Topic: Plant growth regulators: auxin, gibberellin, cytokinin, ethylene, ABA· Plant Physiology

Spraying sugarcane crop with which of the following plant growth regulators, increases the length of stem, thus, increasing the yield?

1. Abscisic acid

2. Auxin

3. Gibberellin

4. Cytokinin

Doubtly Asked 30 Oct 2026 NEET UG 2024 Practice test neet Save WhatsApp Report

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Answer: 3. Gibberellin

Key idea: gibberellins cause stem elongation.

Spraying sugarcane with gibberellin increases internode length, so more stem and more sugar yield. Auxin and cytokinin do not do this, and ABA is a growth inhibitor.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Spraying sugarcane crop with which of the following plant growth regulators, increases the length of stem, thus, increasing the yield?

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