Q.159 Zoology ⭐ 360° Option Elimination Active

NEET 2024 Zoology Question 159 Solution

Topic: Human Reproduction · Official NTA Booklet Code T1

Question

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R: Assertion A: FSH acts upon ovarian follicles in female and Leydig cells in male. Reason R: Growing ovarian follicles secrete estrogen in female while interstitial cells secrete androgen in male human being. In the light of the above statements, choose the correct answer from the options given below:

(1)A is true but R is false
(2)A is false but R is true
(3)Both A and R are true and R is the correct explanation of A.
(4)Both A and R are true but R is NOT the correct explanation of A.

✓

Verified Against NTA Final Answer Key

Option (2) : A is false but R is true

📚 Human Reproduction Medium

📋 Given Parameters & Problem Setup

Assertion A FSH acts upon ovarian follicles in female and Leydig cells in male.

Reason R Growing ovarian follicles secrete estrogen in female while interstitial cells secrete androgen in male human being.

⚡

The 30-Second Exam Hall Shortcut: ⚡ Gonadotropin Male Target Trap

⏱️ Save ~25 seconds

LH acts on Leydig cells (L-L) to stimulate androgens! FSH acts on Sertoli cells in males (not Leydig cells!). Assertion A is completely FALSE! Reason R is TRUE!

1 Check Assertion A: In females, FSH stimulates follicular growth. But in males, LH (ICSH) acts on Leydig cells, while FSH acts on Sertoli cells! Assertion A is FALSE!

2 Check Reason R: Growing ovarian follicles secrete estrogen in females, and interstitial (Leydig) cells secrete androgens in males. Reason R is TRUE!

3 A is false but R is true -> Option (2) / B.

🛡️

Why You Can 100% Trust This Shortcut: NCERT Biology · Human Reproduction (Hormonal Control of Male and Female Reproductive Systems)

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Evaluate Assertion A (Target Specificity of FSH and LH)

In males, Luteinizing Hormone (LH) acts at the Leydig cells (interstitial cells) and stimulates synthesis and secretion of androgens. Follicle Stimulating Hormone (FSH) acts on the Sertoli cells and stimulates secretion of some factors which help in the process of spermiogenesis. Claiming FSH acts upon Leydig cells is factually false. Thus, Assertion A is false.

Step 2

Evaluate Reason R (Endocrine Secretions)

Growing ovarian follicles actively synthesize and secrete estrogens in females under FSH stimulation. In males, the interstitial cells of Leydig secrete androgens (principally testosterone). Thus, Reason R is a true statement.

Step 3

Determine Answer Option

Assertion A is false but Reason R is true, matching Option (2).

⭐

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:

Assertion A is false and Reason R is true.

⚠️

Student Fallacy (Why candidates pick this trap): Assertion A is false and Reason R is true.

2 (2)

✓ 100% Correct

Verdict & Scientific Reason:

FSH acts on Sertoli cells (not Leydig cells) in males; follicular estrogen and Leydig androgen secretion are factually correct.

💡

Why this is airtight: None.

3 (3)

✗ Incorrect

Verdict & Scientific Reason:

Assertion A is false.

⚠️

Student Fallacy (Why candidates pick this trap): Assertion A is false.

4 (4)

✗ Incorrect

Verdict & Scientific Reason:

Assertion A is false.

⚠️

Student Fallacy (Why candidates pick this trap): Assertion A is false.

⚠️

NTA Trap Alert: LH vs FSH in Males

Assuming FSH controls all testicular cells or controls Leydig cells.

🛡️ How to avoid the -1 mark: Mnemonic: LH = Leydig cells (producing testosterone); FSH = Sertoli cells (nurturing spermiogenesis).

📖

Core NEET Syllabus Standard

Biology Core Zoology · Human Reproduction Standard Benchmark

Core Scientific Principle Tested:

"LH acts at the Leydig cells and stimulates synthesis and secretion of androgens... FSH acts on the Sertoli cells and stimulates secretion of some factors which help in the process of spermiogenesis."

Syllabus Focus: Differential Target Organs of Gonadotropins (LH and FSH)

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2024 Zoology Question 159 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Gonadotropin Male Target Trap

Step-by-Step Rigorous Workflow & Mathematical Proof

Evaluate Assertion A (Target Specificity of FSH and LH)

Evaluate Reason R (Endocrine Secretions)

Determine Answer Option

360° Option Elimination Engine Key Feature

NTA Trap Alert: LH vs FSH in Males

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

🔗 Related Questions — Human Reproduction

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