Q.158 Zoology ⭐ 360° Option Elimination Active

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NEET 2021 Zoology Question 158 Solution

Topic: Digestion and Absorption · Official NTA Booklet Code M1

Question

Succus entericus is referred to as:

(1)Pancreatic juice
(2)Intestinal juice
(3)Gastric juice
(4)Chyme

✓

Verified Against NTA Final Answer Key

Option (2) : Intestinal juice

📚 Digestion and Absorption Easy

📋 Given Parameters & Problem Setup

Term Succus entericus

Candidate Secretions (1) Pancreatic juice, (2) Intestinal juice, (3) Gastric juice, (4) Chyme

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The 30-Second Exam Hall Shortcut: ⚡ "Entericus = Enteron (Intestine) → Succus Entericus = Intestinal Juice"

⏱️ Save ~20 seconds

The Latin root "enteron" refers directly to the intestine. Succus entericus is the canonical anatomical term for intestinal juice produced by goblet cells and crypts of Lieberkühn. Match Option (2) in 3 seconds!

1 Recognize etymology: succus = juice, entericus = enteric/intestinal.

2 Recall NCERT: secretions of the brush border cells of mucosa along with secretions of goblet cells constitute the intestinal juice or succus entericus.

3 Select Option (2).

🛡️

Why You Can 100% Trust This Shortcut: NCERT Biology · Digestion and Absorption (Intestinal juice is referred to as succus entericus, containing disaccharidases, dipeptidases, lipases, nucleosidases).

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Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Definition and Origin of Succus Entericus

The intestinal mucosa contains two major secretory cellular elements: 1. Enterocytes with brush border microvilli: Produce terminal digestive enzymes (maltase, sucrase, lactase, dipeptidases, nucleosidases, intestinal lipases). 2. Goblet cells: Synthesize protective alkaline mucus. The combined secretions of the brush border cells of the mucosa and the secretions of the goblet cells constitute the intestinal juice or succus entericus (pH $\approx 7.8$ ).

\text{Succus Entericus} = \text{Crypts of Lieberkühn Secretion} + \text{Goblet Cell Mucus} = \mathbf{Intestinal\ Juice}

Step 2

Contrast with Competing Digestive Secretions

- Pancreatic juice: Secreted by the exocrine acini of the pancreas, containing trypsinogen, chymotrypsinogen, procarboxypeptidase, pancreatic amylase, and pancreatic lipase. - Gastric juice: Secreted by gastric glands of the stomach, containing HCl, pepsinogen, and intrinsic factor of Castle. - Chyme: The acidic, semi-fluid pulpy mass of partially digested food expelled by the stomach into 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 1

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Pancreatic juice is produced by the pancreas, not intestinal mucosa.

⚠️

Student Fallacy (Why candidates pick this trap): Both fluids enter the duodenum, leading careless students to conflate them.

2 2

✓ 100% Correct

Verdict & Scientific Reason:

Correct. Succus entericus is the canonical synonymous medical term for intestinal juice.

💡

Why this is airtight: None. Direct factual match.

3 3

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Gastric juice refers strictly to stomach secretions.

⚠️

Student Fallacy (Why candidates pick this trap): Confusing enteric (intestinal) with gastric (stomach).

4 4

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Chyme is partially digested food mixed with gastric juice, not a pure glandular secretion.

⚠️

Student Fallacy (Why candidates pick this trap): Equating a digestive fluid with the food bolus undergoing digestion.

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NTA Trap Alert: Bile, Pancreatic Juice, vs Succus Entericus Mix-Up

Questions about duodenal digestion test whether students know which enzymes belong to pancreatic juice versus succus entericus.

🛡️ How to avoid the -1 mark: Pancreatic enzymes end with "-ogen" or are macromolecular degraders (trypsinogen, amylase); Succus entericus enzymes are terminal splitters (dipeptidase, maltase).

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Core NEET Syllabus Standard

NEET / NCERT Biology · Digestion and Absorption Standard Benchmark

Core Scientific Principle Tested:

"The secretions of the brush border cells of the mucosa along with the secretions of the goblet cells constitute the intestinal juice or succus entericus."

Syllabus Focus: Digestive Glands and Secretions

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2021 Zoology Question 158 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ "Entericus = Enteron (Intestine) → Succus Entericus = Intestinal Juice"

Step-by-Step Rigorous Workflow & Mathematical Proof

Definition and Origin of Succus Entericus

Contrast with Competing Digestive Secretions

360° Option Elimination Engine Key Feature

NTA Trap Alert: Bile, Pancreatic Juice, vs Succus Entericus Mix-Up

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

🔗 Related Questions — Digestion and Absorption

Gastrointestinal Valves: Ileo-caecal Valve

Gastric Gland and Hepatic Cell Secretions

Anatomy of Human Alimentary Canal: Small Intestine and Wall Layers

Enzymatic Activation Cascade: Enterokinase and Trypsinogen Activation

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