Q.146 Botany ⭐ 360° Option Elimination Active

NEET 2023 Botany Question 146 Solution

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

Question

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R: Assertion A: A flower is defined as modified shoot wherein the shoot apical meristem changes to floral meristem. Reason R: Internode of the shoot gets condensed to produce different floral appendages laterally at successive nodes instead of leaves. In the light of the above statements, choose the correct answer from the options given below:

(1)A is false but R is true.
(2)Both A and R are true and R is the correct explanation of A.
(3)Both A and R are true but R is NOT the correct explanation of A.
(4)A is true but R is false.

✓

Verified Against NTA Final Answer Key

Option (2) : Both A and R are true and R is the correct explanation of A.

📚 Morphology of Flowering Plants Medium

📋 Given Parameters & Problem Setup

Assertion (A) A flower is defined as modified shoot wherein shoot apical meristem changes to floral meristem.

Reason (R) Internode of shoot gets condensed to produce different floral appendages laterally at successive nodes instead of leaves.

⚡

The 30-Second Exam Hall Shortcut: ⚡ Goethe's Classic Flower Rule: Flower = Condensed Modified Shoot

⏱️ Save ~25 seconds

Why is a flower morphologically defined as a modified shoot? Because the floral axis (thalamus/receptacle) represents condensed internodes bearing floral appendages (sepals, petals, stamens, carpels) at successive nodes instead of foliage leaves! Both true, R explains A!

1 Assertion: Flower is a modified shoot where shoot apical meristem converts into floral meristem -> True.

2 Reason: Internodes do not elongate/condense, producing floral appendages laterally at successive nodes instead of leaves -> True.

3 Reason provides the precise morphological justification for why a flower is categorized as a shoot.

4 Select Option (2) Both A and R are true and R is the correct explanation of A.

🛡️

Why You Can 100% Trust This Shortcut: Canonical NCERT Morphology of Flowering Plants inflorescence and floral shoot homology.

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Morphological Nature of the Flower

In plant morphology (Goethe's foliar theory), a flower is fundamentally a determinate, modified reproductive shoot:

\text{Shoot Apical Meristem (SAM)} \xrightarrow{\text{Floral induction}} \text{\textbf{Floral Meristem (Determinate growth)}}

Step 2

Verbatim NCERT Explanation

NCERT states under The Inflorescence: "A flower is a modified shoot wherein the shoot apical meristem changes to floral meristem. Internodes do not elongate and the axis gets condensed. The apex produces different kinds of floral appendages laterally at successive nodes instead of leaves."

Step 3

Assertion-Reason Causal Validation

The shoot nature of the flower is proven by the presence of nodes and condensed internodes on the thalamus, and the lateral appendages (sepals, petals, stamens, carpels) being homologous to modified leaves. Therefore, Reason R directly explains Assertion A.

⭐

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:

Assertion is factually true: a flower is definitively a modified shoot.

⚠️

Student Fallacy (Why candidates pick this trap): Thinking flowers are distinct de novo organs unrelated to shoots.

2 2

✓ 100% Correct

Verdict & Scientific Reason:

Both statements are true and Reason provides the exact morphological basis explaining Assertion.

💡

Why this is airtight: None; textbook verbatim alignment.

3 3

✗ Incorrect

Verdict & Scientific Reason:

Condensation of internodes and production of floral appendages at nodes is the exact anatomical definition of a modified shoot; the link is directly causal.

⚠️

Student Fallacy (Why candidates pick this trap): Failing to see that node-internode condensation is the proof of shoot homology.

4 4

✗ Incorrect

Verdict & Scientific Reason:

Reason is factually true according to plant morphology.

⚠️

Student Fallacy (Why candidates pick this trap): Doubting that floral appendages arise at successive nodes.

⚠️

NTA Trap Alert: Determinate Growth vs. Shoot Identity Trap

Students often assume that because flower growth is determinate (it terminates with a pistil), it cannot be considered a shoot. The condensed thalamus with nodes and internodes is the proof of shoot origin.

🛡️ How to avoid the -1 mark: Thalamus = Condensed stem axis. Floral whorls = Modified leaves at successive nodes.

📖

Core NEET Syllabus Standard

NCERT Biology · Morphology of Flowering Plants Standard Benchmark

Core Scientific Principle Tested:

"A flower is a modified shoot wherein the shoot apical meristem changes to floral meristem. Internodes do not elongate and the axis gets condensed, producing floral appendages laterally at successive nodes instead of leaves."

Syllabus Focus: The Inflorescence

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2023 Botany Question 146 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Goethe's Classic Flower Rule: Flower = Condensed Modified Shoot

Step-by-Step Rigorous Workflow & Mathematical Proof

Morphological Nature of the Flower

Verbatim NCERT Explanation

Assertion-Reason Causal Validation

360° Option Elimination Engine Key Feature

NTA Trap Alert: Determinate Growth vs. Shoot Identity Trap

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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