Q.157 Zoology ⭐ 360° Option Elimination Active

NEET 2024 Zoology Question 157 Solution

Topic: Excretory Products and their Elimination · Official NTA Booklet Code T1

Question

Given below are two statements: Statement I; In the nephron, the descending limb of loop of Henle is impermeable to water and permeable to electrolytes. Statement II: The proximal convoluted tubule is lined by simple columnar brush border epithelium and increases the surface area for reabsorption. In the light of the above statements, choose the correct answer from the options given below:

(1)Statement I is true but Statement II is false
(2)Statement I is false but Statement II is true
(3)Both Statement I and Statement II are true
(4)Both Statement I and Statement II are false

✓

Verified Against NTA Final Answer Key

Option (4) : Both Statement I and Statement II are false

📚 Excretory Products and their Elimination Medium

📋 Given Parameters & Problem Setup

Statement I In the nephron, the descending limb of loop of Henle is impermeable to water and permeable to electrolytes.

Statement II The proximal convoluted tubule is lined by simple columnar brush border epithelium and increases the surface area for reabsorption.

⚡

The 30-Second Exam Hall Shortcut: ⚡ Double-Inversion Nephron Trap

⏱️ Save ~30 seconds

Descending limb is PERMEABLE to water and IMPERMEABLE to electrolytes (Statement I inverted!). PCT is lined by simple CUBOIDAL (not columnar!) brush border epithelium (Statement II false!). Both are false!

1 Check Statement I: Descending limb is permeable to water and almost impermeable to electrolytes. Statement I states the exact opposite -> FALSE.

2 Check Statement II: PCT is lined by simple CUBOIDAL brush border epithelium, which increases surface area for reabsorption. Statement II states "simple columnar" -> FALSE.

3 Both Statement I and Statement II are false -> Option (4) / D.

🛡️

Why You Can 100% Trust This Shortcut: NCERT Biology · Excretory Products and their Elimination (Function of the Tubules)

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Evaluate Statement I (Loop of Henle Permeability)

NCERT explicitly states: "The descending limb of loop of Henle is permeable to water but almost impermeable to electrolytes. This concentrates the filtrate as it moves down." Statement I asserts it is "impermeable to water and permeable to electrolytes" (which is the property of the ascending limb). Thus, Statement I is false.

Step 2

Evaluate Statement II (PCT Epithelial Histology)

NCERT explicitly states: "Proximal Convoluted Tubule (PCT) is lined by simple cuboidal brush border epithelium which increases the surface area for reabsorption." Statement II claims it is lined by "simple columnar brush border epithelium". Thus, Statement II is false.

Step 3

Synthesize Verdict

Both Statement I and Statement II are false, corresponding 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:

Statement I is false regarding descending limb permeability.

⚠️

Student Fallacy (Why candidates pick this trap): Statement I is false regarding descending limb permeability.

2 (2)

✗ Incorrect

Verdict & Scientific Reason:

Statement II is false regarding simple columnar epithelium (it is cuboidal).

⚠️

Student Fallacy (Why candidates pick this trap): Statement II is false regarding simple columnar epithelium (it is cuboidal).

3 (3)

✗ Incorrect

Verdict & Scientific Reason:

Both statements contain deliberate factual errors.

⚠️

Student Fallacy (Why candidates pick this trap): Both statements contain deliberate factual errors.

4 (4)

✓ 100% Correct

Verdict & Scientific Reason:

Accurately recognizes that descending limb permeability was inverted and PCT epithelium is cuboidal, not columnar.

💡

Why this is airtight: None.

⚠️

NTA Trap Alert: Cuboidal vs Columnar Oversight

Seeing "brush border epithelium" in Statement II and automatically marking it true without checking that it says columnar instead of cuboidal.

🛡️ How to avoid the -1 mark: Always check both tissue geometry (cuboidal) and surface specialisation (brush border) in renal histology questions.

📖

Core NEET Syllabus Standard

Biology Core Zoology · Excretory Products and their Elimination Standard Benchmark

Core Scientific Principle Tested:

"PCT is lined by simple cuboidal brush border epithelium which increases the surface area for reabsorption... The descending limb of loop of Henle is permeable to water but almost impermeable to electrolytes."

Syllabus Focus: Henle’s Loop Permeability and PCT Brush Border Epithelium

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

Ready to attempt under real exam pressure?

Test your speed and accuracy in the authentic 200-minute timed NTA simulator.

Launch NEET 2024 CBT Test →

← Previous (Q.156) All Zoology Questions Grid Next (Q.158) →

Spotted a mistake in this solution? Report an error (support@mycompetitiveexams.com)

⚖️ Legal & Fair Dealing Notice: Sourced from publicly released NEET 2024 question papers and NEET answer keys for private study, research, and non-commercial educational practice under Fair Dealing (Section 52(1)(a) of the Indian Copyright Act, 1957). Not affiliated with or endorsed by NTA or NMC.

NEET 2024 Zoology Question 157 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Double-Inversion Nephron Trap

Step-by-Step Rigorous Workflow & Mathematical Proof

Evaluate Statement I (Loop of Henle Permeability)

Evaluate Statement II (PCT Epithelial Histology)

Synthesize Verdict

360° Option Elimination Engine Key Feature

NTA Trap Alert: Cuboidal vs Columnar Oversight

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

🔗 Related Questions — Excretory Products and their Elimination

Henle's Loop Permeability & Counter-Current Mechanism

Substance Transport in PCT (P) and DCT (D) of Nephron

Nephron Types: Cortical vs. Juxtamedullary Nephrons

Regulation of Kidney Function: Osmoreceptors, ADH, and ANF

Solve 4 NEET Questions a Day — One per Subject