Q.157 Zoology ⭐ 360° Option Elimination Active

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NEET 2021 Zoology Question 157 Solution

Topic: Reproductive Health · Official NTA Booklet Code M1

Question

Which one of the following is an example of Hormone releasing IUD?

(1)CuT
(2)LNG 20
(3)Cu 7
(4)Multiload 375

✓

Verified Against NTA Final Answer Key

Option (2) : LNG 20

📚 Reproductive Health Easy

📋 Given Parameters & Problem Setup

Candidate Devices (1) CuT, (2) LNG 20, (3) Cu 7, (4) Multiload 375

Target Category Hormone releasing IUD

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The 30-Second Exam Hall Shortcut: ⚡ "LP = Hormone Releasing (LNG-20 & Progestasert)"

⏱️ Save ~20 seconds

NCERT classifies IUDs into: Non-medicated (Lippes loop), Copper-releasing (CuT, Cu7, Multiload 375), and Hormone-releasing (Progestasert, LNG-20). The "Cu" and "Multiload" options are copper-releasing. LNG-20 is the hormone-releasing IUD! Match Option (2) in 5 seconds!

1 Recall IUD categories: Non-medicated = Lippes loop; Copper-releasing = CuT, Cu7, Multiload 375; Hormone-releasing = Progestasert, LNG-20.

2 Inspect options: CuT (copper), LNG 20 (hormone: levonorgestrel), Cu 7 (copper), Multiload 375 (copper).

3 Select Option (2).

🛡️

Why You Can 100% Trust This Shortcut: NCERT Biology · Reproductive Health (Classification of IUDs: Progestasert and LNG-20 are hormone releasing IUDs).

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Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Categorization of Intrauterine Devices (IUDs)

Intrauterine Devices (IUDs) are inserted by doctors into the uterus through the vagina. NCERT divides them into three precise categories: 1. Non-medicated IUDs: Lippes loop 2. Copper-releasing IUDs: CuT, Cu7, Multiload 375 (release copper ions that suppress sperm motility and fertilising capacity) 3. Hormone-releasing IUDs: Progestasert, LNG-20 (make the uterus unsuitable for implantation and the cervix hostile to sperms)

\text{IUDs} = \begin{cases} \textbf{Non-medicated:} & \text{Lippes loop} \\[3pt] \textbf{Copper-releasing:} & \text{CuT, Cu7, Multiload 375} \\[3pt] \textbf{Hormone-releasing:} & \mathbf{Progestasert, LNG-20} \end{cases}

Step 2

Mechanism of LNG-20

LNG-20 contains levonorgestrel (a synthetic progestin) in a reservoir that releases 20 micrograms of hormone daily. It acts locally on the endometrium to prevent decidualization and creates thick cervical mucus, rendering the uterus unreceptive to blastocyst implantation.

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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 1

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. CuT is a copper-releasing IUD that discharges copper ions.

⚠️

Student Fallacy (Why candidates pick this trap): Confusing copper-releasing mechanisms with endocrine hormonal action.

2 2

✓ 100% Correct

Verdict & Scientific Reason:

Correct. LNG-20 releases levonorgestrel (progestin) and is the textbook example of a hormone-releasing IUD.

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Why this is airtight: None. Canonical textbook knowledge.

3 3

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Cu 7 is a copper-releasing IUD shaped like the numeral 7.

⚠️

Student Fallacy (Why candidates pick this trap): Missing the "Cu" designation which denotes elemental copper.

4 4

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Multiload 375 is a copper-bearing device with 375 mm² of copper wire wound on its stem.

⚠️

Student Fallacy (Why candidates pick this trap): Assuming "Multiload" implies multi-hormonal release.

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NTA Trap Alert: Lumping All Non-Barrier Methods as Hormonal

Students frequently assume all intrauterine inserts contain synthetic hormones, overlooking the direct cytotoxic action of copper ions in CuT, Cu7, and Multiload 375.

🛡️ How to avoid the -1 mark: Look for "Cu" = Copper; look for "LNG" (Levonorgestrel) or "Progest" = Hormone.

📖

Core NEET Syllabus Standard

NEET / NCERT Biology · Reproductive Health Standard Benchmark

Core Scientific Principle Tested:

"Hormone releasing IUDs include Progestasert and LNG-20; CuT, Cu7, and Multiload 375 are copper releasing."

Syllabus Focus: Intrauterine Devices (IUDs)

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2021 Zoology Question 157 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ "LP = Hormone Releasing (LNG-20 & Progestasert)"

Step-by-Step Rigorous Workflow & Mathematical Proof

Categorization of Intrauterine Devices (IUDs)

Mechanism of LNG-20

360° Option Elimination Engine Key Feature

NTA Trap Alert: Lumping All Non-Barrier Methods as Hormonal

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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