Q.70 Zoology ⭐ 360° Option Elimination Active

NEET 2020 Zoology Question 70 Solution

Topic: Human Reproduction · Official NTA Booklet Code E1

Question

Match the following columns and select the correct option. Column - I Column - II (a) Placenta (i) Androgens (b) Zona pellucida (ii) Human Chorionic Gonadotropin (hCG) (c) Bulbo-urethral (iii) Layer of the ovum glands (d) Leydig cells (iv) Lubrication of the Penis (a) (b) (c) (d)

(1)(iv) (iii) (i) (ii)
(2)(i) (iv) (ii) (iii)
(3)(iii) (ii) (iv) (i)
(4)(ii) (iii) (iv) (i)

✓

Verified Against NTA Final Answer Key

Option (4) : (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)

📚 Human Reproduction Easy

📋 Given Parameters & Problem Setup

Column I (Anatomical Structures) (a) Placenta, (b) Zona pellucida, (c) Bulbo-urethral glands, (d) Leydig cells

Column II (Roles/Products) (i) Androgens, (ii) hCG, (iii) Layer of the ovum, (iv) Lubrication of the penis

⚡

The 30-Second Exam Hall Shortcut: ⚡ "Placenta = hCG; Zona = Ovum coat; Bulbo-urethral = Lubrication; Leydig = Androgens!"

⏱️ 25 seconds

Placenta produces hCG during pregnancy (a->ii). Zona pellucida is the acellular glycoprotein coat of the ovum (b->iii). Bulbo-urethral (Cowper's) glands lubricate the penis (c->iv). Leydig cells secrete androgens/testosterone (d->i). Combination is (ii), (iii), (iv), (i) -> Option 4 in 10 seconds!

1 Placenta acts as an endocrine tissue producing human chorionic gonadotropin (hCG) -> (a)-(ii).

2 Zona pellucida is the primary glycoprotein envelope/layer of the ovum -> (b)-(iii).

3 Bulbo-urethral glands secrete mucus for lubrication of the penis -> (c)-(iv).

4 Leydig (interstitial) cells synthesize and secrete testicular androgens -> (d)-(i).

5 Match: (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i) -> Option 4.

🛡️

Why You Can 100% Trust This Shortcut: NCERT Biology · Human Reproduction (Male & Female Reproductive Systems, Pregnancy)

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Match Placenta

Placenta acts as an endocrine tissue producing hormones essential for maintaining pregnancy, including human chorionic gonadotropin (hCG), human placental lactogen (hPL), estrogens, and progestogens. Thus, (a) matches (ii).

Step 2

Match Zona Pellucida

Zona pellucida is a non-cellular, translucent glycoprotein layer surrounding the mammalian ovum/secondary oocyte, which induces the acrosome reaction upon sperm contact and blocks polyspermy. Thus, (b) matches (iii).

Step 3

Match Bulbo-urethral Glands

Bulbo-urethral (Cowper's) glands are paired male accessory sex glands whose secretions help in the lubrication of the penis during copulation. Thus, (c) matches (iv).

Step 4

Match Leydig Cells

Leydig cells (interstitial cells) are located in the interstitial spaces between seminiferous tubules in the testes; they synthesize and secrete testicular hormones called androgens (primarily testosterone). Thus, (d) matches (i).

⭐

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

✗ Incorrect

Verdict & Scientific Reason:

Incorrect; assigns lubrication of penis to placenta and hCG to Leydig cells.

⚠️

Student Fallacy (Why candidates pick this trap): Gross misalignment of male and female reproductive roles.

2 B

✗ Incorrect

Verdict & Scientific Reason:

Incorrect; claims placenta secretes androgens and zona pellucida lubricates the penis.

⚠️

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

3 C

✗ Incorrect

Verdict & Scientific Reason:

Incorrect; misassigns hCG to zona pellucida and placenta to ovum layer.

⚠️

Student Fallacy (Why candidates pick this trap): Swapping placenta and zona pellucida.

4 D

✓ 100% Correct

Verdict & Scientific Reason:

Accurate pairing across all four reproductive structures and their physiological roles.

💡

Why this is airtight: None; textbook reproductive anatomy.

⚠️

NTA Trap Alert: Male vs Female Accessory Organs

Bulbo-urethral glands (Cowper's) are MALE accessory glands for lubrication. Bartholin's glands are the female counterparts.

🛡️ How to avoid the -1 mark: Remember: Bulbo-urethral = Lubrication of Penis; Leydig = Androgens; Placenta = hCG!

📖

Core NEET Syllabus Standard

Zoology · Human Reproduction Standard Benchmark

Core Scientific Principle Tested:

Syllabus Focus: Functions of Placenta, Zona Pellucida, Bulbo-urethral Glands & Leydig Cells

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2020 Zoology Question 70 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ "Placenta = hCG; Zona = Ovum coat; Bulbo-urethral = Lubrication; Leydig = Androgens!"

Step-by-Step Rigorous Workflow & Mathematical Proof

Match Placenta

Match Zona Pellucida

Match Bulbo-urethral Glands

Match Leydig Cells

360° Option Elimination Engine Key Feature

NTA Trap Alert: Male vs Female Accessory Organs

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

🔗 Related Questions — Human Reproduction

Male vs Female Accessory Ducts and Reproductive Anatomy

Endocrine Regulation of Ovulation (LH Surge) and Corpus Luteum (Progesterone)

Placental Hormones vs. Pituitary Hormones

Secondary Oocyte Envelopes (Zona Pellucida vs Corona Radiata)

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