Q.152 Zoology ⭐ 360° Option Elimination Active

NEET 2024 Zoology Question 152 Solution

Topic: Cell Cycle and Cell Division · Official NTA Booklet Code T1

Question

Match List I (Sub Phases of Prophase I) with List II (Specific characters). List I: A. Diakinesis; B. Pachytene; C. Zygotene; D. Leptotene. List II: I. Synaptonemal complex formation; II. Completion of terminalisation of chiasmata; III. Chromosomes look like thin threads; IV. Appearance of recombination nodules. Choose the correct answer from the options given below:

✓

Verified Against NTA Final Answer Key

Option (1) : A-II, B-IV, C-I, D-III

📚 Cell Cycle and Cell Division Easy

📋 Given Parameters & Problem Setup

List I (Sub-phases of Prophase I) A: Diakinesis; B: Pachytene; C: Zygotene; D: Leptotene

List II (Hallmark Events) I: Synaptonemal complex formation; II: Completion of terminalisation of chiasmata; III: Chromosomes look like thin threads; IV: Appearance of recombination nodules

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The 30-Second Exam Hall Shortcut: ⚡ Prophase I Sequential Landmarks (L-Z-P-D-D)

⏱️ Save ~25 seconds

Leptotene = Thin threads (III); Zygotene = Synaptonemal complex (I); Pachytene = Recombination nodules / crossing over (IV); Diakinesis = Terminalisation of chiasmata (II)! Match: A-II, B-IV, C-I, D-III!

1 A. Diakinesis: Final stage characterized by terminalisation of chiasmata (II).

2 B. Pachytene: Appearance of recombination nodules at sites of crossing over (IV).

3 C. Zygotene: Synapsis accompanied by formation of synaptonemal complex (I).

4 D. Leptotene: Chromatin condenses into long, thin thread-like chromosomes (III).

5 Order: A-II, B-IV, C-I, D-III -> Option (1) / A.

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Why You Can 100% Trust This Shortcut: NCERT Biology · Cell Cycle and Cell Division (Meiosis I Prophase Stages)

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Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Trace Zygotene and Leptotene Features

During leptotene, chromosomes become gradually visible under light microscopy appearing like thin individual threads (D -> III). During zygotene, homologous chromosomes begin pairing (synapsis) accompanied by the formation of the complex structure called synaptonemal complex (C -> I).

Step 2

Trace Pachytene and Diakinesis Features

During pachytene, bivalents show four chromatids and recombination nodules appear at sites where crossing over occurs between non-sister chromatids (B -> IV). The final stage of meiotic prophase I is diakinesis, marked by the completion of terminalisation of chiasmata (A -> II).

Step 3

Assemble Combination

A-II, B-IV, C-I, D-III corresponds to Option (1).

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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)

✓ 100% Correct

Verdict & Scientific Reason:

Accurately pairs all four prophase I stages with their definitive cytological hallmarks.

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Why this is airtight: None.

2 (2)

✗ Incorrect

Verdict & Scientific Reason:

Mismatches Diakinesis with recombination nodules and Leptotene with synaptonemal complex.

⚠️

Student Fallacy (Why candidates pick this trap): Mismatches Diakinesis with recombination nodules and Leptotene with synaptonemal complex.

3 (3)

✗ Incorrect

Verdict & Scientific Reason:

Mismatches Diakinesis with recombination nodules.

⚠️

Student Fallacy (Why candidates pick this trap): Mismatches Diakinesis with recombination nodules.

4 (4)

✗ Incorrect

Verdict & Scientific Reason:

Mismatches Diakinesis with synaptonemal complex.

⚠️

Student Fallacy (Why candidates pick this trap): Mismatches Diakinesis with synaptonemal complex.

⚠️

NTA Trap Alert: Pachytene vs Zygotene Structures

Confusing synaptonemal complex formation (Zygotene) with recombination nodules (Pachytene).

🛡️ How to avoid the -1 mark: Synaptonemal complex forms during Zygotene (synapsis); Recombination nodules appear in Pachytene.

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Core NEET Syllabus Standard

Biology Core Zoology · Cell Cycle and Cell Division Standard Benchmark

Core Scientific Principle Tested:

"During zygotene, chromosomes start pairing together and this process of association is called synapsis... accompanied by formation of synaptonemal complex. Pachytene is characterised by the appearance of recombination nodules. Diakinesis is marked by terminalisation of chiasmata."

Syllabus Focus: Sub-phases of Prophase I: Characteristic Cytological Events

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2024 Zoology Question 152 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Prophase I Sequential Landmarks (L-Z-P-D-D)

Step-by-Step Rigorous Workflow & Mathematical Proof

Trace Zygotene and Leptotene Features

Trace Pachytene and Diakinesis Features

Assemble Combination

360° Option Elimination Engine Key Feature

NTA Trap Alert: Pachytene vs Zygotene Structures

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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