Q.128 Botany ⭐ 360° Option Elimination Active
NEET 2026 Botany Question 128 Solution
Topic: Cell Cycle and Cell Division · Official NTA Booklet Code 50
Question
The correct sequence of adult cell cycle phases is ___.
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Verified Against NTA Final Answer Key
Option (3) : G1-S-G2-M
📚 Cell Cycle and Cell Division Easy
📋 Given Parameters & Problem Setup
Process Adult eukaryotic cell cycle
Constituent Phases Gap 1 (G₁), Synthesis (S), Gap 2 (G₂), Mitosis (M)
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⏱️ Save ~40 seconds The 30-Second Exam Hall Shortcut: ⚡ Cell Cycle Order Rule
Interphase (G₁ -> S -> G₂) followed by Division (M)!
1 Recall canonical order of the cell cycle:
2 G₁ phase (post-mitotic gap, cell metabolically active and growing).
3 S phase (DNA replication and centriole duplication).
4 G₂ phase (protein synthesis for spindle assembly).
5 M phase (karyokinesis and cytokinesis).
6 Correct chronological order: G1-S-G2-M.
7 Option (3) is G1-S-G2-M. Pick Option (3) in 3 seconds!
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Why You Can 100% Trust This Shortcut: NCERT Biology · Cell Cycle and Cell Division (Interphase G1, S, G2 phases: DNA replication occurs strictly in S phase).
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Step-by-Step Rigorous Workflow & Mathematical Proof
Step 1
Interphase and its Sub-phases
The cell cycle is divided into two basic phases: Interphase (which occupies over 95% of cycle duration) and M Phase (mitosis). Interphase is divided into three sequential periods: G₁ phase, S phase, and G₂ phase.
- • G₁ (Gap 1): Interval between mitosis and initiation of DNA replication.
- • S (Synthesis): DNA replication doubles DNA content from 2C to 4C while chromosome number remains 2n.
- • G₂ (Gap 2): Proteins are synthesized in preparation for mitosis while cell growth continues.
Step 2
Transition to M Phase
Following G₂, the cell enters the M phase (mitosis), where sister chromatids are partitioned equally into two daughter cells through prophase, metaphase, anaphase, telophase, and cytokinesis.
- • Matches Option (3).
Step 3
Eliminate Other Sequences
Option (1) places G₂ before S (physically impossible as DNA must be copied in S before G₂). Option (2) places M between G₁ and G₂. Option (4) scrambles the sequence completely.
- • Matches official NTA final answer key Option C / (3).
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4-Option Deep Scan
360° Option Elimination Engine Key Feature
Diagnose every choice: Know exactly why the right option works and why distractors fail.
1 A
✗ Incorrect Verdict & Scientific Reason:
Incorrect. Swaps G₂ and S phases.
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Student Fallacy (Why candidates pick this trap): Assuming gap phases occur consecutively before synthesis.
2 B
✗ Incorrect Verdict & Scientific Reason:
Incorrect. Places M phase right after G₁ before DNA synthesis.
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Student Fallacy (Why candidates pick this trap): Scrambled order.
3 C
✓ 100% Correct Verdict & Scientific Reason:
100% accurate. Canonical sequential progression of the eukaryotic cell cycle.
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Why this is airtight: None; fundamental cell biology mastery.
4 D
✗ Incorrect Verdict & Scientific Reason:
Incorrect. Places M directly after S without G₂ preparation.
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Student Fallacy (Why candidates pick this trap): Confusing cell cycle checkpoints.
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NTA Trap Alert: Gap Phase Grouping Fallacy
Beginners sometimes imagine that "Gap 1" and "Gap 2" must happen together (G1-G2-S-M). S phase is the indispensable middle bridge where DNA replicates.
🛡️ How to avoid the -1 mark: Remember: G1 prepares the stage, S copies the page, G2 checks the gauge, M divides the cage!
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Core NEET Syllabus Standard
NEET Biology Core Syllabus · Cell Cycle and Cell Division Standard Benchmark
Core Scientific Principle Tested:
"The eukaryotic cell cycle progresses in an invariant unidirectional sequence: G₁ phase -> S phase -> G₂ phase -> M phase."
Syllabus Focus: Phases of Cell Cycle
✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗
Go Sing Gently, Mother: G1, S, G2, M!
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