Q.193 Zoology ⭐ 360° Option Elimination Active

NEET 2023 Zoology Question 193 Solution

Topic: Excretory Products and their Elimination · Official NTA Booklet Code G5

Question

Which of the following statements are correct? A. An excessive loss of body fluid from the body switches off osmoreceptors. B. ADH facilitates water reabsorption to prevent diuresis. C. ANF causes vasodilation. D. ADH causes increase in blood pressure. E. ADH is responsible for decrease in GFR. Choose the correct answer from the options given below:

(1)C, D and E only
(2)A and B only
(3)B, C and D only
(4)A, B and E only

✓

Verified Against NTA Final Answer Key

Option (3) : B, C and D only

📚 Excretory Products and their Elimination Medium

📋 Given Parameters & Problem Setup

Physiological Systems Osmoreceptors, ADH (Vasopressin), ANF, Blood pressure, and GFR

⚡

The 30-Second Exam Hall Shortcut: ⚡ Osmoreceptor & ADH Error Spotter: A & E are FALSE!

⏱️ Save ~25 seconds

Excess fluid loss ACTIVATES/switches ON osmoreceptors (not off, so A is false!). ADH increases blood pressure which INCREASES GFR (not decrease, so E is false!). B (ADH prevents diuresis), C (ANF causes vasodilation), and D (ADH increases BP) are all TRUE! Select Option (3)!

1 Statement A: Excessive loss of fluid switches off osmoreceptors -> False (Loss of fluid ACTIVATES osmoreceptors).

2 Statement B: ADH facilitates water reabsorption to prevent diuresis -> True.

3 Statement C: ANF causes vasodilation (opposing RAAS) -> True.

4 Statement D: ADH causes vasoconstriction and increases blood pressure -> True.

5 Statement E: ADH decreases GFR -> False (Increase in BP increases glomerular blood flow and GFR).

6 B, C and D only -> Select Option (3).

🛡️

Why You Can 100% Trust This Shortcut: Canonical NCERT Human Physiology renal autoregulation and endocrine control.

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Evaluation of Statements B, C, and D (Valid Statements)

Analyzing the physiological mechanisms governing osmoregulation and blood volume:

\begin{aligned} \text{\textbf{Statement B:}} & \quad \text{ADH inserts aquaporins in DCT/collecting duct } \implies \mathbf{\text{Prevents Diuresis (TRUE)}} \\[4pt] \text{\textbf{Statement C:}} & \quad \text{ANF released by atrial stretch causes } \mathbf{\text{Vasodilation}} \implies \mathbf{\text{Decreases BP (TRUE)}} \\[4pt] \text{\textbf{Statement D:}} & \quad \text{Vasopressin (ADH) constricts arterioles } \implies \mathbf{\text{Increases Blood Pressure (TRUE)}} \end{aligned}

Step 2

Evaluation of Statements A and E (Invalid Statements)

Analyzing the specific contradictions planted in A and E: - Statement A: Osmoreceptors in the hypothalamus are stimulated by an *increase* in blood osmolarity (loss of fluid). Excessive fluid loss switches them ON, not off. Fluid gain switches them off. - Statement E: Because ADH increases systemic blood pressure, it elevates glomerular capillary hydrostatic pressure, thereby increasing (or maintaining) GFR, not decreasing it.

Step 3

Verbatim NCERT References

NCERT states under Regulation of Kidney Function: - "An excessive loss of fluid from the body can activate these receptors which stimulate the hypothalamus to release ADH..." - "ADH facilitates water reabsorption from latter parts of the tubule, thereby preventing diuresis." - "ADH has also constrictory effects on blood vessels. This causes an increase in blood pressure." - "An increase in blood pressure can increase the glomerular blood flow and thereby the GFR." - "ANF can cause vasodilation (dilation of blood vessels) and thereby decrease the blood pressure."

⭐

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:

Includes false statement E (ADH increases, not decreases, GFR).

⚠️

Student Fallacy (Why candidates pick this trap): Assuming vasoconstriction reduces glomerular filtration rate.

2 2

✗ Incorrect

Verdict & Scientific Reason:

Includes false statement A (fluid loss switches on osmoreceptors).

⚠️

Student Fallacy (Why candidates pick this trap): Misreading "switches off" for "switches on" in Statement A.

3 3

✓ 100% Correct

Verdict & Scientific Reason:

Statements B, C, and D are fully verified and accurate NCERT endocrinological principles.

💡

Why this is airtight: None; rigorous physiological discrimination.

4 4

✗ Incorrect

Verdict & Scientific Reason:

Includes both false statements A and E.

⚠️

Student Fallacy (Why candidates pick this trap): Accepting the erroneous osmoreceptor switch and GFR decrease claims.

⚠️

NTA Trap Alert: Osmoreceptor Activation vs. Deactivation Trigger Trap

Loss of body fluid = High blood osmolarity = Osmoreceptors switch ON (stimulated). Influx of water / excessive fluid = Low osmolarity = Osmoreceptors switch OFF.

🛡️ How to avoid the -1 mark: Fluid loss = Osmoreceptors ON. Fluid gain = Osmoreceptors OFF.

📖

Core NEET Syllabus Standard

NCERT Biology · Excretory Products and their Elimination Standard Benchmark

Core Scientific Principle Tested:

"ADH prevents diuresis and increases blood pressure; ANF causes vasodilation. Excessive fluid loss activates osmoreceptors."

Syllabus Focus: Regulation of Kidney Function

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2023 Zoology Question 193 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Osmoreceptor & ADH Error Spotter: A & E are FALSE!

Step-by-Step Rigorous Workflow & Mathematical Proof

Evaluation of Statements B, C, and D (Valid Statements)

Evaluation of Statements A and E (Invalid Statements)

Verbatim NCERT References

360° Option Elimination Engine Key Feature

NTA Trap Alert: Osmoreceptor Activation vs. Deactivation Trigger Trap

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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