Mucosa).

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Core NEET Syllabus Standard

Zoology · Digestion and Absorption Standard Benchmark

Core Scientific Principle Tested:

Syllabus Focus: Anatomy of Human Alimentary Canal: Small Intestine and Wall Layers

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2020 Zoology Question 47 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ "Duodenum = C-shaped, Jejunum = Long coiled, Ileum = HIGHLY coiled!"

Step-by-Step Rigorous Workflow & Mathematical Proof

Evaluate Statement (1): Ileum Opening

Evaluate Statement (2): Alimentary Canal Layers

Evaluate Statement (3): Ileum Morphology

Evaluate Statement (4): Vermiform Appendix Origin

360° Option Elimination Engine Key Feature

NTA Trap Alert: Gut Wall Histology: Outside to Inside

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

🔗 Related Questions — Digestion and Absorption

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