Class NEET 2026 ALL Q #2002
KNOWLEDGE BASED
APPLY
4 Marks 2026 NTA-RE-NEET-2026 MCQ SINGLE
Which of the following plant growth regulators promotes internode elongation prior to flowering in cabbage?
(A) Ethephon
(B) Abscisic acid
(C) Gibberellin
(D) Indole butyric acid
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Correct Answer: C

AI Tutor Explanation

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Detailed Solution

Step 1: Identify the physiological process

The question refers to the phenomenon of bolting, which is the rapid internode elongation in rosette plants like cabbage and beet just before the reproductive phase (flowering).

Step 2: Analyze the role of Plant Growth Regulators (PGRs)

Gibberellins are known to induce bolting in rosette plants. By applying Gibberellic acid (GA3), the internodes elongate significantly, allowing the plant to flower.

Step 3: Evaluate the options

Option (A) Ethephon is an ethylene source used for fruit ripening. Option (B) Abscisic acid is a growth inhibitor. Option (D) Indole butyric acid is an auxin used for rooting. Therefore, Gibberellin is the correct regulator for internode elongation.

Final Answer: Gibberellin

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Pedagogical Audit
Bloom's Analysis: This is an APPLY question because it requires the student to recall specific physiological functions of plant hormones and apply that knowledge to a specific biological phenomenon (bolting).
Knowledge Dimension: FACTUAL
Justification: The question tests the recall of specific textbook facts regarding the physiological effects of Gibberellins as outlined in the NCERT Biology curriculum.
Syllabus Audit: In the context of NEET, this is classified as KNOWLEDGE (Textbook). This question directly assesses the student's familiarity with the Plant Growth and Development chapter of the Class 11 Biology syllabus.

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