Q.149 Botany ⭐ 360° Option Elimination Active

NEET 2021 Botany Question 149 Solution

Topic: Cell Cycle and Cell Division · Official NTA Booklet Code M1

Question

Match List - I with List - II. (a) S phase (i) Proteins are synthesized (b) G2 phase (ii) Inactive phase (c) Quiescent stage (iii) Interval between mitosis and initiation of DNA replication (d) G1 phase (iv) DNA replication List - I List - II Choose the correct answer from the options given below. (a) (b) (c) (d)

(1)(iii) (ii) (i) (iv)
(2)(iv) (ii) (iii) (i)
(3)(iv) (i) (ii) (iii)
(4)(ii) (iv) (iii) (i)

✓

Verified Against NTA Final Answer Key

Option (3) : (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)

📚 Cell Cycle and Cell Division Easy

📋 Given Parameters & Problem Setup

List I (Phases) (a) S phase, (b) G2 phase, (c) Quiescent stage, (d) G1 phase

List II (Events) (i) Proteins are synthesized, (ii) Inactive phase, (iii) Interval between mitosis and initiation of DNA replication, (iv) DNA replication

⚡

The 30-Second Exam Hall Shortcut: ⚡ Fast Cell Cycle Pairing: S = DNA Replication (a-iv) & G0 = Quiescent Inactive (c-ii)

⏱️ Save ~20 seconds

S phase = DNA replication (a-iv); G2 phase = Tubulin/Proteins synthesized for mitosis (b-i); Quiescent stage (G0) = Metabolically active but non-dividing inactive phase (c-ii); G1 phase = Interval between mitosis and DNA replication (d-iii). Gives (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii) $\implies$ Option (3)!

1 (a) S phase (Synthesis phase): DNA replication occurs

\implies

(iv).

2 (b) G2 phase: Proteins (e.g., tubulin) are synthesized in preparation for mitosis

\implies

(i).

3 (c) Quiescent stage (

G_0

): Cells exit cell cycle into an inactive non-proliferative state

\implies

(ii).

4 (d) G1 phase: Interval between mitosis and initiation of DNA replication

\implies

(iii).

5 Match Option (3).

🛡️

Why You Can 100% Trust This Shortcut: Canonical NCERT Cell Cycle and Cell Division on Phases of Cell Cycle.

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Sequential Events in the Eukaryotic Cell Cycle

Interphase represents over 95% of cell cycle duration and is divided into three distinct stages along with the quiescent exit phase:

\begin{aligned} \mathbf{G_1} \text{ phase:} & \quad \text{Interval between mitosis and initiation of DNA replication} \implies \text{(d)-(iii)} \\[4pt] \mathbf{S} \text{ phase:} & \quad \mathbf{\text{DNA replication and doubling of nuclear DNA content } (2C \to 4C)} \implies \text{(a)-(iv)} \\[4pt] \mathbf{G_2} \text{ phase:} & \quad \text{Proteins are synthesized while cell growth continues} \implies \text{(b)-(i)} \\[4pt] \mathbf{G_0} \text{ (Quiescent):} & \quad \text{Cells exit cycle; metabolically active but suspended division (inactive phase)} \implies \text{(c)-(ii)} \end{aligned}

Step 2

Option Alignment

Matching (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii) leads uniquely to Option (3).

⭐

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:

Mismatches S phase with G1 interval and G1 phase with DNA replication.

⚠️

Student Fallacy (Why candidates pick this trap): Inverting S phase and G1 phase.

2 2

✗ Incorrect

Verdict & Scientific Reason:

Mismatches G2 phase with inactive phase and quiescent stage with G1 interval.

⚠️

Student Fallacy (Why candidates pick this trap): Confusing quiescent G0 with G2.

3 3

✓ 100% Correct

Verdict & Scientific Reason:

Exact, canonical assignment of all four cell cycle phases to their NCERT defining features.

💡

Why this is airtight: None. Textbook definition pairing.

4 4

✗ Incorrect

Verdict & Scientific Reason:

Mismatches S phase with inactive phase.

⚠️

Student Fallacy (Why candidates pick this trap): Gross misalignment of interphase stages.

⚠️

NTA Trap Alert: G1 Phase Definition Wording Trap

NCERT defines G1 as: "corresponds to the interval between mitosis and initiation of DNA replication". Memorizing this exact phrasing eliminates doubt instantly.

🛡️ How to avoid the -1 mark: Mitosis

\to

\to

S (DNA replication)

\to

\to

Mitosis.

📖

Core NEET Syllabus Standard

NEET / NCERT Biology · Cell Cycle and Cell Division Standard Benchmark

Core Scientific Principle Tested:

"G1 phase is interval between mitosis and DNA replication. In S phase, DNA replication occurs. In G2 phase, proteins are synthesized. Cells in G0 stage remain metabolically active but inactive in division (quiescent)."

Syllabus Focus: Phases of Cell Cycle: Interphase and G0 Phase

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

Ready to attempt under real exam pressure?

Test your speed and accuracy in the authentic 200-minute timed NTA simulator.

Launch NEET 2021 CBT Test →

← Previous (Q.148) All Botany Questions Grid Next (Q.150) →

Spotted a mistake in this solution? Report an error ([email protected])

⚖️ Legal & Fair Dealing Notice: Sourced from publicly released NEET 2021 question papers and NEET answer keys for private study, research, and non-commercial educational practice under Fair Dealing (Section 52(1)(a) of the Indian Copyright Act, 1957). Not affiliated with or endorsed by NTA or NMC.

NEET 2021 Botany Question 149 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Fast Cell Cycle Pairing: S = DNA Replication (a-iv) & G0 = Quiescent Inactive (c-ii)

Step-by-Step Rigorous Workflow & Mathematical Proof

Sequential Events in the Eukaryotic Cell Cycle

Option Alignment

360° Option Elimination Engine Key Feature

NTA Trap Alert: G1 Phase Definition Wording Trap

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)

Stages of Mitosis: Spindle Fibre Attachment to Kinetochores

Solve 4 NEET Questions a Day — One per Subject