The gaseous plant growth regulator is used in plants to :

1. kill dicotyledonous weeds in the fields

2. speed up the malting process

3. promote root growth and roothair formation to increase the absorption surface

4. help overcome apical dominance

Doubtly Asked 30 Oct 2026 NEET UG 2022 Practice test neet Save WhatsApp Report

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Answer: 3. promote root growth and roothair formation to increase the absorption surface

The gaseous plant growth regulator is ethylene. It promotes root growth and root hair formation, which increases the absorption surface.

Killing dicot weeds is a use of 2,4-D (auxin), speeding up malting is a use of gibberellin, and overcoming apical dominance is a use of cytokinin.

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

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