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(a) The total period of growth of a plant or organ, covering the lag phase (slow growth), log phase (rapid growth) and stationary phase (slow growth and then stop), is called the grand period of growth. Plotted against time it gives a sigmoid (S-shaped) curve.

(b) (1) Growth promoters: auxins (IAA), gibberellins (GA3), cytokinins (kinetin). (2) Growth inhibitors: abscisic acid (ABA), ethylene.

Doubtly AI · 28 Oct 2026 AI-verified · Oct 2026 Report
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