Q.138 Botany ⭐ 360° Option Elimination Active

NEET 2021 Botany Question 138 Solution

Topic: Morphology of Flowering Plants · Official NTA Booklet Code M1

Question

Match Column - I with Column - II. Column - I Column - II (a) (i) Brassicaceae (b) (ii) Liliaceae (c) (iii) Fabaceae (d) (iv) Solanaceae Select the correct answer from the options given below. (a) (b) (c) (d)

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

✓

Verified Against NTA Final Answer Key

Option (1) : (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)

📚 Morphology of Flowering Plants Easy

📋 Given Parameters & Problem Setup

Column I (Formulas) (a) Zygomorphic diadelphous, (b) Actinomorphic pentamerous bicarpellary, (c) Perianth trimerous tricarpellary, (d) Tetradynamous cruciform

Column II (Families) (i) Brassicaceae, (ii) Liliaceae, (iii) Fabaceae, (iv) Solanaceae

⚡

The 30-Second Exam Hall Shortcut: ⚡ Instant Floral Fingerprint Identification!

⏱️ Save ~20 seconds

Vexillary / diadelphous ( $K_{(5)} C_{1+2+(2)} A_{(9)+1}$ ) = Fabaceae (a-iii); Epipetalous pentamerous ( $C_{(5)} A_5$ ) = Solanaceae (b-iv); Perianth ( $P_{(3+3)} A_{3+3}$ ) = Liliaceae (c-ii); Tetradynamous cruciform ( $K_{2+2} C_4 A_{2+4}$ ) = Brassicaceae (d-i)! Matches Option (1)!

1 (a) % indicates zygomorphic;

C_{1+2+(2)} A_{(9)+1} G_1 \implies

Fabaceae (iii).

2 (b)

\oplus

actinomorphic,

K_{(5)} \overbrace{C_{(5)} A}_5 G_{(2)} \implies

Solanaceae (iv).

3 (c) Perianth

P_{(3+3)} \overbrace{A}_{3+3} G_{(3)} \implies

Liliaceae (ii).

4 (d)

K_{2+2} C_4 A_{2+4} G_{(2)} \implies

Brassicaceae (Cruciferae) (i).

5 Match Option (1).

🛡️

Why You Can 100% Trust This Shortcut: Canonical NCERT Morphology of Flowering Plants on Semi-Technical Description of Families.

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Deconstruction of Diagnostic Floral Formulas

Each angiosperm family in the NCERT syllabus possesses unambiguous diagnostic floral characteristics:

\begin{aligned} \text{(a) } \% \; \text{K}_{(5)} \text{C}_{1+2+(2)} \text{A}_{(9)+1} \underline{\text{G}}_1 & \longleftrightarrow \text{\textbf{Fabaceae (Papilionoideae)}} \implies \text{(iii)} \\[4pt] \text{(b) } \oplus \; \text{K}_{(5)} \overbrace{\text{C}_{(5)} \text{A}_5} \underline{\text{G}}_{(2)} & \longleftrightarrow \text{\textbf{Solanaceae (Potato family)}} \implies \text{(iv)} \\[4pt] \text{(c) } \oplus \; \overbrace{\text{P}_{(3+3)} \text{A}_{3+3}} \underline{\text{G}}_{(3)} & \longleftrightarrow \text{\textbf{Liliaceae (Lily family)}} \implies \text{(ii)} \\[4pt] \text{(d) } \oplus \; \text{K}_{2+2} \text{C}_4 \text{A}_{2+4} \underline{\text{G}}_{(2)} & \longleftrightarrow \text{\textbf{Brassicaceae (Mustard family)}} \implies \text{(i)} \end{aligned}

Step 2

Option Alignment

Matching (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i) directly and exclusively points to Option (1).

⭐

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

✓ 100% Correct

Verdict & Scientific Reason:

Exact diagnostic alignment of all 4 botanical family floral formulas.

💡

Why this is airtight: None. Flawless knowledge of floral formulas.

2 2

✗ Incorrect

Verdict & Scientific Reason:

Mismatches Fabaceae with Brassicaceae and Solanaceae with Liliaceae.

⚠️

Student Fallacy (Why candidates pick this trap): Random assignment.

3 3

✗ Incorrect

Verdict & Scientific Reason:

Mismatches Fabaceae with Liliaceae and Solanaceae with Fabaceae.

⚠️

Student Fallacy (Why candidates pick this trap): Confusing monocot perianth with dicot zygomorphy.

4 4

✗ Incorrect

Verdict & Scientific Reason:

Mismatches Fabaceae with Solanaceae and Brassicaceae with Fabaceae.

⚠️

Student Fallacy (Why candidates pick this trap): Conflating pentamerous with papilionaceous symmetry.

⚠️

NTA Trap Alert: Perianth (P) vs Calyx/Corolla (K/C) Distinction

The presence of Perianth (P) immediately identifies the monocot family Liliaceae! Looking for P first saves immense time.

🛡️ How to avoid the -1 mark: Identify

P_{(3+3)} \implies

Liliaceae instantly.

📖

Core NEET Syllabus Standard

NEET / NCERT Biology · Morphology of Flowering Plants Standard Benchmark

Core Scientific Principle Tested:

"Fabaceae exhibits diadelphous papilionaceous corolla; Solanaceae exhibits epipetalous pentamerous flowers; Liliaceae exhibits perianth; Brassicaceae exhibits tetradynamous stamens."

Syllabus Focus: Description of Some Important Families

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2021 Botany Question 138 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Instant Floral Fingerprint Identification!

Step-by-Step Rigorous Workflow & Mathematical Proof

Deconstruction of Diagnostic Floral Formulas

Option Alignment

360° Option Elimination Engine Key Feature

NTA Trap Alert: Perianth (P) vs Calyx/Corolla (K/C) Distinction

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

🔗 Related Questions — Morphology of Flowering Plants

Definition and Patterns of Phyllotaxy (Leaf Arrangement)

Diagnostic Characters of Family Solanaceae (Potato Family)

Types of Placentation in Angiospermic Ovaries

Decoding Floral Symbols: Symmetry (⊕) and Gynoecium Position (G)

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