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NEET 2023 Botany Question 112 Solution

Topic: Morphology of Flowering Plants · Official NTA Booklet Code G5

Question

Axile placentation is observed in

(1)China rose, Petunia and Lemon
(2)Mustard, Cucumber and Primrose
(3)China rose, Beans and Lupin
(4)Tomato, Dianthus and Pea

✓

Verified Against NTA Final Answer Key

Option (1) : China rose, Petunia and Lemon

📚 Morphology of Flowering Plants Easy

📋 Given Parameters & Problem Setup

Placentation Type Axile placentation

Anatomy Placenta axial, ovules attached in multilocular ovary

⚡

The 30-Second Exam Hall Shortcut: ⚡ Axile Placentation Mnemonic: "TLC in China Pet"

⏱️ Save ~25 seconds

Axile placentation occurs in multilocular syncarpous ovaries where ovules attach to the central axis: Tomato, Lemon, China rose, and Petunia (Solanaceae)!

1 Axile placentation: China rose, Tomato, Lemon, Petunia.

2 Marginal: Pea, Beans, Lupin (Legumes).

3 Parietal: Mustard, Argemone, Cucumber.

4 Free Central: Dianthus, Primrose.

5 Option (1) groups China rose, Petunia, and Lemon together.

🛡️

Why You Can 100% Trust This Shortcut: Canonical NCERT Angiosperm carpel and placentation classification.

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Definition of Axile Placentation

When the placenta is axial and the ovules are attached to it in a multilocular ovary, the placentation is termed axile:

\text{\textbf{Axile Placentation}} \iff \text{Multilocular syncarpous ovary with ovules attached to central axis}

Step 2

NCERT Examples Analysis Across Options

Reviewing canonical plant examples classified by placentation:

\begin{aligned} \text{\textbf{Axile:}} & \quad \textit{China rose, Tomato, Lemon, Petunia (Solanaceae)} \\[3pt] \text{Marginal:} & \quad \textit{Pea, Beans, Lupin (Fabaceae)} \\[3pt] \text{Parietal:} & \quad \textit{Mustard, Argemone, Cucumber} \\[3pt] \text{Free Central:} & \quad \textit{Dianthus, Primrose} \\[3pt] \text{Basal:} & \quad \textit{Sunflower, Marigold} \end{aligned}

Step 3

Option Cross-Verification

Option (1) contains China rose (Malvaceae), Petunia (Solanaceae), and Lemon (Rutaceae)—all of which possess multilocular ovaries with axile placentation.

⭐

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:

All three plants possess syncarpous multilocular ovaries with axile placentation.

💡

Why this is airtight: None; perfect textbook alignment.

2 2

✗ Incorrect

Verdict & Scientific Reason:

Mustard and Cucumber show parietal placentation; Primrose shows free central placentation.

⚠️

Student Fallacy (Why candidates pick this trap): Confusing parietal peripheral ovule attachment with central axile columns.

3 3

✗ Incorrect

Verdict & Scientific Reason:

Beans and Lupin (Fabaceae) have unilocular ovaries with marginal placentation.

⚠️

Student Fallacy (Why candidates pick this trap): Overlooking that legumes have marginal placentation along the ventral suture.

4 4

✗ Incorrect

Verdict & Scientific Reason:

Tomato is axile, but Dianthus is free central and Pea is marginal.

⚠️

Student Fallacy (Why candidates pick this trap): Failing to eliminate Dianthus (classic free central example).

⚠️

NTA Trap Alert: Free Central vs. Axile Confusion

Both axile and free central feature ovules positioned centrally. However, axile possesses septa dividing the ovary into multiple locules, whereas free central completely lacks septa (unilocular).

🛡️ How to avoid the -1 mark: Axile = Septa present (Lemon, Tomato, Petunia, China rose). Free Central = Septa absent (Dianthus, Primrose).

📖

Core NEET Syllabus Standard

NCERT Biology · Morphology of Flowering Plants Standard Benchmark

Core Scientific Principle Tested:

"When the placenta is axial and the ovules are attached to it in a multilocular ovary, the placentation is said to be axile, as in china rose, tomato and lemon."

Syllabus Focus: Placentation

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2023 Botany Question 112 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Axile Placentation Mnemonic: "TLC in China Pet"

Step-by-Step Rigorous Workflow & Mathematical Proof

Definition of Axile Placentation

NCERT Examples Analysis Across Options

Option Cross-Verification

360° Option Elimination Engine Key Feature

NTA Trap Alert: Free Central vs. Axile Confusion

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

🔗 Related Questions — Morphology of Flowering Plants

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