Botany · Morphology of Flowering Plants

NEET (UG) 2023 — Question 116

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 a modified shoot wherein the shoot apical meristem changes to floral meristem.

Reason (R): Internodes of the shoot get condensed to produce different floral appendages laterally at successive nodes instead of leaves.

In light of the above statements, choose the most appropriate answer from the options given below.

Option A:
Both $\mathbf{A}$ and $\mathbf{R}$ are true but $\mathbf{R}$ is NOT the correct explanation of $\mathbf{A}$ .
Option B:
$\mathbf{A}$ is true but $\mathbf{R}$ is false
Option C:
$\mathbf{A}$ is false but $\mathbf{R}$ is true.
Option D:
Both $\mathbf{A}$ and $\mathbf{R}$ are true and R is the correct explanation of $\mathbf{A}$ .
Correct

Answer: D

Step-by-step solution

A flower is a modified shoot; the shoot apical meristem changes into a floral meristem during flowering. Therefore assertion A is true. In a flower, internodes get condensed (they do not elongate), so the floral axis is shortened. Different floral appendages - sepals, petals, stamens and carpels - arise laterally at successive nodes instead of foliage leaves. Therefore reason R is also true. The condensation of internodes and the lateral production of floral appendages at nodes is the basis for calling the flower a modified shoot. Thus R correctly explains A. Hence the correct option is D.

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Exam: NEET (UG) 2023
Paper: 2023 paper
Subject: Botany
Chapter: Morphology of Flowering Plants
Topic: The Flower

Answer: D

Step-by-step solution

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