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What are plant hormones? Who discovered plant hormone? Name various phytohormones.
Plant hormone or phytohormone: The chemical substances those are produced in one tissue or organs of the plant and sent to other parts for growth and development. These substances are called plant hormones. The word hormone was first of all used by Starling in 1906. J.V. Sach first of all discover plant hormone and called them growth factors. The plant hormone are divided into five groups: � Auxins: Such as indole acetic acid, indol butyric acid. � Gibberellins: Such as GA, GA3. � Cytokinins: Kinetin, zeatin etc. � Abscisic acid: ABA � Ethylene: gaseous hormone.
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