Essay on Plant hormones

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Plant hormones are specialized chemical substances produced by plants. They are the main internal factors controlling growth and development. Hormones are produced in one part of a plant and transported to others, where they are effective in very small amounts. Depending on the target tissue, a given hormone may have different effects.
Plant hormones play an integral role in controlling the growth and development of plants. A plant hormone is generally described as an organic compound synthesized in one part of the plant and translocated to another part, where in low concentrations elicits a physiological response.
There are five generally recognized classes of plant hormones; some of the classes are represented by only one compound,
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Auxins usually affect other processes in addition to cell elongation of stem cells but this characteristic is considered critical of all auxins and therefore defines the hormone.
Functions:
1. Stimulates cell elongation
2. Stimulates cell division in the cambium and, in combination with cytokinins in tissue culture
3. Stimulates differentiation of phloem and xylem
4. Stimulates root initiation on stem cuttings
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