Q.195 Zoology ⭐ 360° Option Elimination Active

NEET 2023 Zoology Question 195 Solution

Topic: Cell Cycle and Cell Division · Official NTA Booklet Code G5

Question

Select the correct statements. A. Tetrad formation is seen during Leptotene. B. During Anaphase, the centromeres split and chromatids separate. C. Terminalization takes place during Pachytene. D. Nucleolus, Golgi complex and ER are reformed during Telophase. E. Crossing over takes place between sister chromatids of homologous chromosome. Choose the correct answer from the options given below:

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Verified Against NTA Final Answer Key

Option (3) : B and D only

📚 Cell Cycle and Cell Division Easy

📋 Given Parameters & Problem Setup

Statements 5 statements (A-E) on meiotic and mitotic events

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The 30-Second Exam Hall Shortcut: ⚡ Mitotic & Meiotic Landmark Filter: B & D are TRUE!

⏱️ Save ~25 seconds

Spot the errors in A, C, and E: Tetrads appear in Zygotene/Pachytene (not Leptotene, A is false). Terminalization occurs in Diakinesis (not Pachytene, C is false). Crossing over occurs between NON-SISTER chromatids (not sister, E is false). Anaphase splits centromeres (B) and Telophase reforms organelles (D)! Match Option (3) B and D only!

1 Statement A: Tetrad in Leptotene -> False (Leptotene is compaction; tetrads seen in Zygotene/Pachytene).

2 Statement B: Anaphase centromeres split and chromatids separate -> True.

3 Statement C: Terminalization in Pachytene -> False (Pachytene is crossing over; terminalization is Diakinesis).

4 Statement D: Nucleolus, Golgi, ER reform in Telophase -> True.

5 Statement E: Crossing over between sister chromatids -> False (Between NON-SISTER chromatids of homologous chromosomes).

6 B and D only -> Select Option (3).

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Why You Can 100% Trust This Shortcut: Canonical NCERT Cell Division chromosome dynamics and karyokinetic stages.

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Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Evaluation of Statements B and D (Valid Statements)

Analyzing the mitotic and meiotic cytological events according to NCERT: - Statement B: At the onset of anaphase, each chromosome arranged at the metaphase plate splits simultaneously at its centromere, and sister chromatids separate toward opposite poles. (Statement B is TRUE) - Statement D: Telophase reverses prophase events: chromosomes decondense, the nuclear envelope assembles, and the nucleolus, Golgi complex, and ER reform. (Statement D is TRUE)

\begin{aligned} \text{\textbf{Anaphase:}} & \quad \text{Centromere splits } \longrightarrow \text{Chromatids separate} \implies \mathbf{\text{TRUE (B)}} \\[3pt] \text{\textbf{Telophase:}} & \quad \text{Reformation of Nucleolus, Golgi, and ER} \implies \mathbf{\text{TRUE (D)}} \end{aligned}

Step 2

Evaluation of Statements A, C, and E (Invalid Statements)

Analyzing the specific errors planted in the distractors: - Statement A: Leptotene is characterized by progressive condensation of chromatin. Bivalents/tetrads form during zygotene and are clearly visible as tetrads during pachytene. - Statement C: Terminalization of chiasmata is the defining hallmark of the final stage of prophase I, diakinesis, not pachytene. - Statement E: Crossing over occurs between non-sister chromatids of homologous chromosomes. Recombination between identical sister chromatids would yield no genetic variation.

Step 3

Conclusion

Only Statements B and D are factually correct. Option (3) is the required answer.

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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 E is false because crossing over involves non-sister chromatids.

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Student Fallacy (Why candidates pick this trap): Overlooking the critical word "sister" in Statement E.

2 2

✗ Incorrect

Verdict & Scientific Reason:

Both A (tetrad in leptotene) and C (terminalization in pachytene) are false.

⚠️

Student Fallacy (Why candidates pick this trap): Confusing prophase I sub-stage sequences.

3 3

✓ 100% Correct

Verdict & Scientific Reason:

Both Statements B (anaphase centromere division) and D (telophase organelle reformation) are verbatim NCERT facts.

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Why this is airtight: None; textbook verbatim precision.

4 4

✗ Incorrect

Verdict & Scientific Reason:

All three statements A, C, and E are false.

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Student Fallacy (Why candidates pick this trap): Selecting all the erroneous statements.

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NTA Trap Alert: Sister vs. Non-Sister Chromatid Crossing Over Trap

NTA frequently uses the trap phrase "crossing over between sister chromatids". Recombination between sister chromatids is genetically silent and does not produce recombinants; crossing over MUST occur between non-sister chromatids.

🛡️ How to avoid the -1 mark: Crossing over = Strictly NON-SISTER chromatids of homologous chromosomes.

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Core NEET Syllabus Standard

NCERT Biology · Cell Cycle and Cell Division Standard Benchmark

Core Scientific Principle Tested:

"In anaphase centromeres split and chromatids separate; in telophase nucleolus, Golgi complex and ER reform."

Syllabus Focus: Mitosis and Meiosis Stages

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2023 Zoology Question 195 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Mitotic & Meiotic Landmark Filter: B & D are TRUE!

Step-by-Step Rigorous Workflow & Mathematical Proof

Evaluation of Statements B and D (Valid Statements)

Evaluation of Statements A, C, and E (Invalid Statements)

Conclusion

360° Option Elimination Engine Key Feature

NTA Trap Alert: Sister vs. Non-Sister Chromatid Crossing Over Trap

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

🔗 Related Questions — Cell Cycle and Cell Division

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