BIOL-1507EL Chapter Notes - Chapter 38: Growth Factor, Plant Hormone, Acetic Acid
19 Apr 2016
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A group of plant growth substances (often called phytohormones or plant hormones), the most common example being indole. Acetic acid (iaa), responsible for raising the ph around cells, making the cell wall less rigid and allowing elongation. The turning of all or part of an organism in a particular direction in response to an external stimulus. The orientation of a plant or other organism in response to light, either toward the source of light. Any of several plant hormones, such as gibberellic acid, that stimulate stem elongation, seed germination, and other physiological processes. Growth or movement response of a cell or an organism to gravity.
