Q.178 Zoology ⭐ 360° Option Elimination Active

NEET 2025 Zoology Question 178 Solution

Topic: Chemical Coordination and Integration · Official NTA Booklet Code 45

Question

Match List - I with List - II. List I: A. Progesterone; B. Relaxin; C. Melanocyte stimulating hormone; D. Catecholamines. List II: I. Pars intermedia; II. Ovary; III. Adrenal Medulla; IV. Corpus luteum. Choose the correct answer from the options given below:

✓

Verified Against NTA Final Answer Key

Option (1) : A-IV, B-II, C-I, D-III

📚 Chemical Coordination and Integration Easy

📋 Given Parameters & Problem Setup

List - I (Hormones) A. Progesterone, B. Relaxin, C. Melanocyte stimulating hormone, D. Catecholamines

List - II (Endocrine Tissues / Glands) I. Pars intermedia, II. Ovary, III. Adrenal Medulla, IV. Corpus luteum

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The 30-Second Exam Hall Shortcut: ⚡ Endocrine Hormone Match Fingerprint

⏱️ Save ~30 seconds

Progesterone = Corpus luteum (IV); Relaxin = Ovary (in later pregnancy, II); MSH = Pars intermedia of pituitary (I); Catecholamines = Adrenal Medulla (III)! Code: A-IV, B-II, C-I, D-III!

1 Match hormones to their canonical endocrine source from NCERT:

2 - Progesterone: Secreted in massive quantities by the Corpus luteum to support pregnancy (A -> IV).

3 - Relaxin: In the later phase of pregnancy, a hormone called relaxin is secreted by the Ovary (B -> II).

4 - Melanocyte stimulating hormone (MSH): Pars intermedia of pituitary secretes only one hormone: MSH (C -> I).

5 - Catecholamines (adrenaline & noradrenaline): Secreted by the Adrenal Medulla (D -> III).

6 Unique combination: A-IV, B-II, C-I, D-III (Option 1)!

7 Solved in under 10 seconds!

🛡️

Why You Can 100% Trust This Shortcut: Human Endocrine Feedback & Menstrual Hormones (NCERT Biology · Chemical Coordination and Integration & Human Reproduction).

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Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Review of Endocrine Sites and Hormonal Secretions

Analyzing each endocrine gland and tissue pairing:

• A. Progesterone: After ovulation, the ruptured Graafian follicle transforms into a temporary yellow endocrine gland called the Corpus luteum. The corpus luteum secretes large amounts of progesterone which is essential for maintenance of the endometrium. Hence, A matches IV.
• B. Relaxin: NCERT Chapter 3 (Section 3.6) explicitly states: "In addition, in the later phase of pregnancy, a hormone called relaxin is also secreted by the ovary." (Relaxin facilitates parturition by loosening pubic symphysis). Hence, B matches II.
• C. Melanocyte stimulating hormone (MSH): The adenohypophysis consists of two portions, pars distalis and pars intermedia. In humans, pars intermedia secretes only one hormone: MSH (which acts on melanocytes to regulate skin pigmentation). Hence, C matches I.
• D. Catecholamines: The Adrenal Medulla secretes adrenaline (epinephrine) and noradrenaline (norepinephrine), commonly designated as catecholamines. Hence, D matches III.

Step 2

Assembling the Matching Matrix

Combining the verified associations:

• A -> IV (Progesterone - Corpus luteum)
• B -> II (Relaxin - Ovary)
• C -> I (Melanocyte stimulating hormone - Pars intermedia)
• D -> III (Catecholamines - Adrenal Medulla)

Step 3

Conclusion

The unambiguous combination is A-IV, B-II, C-I, D-III, exactly matching Option (1).

\text{Matching: } A\text{-IV}, \; B\text{-II}, \; C\text{-I}, \; D\text{-III}

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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

✓ 100% Correct

Verdict & Scientific Reason:

100% correct. Perfectly correlates each hormone with its NCERT canonical glandular source.

💡

Why this is airtight: None; pristine endocrine knowledge.

2 B

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Swaps MSH with catecholamines (MSH is not from adrenal medulla).

⚠️

Student Fallacy (Why candidates pick this trap): Confusing pituitary hormones with adrenal hormones.

3 C

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Swaps ovary and corpus luteum between progesterone and relaxin.

⚠️

Student Fallacy (Why candidates pick this trap): Failing to assign primary progesterone secretion to the corpus luteum.

4 D

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Assigns catecholamines to corpus luteum and progesterone to adrenal medulla.

⚠️

Student Fallacy (Why candidates pick this trap): Random guessing.

⚠️

NTA Trap Alert: Corpus Luteum vs Ovary for Progesterone and Relaxin

NCERT assigns Progesterone specifically to the CORPUS LUTEUM, and notes that in the later phase of pregnancy, Relaxin is secreted by the OVARY. Matching A to IV immediately locks in B to II!

🛡️ How to avoid the -1 mark: Progesterone = Corpus Luteum; Relaxin = Ovary.

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Core NEET Syllabus Standard

NEET Biology Core Syllabus · Chemical Coordination and Integration / Human Reproduction Standard Benchmark

Core Scientific Principle Tested:

"Progesterone is secreted by corpus luteum, relaxin by ovary, MSH by pars intermedia, and catecholamines by adrenal medulla."

Syllabus Focus: Endocrine Glands and Hormones · Ovary, Pituitary, Adrenal

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

Prog = Luteum (IV), Relax = Ovary (II), MSH = Intermedia (I), Cat = Medulla (III)!

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NEET 2025 Zoology Question 178 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Endocrine Hormone Match Fingerprint

Step-by-Step Rigorous Workflow & Mathematical Proof

Review of Endocrine Sites and Hormonal Secretions

Assembling the Matching Matrix

Conclusion

360° Option Elimination Engine Key Feature

NTA Trap Alert: Corpus Luteum vs Ovary for Progesterone and Relaxin

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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