Ethylene is a simple gaseous plant growth regulator (PGR). It is synthesised in large amounts by tissues undergoing senescence and ripening fruits. Influences of ethylene on plants include horizontal growth of seedlings, swelling of the axis and apical hook formation in dicot seedlings. Ethylene promotes senescence and abscission of plant.

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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 root hair formation to increase the absorption surface 4. help overcome apical dominance Recommended PYQs (STRICTLY NCERT Based) Plant Growth and Development Botany NEET Practice Questions.