Auxin: The Functions, Effects, and Applications of a Plant Growth Hormone By Michael Place. Auxin is the first and most studied plant growth hormone in horticultural study. For the professor or student of a plant science, auxin is a readily accepted term that can be placed to many biological plant functions.nswer: Auxin is a plant growth hormone that can be created chemically or produced biologically by the plant. In biological synthesis, the natural hormone is represented by the symbol IAA, standing for indoleacetic acid.
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