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NEET 2020 Botany Question 5 Solution

Topic: Reproductive Health · Official NTA Booklet Code E1
NEET 2020 Botany Question 5: Embryo Transfer (ET) Procedures: ZIFT and IUT

Question

In which of the following techniques, the embryos are transferred to assist those females who cannot conceive?

  1. (1)ZIFT and IUT
  2. (2)GIFT and ZIFT
  3. (3)ICSI and ZIFT
  4. (4)GIFT and ICSI
✓
Verified Against NTA Final Answer Key
Option (1) : ZIFT and IUT
📚 Reproductive Health Easy
📋 Given Parameters & Problem Setup
Condition Females who cannot conceive
Material Transferred EMBRYOS (In vitro fertilized cleaving zygotes)
Question Objective Identify which ART techniques specifically transfer EMBRYOS
⚡

The 30-Second Exam Hall Shortcut: ⚡ "Embryo Transfer (ET) = ZIFT (<8 cells, Tube) + IUT (>8 cells, Uterus)!"

⏱️ Save ~25 seconds

Embryo Transfer (ET) in test-tube baby programmes consists of two procedures based on blastomere count: ZIFT (Zygote Intra Fallopian Transfer, up to 8 blastomeres into Fallopian tube) and IUT (Intra Uterine Transfer, more than 8 blastomeres into Uterus). GIFT transfers GAMETES, not embryos! Mark Option (1).

1 Note the specific entity being transferred: "EMBRYOS".
2 Identify Embryo Transfer (ET) techniques: - ZIFT: Zygote / embryo up to 8 blastomeres into the fallopian tube. - IUT: Embryos with more than 8 blastomeres into the uterus.
3 Discard options containing GIFT: "G" stands for Gamete (Gamete Intra Fallopian Transfer). Eliminates Options 2 and 4.
4 Discard ICSI: ICSI is a fertilization method (sperm injection), not an embryo transfer procedure.
5 Option (1) contains both embryo transfer methods: ZIFT and IUT.
🛡️
Why You Can 100% Trust This Shortcut: NCERT Biology · Reproductive Health (Infertility & ART: In vitro fertilization (IVF) is followed by embryo transfer (ET). The zygote or early embryo (with up to 8 blastomeres) could then be transferred into the fallopian tube (ZIFT) and embryos with more than 8 blastomeres, into the uterus (IUT), to complete their further development).
📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Classification of Assisted Reproductive Technologies (ART)

When natural conception is blocked, in vitro fertilization (IVF) followed by Embryo Transfer (ET) is employed: - ZIFT (Zygote Intra-Fallopian Transfer): The zygote or early cleaving embryo containing up to 8 blastomeres is transferred directly into the ampullary-isthmic region of the Fallopian tube. - IUT (Intra-Uterine Transfer): Embryos cultured past 8 blastomeres (e.g. morula or early blastocyst stage) are transferred directly into the uterine cavity for implantation. - Both ZIFT and IUT are bona fide embryo transfer techniques designed to assist females unable to conceive naturally.

Embryo Transfer (ET)  ⟹  {ZIFT:Zygote / Embryo ≤8 blastomeres →Fallopian tubeIUT:Embryo >8 blastomeres →Uterine cavity\textbf{Embryo Transfer (ET)} \implies \begin{cases} \mathbf{ZIFT:} & \text{Zygote / Embryo } \le 8 \text{ blastomeres } \to \text{Fallopian tube} \\[4pt] \mathbf{IUT:} & \text{Embryo } > 8 \text{ blastomeres } \to \text{Uterine cavity} \end{cases}
Step 2

Disqualification of Gamete and Injection Techniques

- GIFT (Gamete Intra-Fallopian Transfer): Transfer of an unfertilized ovum (gamete) collected from a donor into the fallopian tube of another female who cannot produce one, but can provide a suitable environment for fertilization. - ICSI (Intra-Cytoplasmic Sperm Injection): A laboratory micro-injection technique where a single sperm is injected directly into the cytoplasm of an ovum to achieve fertilization, not an embryo transfer protocol.

⭐

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:

Correct. Both ZIFT (tube, ≤8 cells) and IUT (uterus, >8 cells) are the two canonical Embryo Transfer (ET) procedures.

💡
Why this is airtight: None. Candidate recognizes the dual modalities of embryo transfer.
2 B
✗ Incorrect
Verdict & Scientific Reason:

Incorrect because GIFT transfers unfertilized gametes (ova), not embryos.

⚠️
Student Fallacy (Why candidates pick this trap): Confusing "G" (Gamete) with "Z" (Zygote).
3 C
✗ Incorrect
Verdict & Scientific Reason:

Incorrect because ICSI is an in vitro micromanipulation fertilization technique, not an embryo transfer technique.

⚠️
Student Fallacy (Why candidates pick this trap): Treating sperm injection as an embryo transfer modality.
4 D
✗ Incorrect
Verdict & Scientific Reason:

Incorrect because neither GIFT (gamete transfer) nor ICSI (sperm injection) transfers embryos.

⚠️
Student Fallacy (Why candidates pick this trap): Lumping all ART acronyms together.
⚠️

NTA Trap Alert: ZIFT vs GIFT Gamete vs Zygote Trap

The first letter defines the material transferred: "G" in GIFT means GAMETE (unfertilized egg); "Z" in ZIFT means ZYGOTE/EMBRYO. Any option pairing GIFT with embryo transfer is automatically incorrect.

🛡️ How to avoid the -1 mark: Remember: G = Gamete; Z = Zygote/Embryo; IUT = Uterine Embryo.
📖

Core NEET Syllabus Standard

NEET / NCERT Biology · Reproductive Health Standard Benchmark
Core Scientific Principle Tested:

"In IVF-ET, embryos are transferred via ZIFT (into fallopian tube) or IUT (into uterus)."

Syllabus Focus: Assisted Reproductive Technologies
✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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