Q.121 Botany ⭐ 360° Option Elimination Active

NEET 2025 Botany Question 121 Solution

Topic: Cell: The Unit of Life · Official NTA Booklet Code 45

Question

Match List - I with List - II. List I: A. Centromere; B. Cilium; C. Cristae; D. Cell membrane. List II: I. Mitochondrion; II. Cell division; III. Cell movement; IV. Phospholipid Bilayer. Choose the correct answer from the options given below:

✓

Verified Against NTA Final Answer Key

Option (4) : A-II, B-III, C-I, D-IV

📚 Cell: The Unit of Life Easy

📋 Given Parameters & Problem Setup

List - I (Cellular Structures) A. Centromere, B. Cilium, C. Cristae, D. Cell membrane

List - II (Associations / Functions) I. Mitochondrion, II. Cell division, III. Cell movement, IV. Phospholipid Bilayer

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The 30-Second Exam Hall Shortcut: ⚡ Cell Biology Match Fingerprint

⏱️ Save ~30 seconds

Centromere = Spindle attachment in Cell division (II); Cilium = 9+2 axoneme for Cell movement (III); Cristae = Infoldings of Mitochondrion (I); Cell membrane = Phospholipid Bilayer (IV)!

1 Perform instant one-to-one pairings from NCERT:

2 - Centromere: Primary constriction holding sister chromatids; kinetochores attach spindle fibres during Cell division (A -> II).

3 - Cilium: Microtubular hair-like projection causing locomotion of cell or fluid (B -> III).

4 - Cristae: Shelf-like infoldings of inner mitochondrial membrane increasing surface area in Mitochondrion (C -> I).

5 - Cell membrane: Singer-Nicolson fluid mosaic model consisting of a Phospholipid Bilayer (D -> IV).

6 Unique combination: A-II, B-III, C-I, D-IV -> Option (4)!

7 Solved in 5 seconds!

🛡️

Why You Can 100% Trust This Shortcut: Eukaryotic Endomembrane System Components (NCERT Biology · Cell: The Unit of Life: ER, Golgi, Lysosomes, Vacuoles).

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Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Anatomy of the Paired Structures

Examine each cellular component and its definitive physiological/structural hallmark:

• A. Centromere: Every chromosome essentially has a primary constriction called the centromere on the sides of which disc-shaped structures called kinetochores are present. These serve as the sites of attachment of spindle fibres during cell division (mitosis and meiosis) to direct chromosome segregation. Hence, A matches II.
• B. Cilium: Cilia are small hair-like structures which work like oars, causing the movement of either the cell or the surrounding fluid (cell movement/motility). Hence, B matches III.
• C. Cristae: The inner membrane of a mitochondrion forms a number of infoldings called cristae towards the matrix, which increase the surface area for ATP-generating electron transport complexes. Hence, C matches I.
• D. Cell membrane: The basic framework of the plasma membrane is a quasi-fluid bimolecular layer of amphipathic phospholipids (phospholipid bilayer) with embedded proteins. Hence, D matches IV.

Step 2

Assembling the Matching Matrix

Combining the verified associations:

• A -> II (Cell division)
• B -> III (Cell movement)
• C -> I (Mitochondrion)
• D -> IV (Phospholipid Bilayer)

Step 3

Conclusion

The correct matching option is A-II, B-III, C-I, D-IV, exactly matching Option (4).

\text{Matching: } A\text{-II}, \; B\text{-III}, \; C\text{-I}, \; D\text{-IV}

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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 A

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Assigns mitochondrion to centromere and cell division to cilium.

⚠️

Student Fallacy (Why candidates pick this trap): Complete confusion between organellar terms.

2 B

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Links cilium to mitochondrion and cristae to phospholipid bilayer.

⚠️

Student Fallacy (Why candidates pick this trap): Misassigning cristae to membrane lipids.

3 C

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Links centromere to phospholipid bilayer and cell membrane to mitochondrion.

⚠️

Student Fallacy (Why candidates pick this trap): Gross misalignment of fundamental cell components.

4 D

✓ 100% Correct

Verdict & Scientific Reason:

100% correct. Correctly associates all 4 cellular structures with their textbook characteristics.

💡

Why this is airtight: None; pristine cytology recall.

⚠️

NTA Trap Alert: Cristae vs Cisternae

Do not confuse CRISTAE (infoldings of the inner membrane of mitochondria) with CISTERNAE (flattened disc-shaped sacs of the Golgi apparatus or endoplasmic reticulum)!

🛡️ How to avoid the -1 mark: Cristae = Mitochondria (respiration); Cisternae = Golgi apparatus (packaging).

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Core NEET Syllabus Standard

NEET Biology Core Syllabus · Cell: The Unit of Life Standard Benchmark

Core Scientific Principle Tested:

"Centromere coordinates chromosome segregation during cell division, cilia mediate motility, cristae expand inner mitochondrial membrane area, and cell membranes are phospholipid bilayers."

Syllabus Focus: Cell Organelles · Structure and Function

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

C-Division (Centromere), C-Motion (Cilium), C-Mito (Cristae), C-Bilayer (Cell membrane)!

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← Previous (Q.120) All Botany Questions Grid Next (Q.122) →

Organellar Membrane Specializations: Cristae, Cisternae, Thylakoids, Phospholipids

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NEET 2025 Botany Question 121 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Cell Biology Match Fingerprint

Step-by-Step Rigorous Workflow & Mathematical Proof

Anatomy of the Paired Structures

Assembling the Matching Matrix

Conclusion

360° Option Elimination Engine Key Feature

NTA Trap Alert: Cristae vs Cisternae

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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