Q.116 Botany ⭐ 360° Option Elimination Active

NEET 2021 Botany Question 116 Solution

Topic: Cell: The Unit of Life · Official NTA Booklet Code M1

Question

Match List - I with List - II. (a) Cristae (i) Primary constriction in chromosome (b) Thylakoids (ii) Disc-shaped sacs in Golgi apparatus (c) Centromere (iii) Infoldings in mitochondria (d) Cisternae (iv) Flattened membranous sacs in stroma of plastids List - I List - II Choose the correct answer from the options given below. (a) (b) (c) (d)

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

✓

Verified Against NTA Final Answer Key

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

📚 Cell: The Unit of Life Easy

📋 Given Parameters & Problem Setup

List I (a) Cristae, (b) Thylakoids, (c) Centromere, (d) Cisternae

List II (i) Primary constriction in chromosome, (ii) Disc-shaped sacs in Golgi apparatus, (iii) Infoldings in mitochondria, (iv) Flattened membranous sacs in stroma of plastids

⚡

The 30-Second Exam Hall Shortcut: ⚡ Fast Pairing: Cristae = Mitochondria (iii) & Thylakoids = Plastids (iv)

⏱️ Save ~25 seconds

Cristae are mitochondrial inner membrane infoldings (a-iii); Thylakoids are flattened membranous sacs in chloroplast stroma (b-iv); Centromere is chromosomal primary constriction (c-i); Cisternae are Golgi stacks (d-ii). Look for (a)-(iii), (b)-(iv) $\implies$ Option (3) is unique!

1 Cristae: Infoldings of the inner mitochondrial membrane

\implies

(a)-(iii).

2 Thylakoids: Flattened membranous sacs arranged in stroma of plastids

\implies

(b)-(iv).

3 Centromere: Primary constriction where kinetochores attach

\implies

(c)-(i).

4 Cisternae: Parallel disc-shaped flattened sacs in Golgi apparatus

\implies

(d)-(ii).

5 Match Option (3).

🛡️

Why You Can 100% Trust This Shortcut: Canonical NCERT Cell: The Unit of Life organelle cytology.

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Morphological Matching of Organelle Structures

Analyzing the specific cytological descriptions defined in cell biology:

\begin{aligned} \text{(a) Cristae} & \longleftrightarrow \text{(iii) Infoldings in inner membrane of mitochondria (increase surface area)} \\[3pt] \text{(b) Thylakoids} & \longleftrightarrow \text{(iv) Flattened membranous sacs in the stroma of plastids (chloroplasts)} \\[3pt] \text{(c) Centromere} & \longleftrightarrow \text{(i) Primary constriction held on chromosome} \\[3pt] \text{(d) Cisternae} & \longleftrightarrow \text{(ii) Concentric disc-shaped sacs in Golgi apparatus} \end{aligned}

Step 2

Elimination Process

Matching (a)-(iii) immediately eliminates Options (1), (2), and (4). Verifying (b)-(iv), (c)-(i), and (d)-(ii) confirms Option (3) is 100% uniquely valid.

⭐

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 Cristae with plastids and Thylakoids with mitochondria.

⚠️

Student Fallacy (Why candidates pick this trap): Swapping mitochondrial cristae with plastid thylakoids.

2 2

✗ Incorrect

Verdict & Scientific Reason:

Mismatches Cristae with chromosome centromere.

⚠️

Student Fallacy (Why candidates pick this trap): Confusing primary constriction with cristae.

3 3

✓ 100% Correct

Verdict & Scientific Reason:

All four organelle structures are mapped perfectly to their canonical textbook morphological definitions.

💡

Why this is airtight: None. Accurate pairing.

4 4

✗ Incorrect

Verdict & Scientific Reason:

Confuses Cristae with Golgi cisternae.

⚠️

Student Fallacy (Why candidates pick this trap): Mixing up the phonetically similar terms Cristae and Cisternae.

⚠️

NTA Trap Alert: Cristae vs Cisternae Phonetic Confusion

Cristae and Cisternae sound similar. Cristae are infoldings of mitochondria; Cisternae are flattened stacks of the Golgi apparatus.

🛡️ How to avoid the -1 mark: Mnemonic: Cristae = Crests/Infoldings in Mitochondria; Cisternae = Cisterns/Tanks in Golgi.

📖

Core NEET Syllabus Standard

NEET / NCERT Biology · Cell: The Unit of Life Standard Benchmark

Core Scientific Principle Tested:

"Cristae are mitochondrial inner membrane infoldings; thylakoids are plastid membranous sacs; centromere is chromosomal constriction; cisternae are Golgi sacs."

Syllabus Focus: Mitochondria, Plastids, Golgi Apparatus, and Chromosomes

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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Organellar Membrane Specializations: Cristae, Cisternae, Thylakoids, Phospholipids

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NEET 2021 Botany Question 116 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Fast Pairing: Cristae = Mitochondria (iii) & Thylakoids = Plastids (iv)

Step-by-Step Rigorous Workflow & Mathematical Proof

Morphological Matching of Organelle Structures

Elimination Process

360° Option Elimination Engine Key Feature

NTA Trap Alert: Cristae vs Cisternae Phonetic Confusion

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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