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 1. Plant hormones regulate plant functions

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PostSubject: 1. Plant hormones regulate plant functions   19/04/09, 10:07 am

a.Hormone: chemical messenger produced in one part of an organism that stimulates or suppresses the activity of cells in another part
i.Direct functions (survival, reproductions)
ii.Response to environment, internal changes

b.Gibberellins
i.Hormones that produce dramatic increase in size
ii.Involved in ending seed dormancy-promote rapid growth

c.Ethylene
i.Hormone that causes ripening
ii.Naturally produced by fruits

d.Cytokinins
i.Hormones that stimulate cytokinesis
ii.Produced in growing roots and developing seeds and fruits
iii.Slow aging process of plant

e.Auxins
i.Hormones involved in the lengthening of plant cells produced in the apical meristem (growing tip)
ii.Prevent growth of new branches
iii.Common to use for herbicides, chemical used to kill plants
iv.Tropism: movement of a plant in response to an environmental stimulus
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Cross Academy :: Honors Biology :: Mrs. St. Clair :: Ch. 22- Plant Growth, Reproduction, and Response :: 22.5- Plant Hormones and Responses-
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