Q.198 Zoology ⭐ 360° Option Elimination Active

NEET 2024 Zoology Question 198 Solution

Topic: Human Reproduction · Official NTA Booklet Code T1

Question

Identify the correct option (A), (B), (C), (D) with respect to spermatogenesis. GnRH LH (A) L a7 (B) (C) 1 1 Androgens Factors Y Y Formation of spermatids (D)

(1)FSH, Sertoli cells, Leydig cells, spermatogenesis.
(2)ICSH, Leydig cells, Sertoli cells, spermatogenesis.
(3)FSH, Leydig cells, Sertoli cells, spermiogenesis
(4)ICSH, Interstitial cells, Leydig cells, spermiogenesis.

✓

Verified Against NTA Final Answer Key

Option (3) : FSH, Leydig cells, Sertoli cells, spermiogenesis

📚 Human Reproduction Medium

📋 Given Parameters & Problem Setup

Flowchart Hormonal regulation of male spermatogenesis starting from GnRH

Labels to Identify (A), (B), (C), (D)

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The 30-Second Exam Hall Shortcut: ⚡ Male Hormonal Axis Flowchart Lock

⏱️ Save ~30 seconds

GnRH -> LH + (A=FSH). LH -> (B=Leydig cells) -> Androgens. FSH -> (C=Sertoli cells) -> Factors -> (D=spermiogenesis)! Sequence: FSH, Leydig cells, Sertoli cells, spermiogenesis!

1 Analyse the branch under GnRH:

2 - Left branch: LH -> acts on Leydig cells (B) -> secretes Androgens -> spermatogenesis.

3 - Right branch: GnRH stimulates release of FSH (A).

4 - FSH acts on Sertoli cells (C) -> stimulates secretion of factors.

5 - These factors help in the maturation of spermatids into spermatozoa, which is SPERMIOGENESIS (D).

6 Matches: A = FSH, B = Leydig cells, C = Sertoli cells, D = spermiogenesis.

7 Select Option (3) / C.

🛡️

Why You Can 100% Trust This Shortcut: NCERT Biology · Human Reproduction (Hormonal Regulation of Spermatogenesis)

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Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Review the Hypothalamic-Pituitary-Gonadal Axis in Males

Spermatogenesis starts at the age of puberty due to significant increase in the secretion of gonadotropin releasing hormone (GnRH). GnRH acts at the anterior pituitary gland and stimulates secretion of two gonadotropins: luteinizing hormone (LH) and follicle stimulating hormone (FSH, Label A).

Step 2

Trace LH and FSH Target Actions

LH acts at the Leydig cells (interstitial cells, Label B) and stimulates synthesis and secretion of androgens. Androgens, in turn, stimulate the process of spermatogenesis. FSH acts on the Sertoli cells (Label C) and stimulates secretion of some factors.

Step 3

Identify the Terminal Process (D)

The factors secreted by Sertoli cells under FSH influence are required specifically for the transformation of non-motile spermatids into functional spermatozoa, a process termed spermiogenesis (Label D).

⭐

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:

Inverts Leydig and Sertoli cells.

⚠️

Student Fallacy (Why candidates pick this trap): Inverts Leydig and Sertoli cells.

2 (2)

✗ Incorrect

Verdict & Scientific Reason:

ICSH is another name for LH; the other gonadotropin branch is FSH.

⚠️

Student Fallacy (Why candidates pick this trap): ICSH is another name for LH; the other gonadotropin branch is FSH.

3 (3)

✓ 100% Correct

Verdict & Scientific Reason:

Accurately identifies (A) FSH, (B) Leydig cells, (C) Sertoli cells, and (D) spermiogenesis.

💡

Why this is airtight: None.

4 (4)

✗ Incorrect

Verdict & Scientific Reason:

Incorrect gonadotropin and cell identification.

⚠️

Student Fallacy (Why candidates pick this trap): Incorrect gonadotropin and cell identification.

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NTA Trap Alert: Spermatogenesis vs Spermiogenesis

Selecting "spermatogenesis" instead of "spermiogenesis" for step D.

🛡️ How to avoid the -1 mark: NCERT states explicitly: "FSH acts on the Sertoli cells and stimulates secretion of some factors which help in the process of spermiogenesis."

📖

Core NEET Syllabus Standard

Biology Core Zoology · Human Reproduction Standard Benchmark

Core Scientific Principle Tested:

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

Syllabus Focus: Hormonal Control Cascade of Spermatogenesis and Spermiogenesis

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2024 Zoology Question 198 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Male Hormonal Axis Flowchart Lock

Step-by-Step Rigorous Workflow & Mathematical Proof

Review the Hypothalamic-Pituitary-Gonadal Axis in Males

Trace LH and FSH Target Actions

Identify the Terminal Process (D)

360° Option Elimination Engine Key Feature

NTA Trap Alert: Spermatogenesis vs Spermiogenesis

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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