Q.121 Botany ⭐ 360° Option Elimination Active

NEET 2024 Botany Question 121 Solution

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

Question

Given below are two statements: Statement I: Chromosomes become gradually visible under light microscope during leptotene stage. Statement II: The begining of diplotene stage is recognized by dissolution of synaptonemal complex. In the light of the above statements, choose the correct answer from the options given below:

✓

Verified Against NTA Final Answer Key

Option (3) : Both Statement I and Statement II are true

📚 Cell Cycle and Cell Division Easy

📋 Given Parameters & Problem Setup

Statement I During leptotene stage, chromosomes become gradually visible under the light microscope.

Statement II The beginning of diplotene is recognized by the dissolution of the synaptonemal complex.

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The 30-Second Exam Hall Shortcut: ⚡ Prophase I Sub-stage Verbatim Match

⏱️ Save ~20 seconds

Both statements are verbatim NCERT lines: Leptotene = chromosomes become visible; Diplotene = dissolution of synaptonemal complex and chiasmata formation!

1 Examine Statement I: Leptotene involves progressive chromatin compaction, making chromosomes gradually visible under light microscopy -> TRUE.

2 Examine Statement II: Diplotene is marked by the dissolution of the synaptonemal complex and separation of homologous chromosomes (except at chiasmata) -> TRUE.

3 Both statements are true -> Option (3) / C.

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

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Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Evaluate Statement I (Leptotene Dynamics)

During leptotene stage, the chromosomes become gradually visible under the light microscope. The compaction of chromosomes continues throughout leptotene. Thus, Statement I is completely true.

Step 2

Evaluate Statement II (Diplotene Dynamics)

The beginning of diplotene is recognized by the dissolution of the synaptonemal complex and the tendency of the recombined homologous chromosomes of the bivalents to separate from each other except at the sites of crossovers (forming X-shaped chiasmata). Thus, Statement II is completely true.

Step 3

Combine Findings

Both Statement I and Statement II are true statements, corresponding to Option (3).

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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:

Statement II is also factually true.

⚠️

Student Fallacy (Why candidates pick this trap): Statement II is also factually true.

2 (2)

✗ Incorrect

Verdict & Scientific Reason:

Statement I is factually true.

⚠️

Student Fallacy (Why candidates pick this trap): Statement I is factually true.

3 (3)

✓ 100% Correct

Verdict & Scientific Reason:

Both statements match verbatim descriptions in NCERT for leptotene and diplotene stages.

💡

Why this is airtight: None.

4 (4)

✗ Incorrect

Verdict & Scientific Reason:

Neither statement is false.

⚠️

Student Fallacy (Why candidates pick this trap): Neither statement is false.

⚠️

NTA Trap Alert: Diakinesis vs Diplotene Chiasmata

Confusing dissolution of the synaptonemal complex (beginning of diplotene) with terminalisation of chiasmata (diakinesis).

🛡️ How to avoid the -1 mark: Synaptonemal complex dissolves in diplotene; chiasmata terminalise in diakinesis.

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Core NEET Syllabus Standard

Biology Core Botany · Cell Cycle and Cell Division Standard Benchmark

Core Scientific Principle Tested:

"During leptotene stage the chromosomes become gradually visible under the light microscope... The beginning of diplotene is recognised by the dissolution of the synaptonemal complex and the tendency of the recombined homologous chromosomes of the bivalents to separate."

Syllabus Focus: Sequential Sub-stages of Prophase I: Leptotene and Diplotene

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2024 Botany Question 121 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Prophase I Sub-stage Verbatim Match

Step-by-Step Rigorous Workflow & Mathematical Proof

Evaluate Statement I (Leptotene Dynamics)

Evaluate Statement II (Diplotene Dynamics)

Combine Findings

360° Option Elimination Engine Key Feature

NTA Trap Alert: Diakinesis vs Diplotene Chiasmata

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

🔗 Related Questions — Cell Cycle and Cell Division

Sequential Phases of the Eukaryotic Cell Cycle

Stages of Meiosis I and Comparison with Mitosis

Function of Spindle Fibers during Mitosis (Chromosome Segregation)

Centromere Splitting in Meiosis

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