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#3
Auxin is a plant hormone and it's found in the shoot and roots. It controls the growth of the plant and in shoots it elongates on the shady side causing it to curve towards light
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In general, plant hormones function similarly to animal hormones since they travel from the site of production to act on specific target cells or tissues. They are mostly made in meristematic tissue (growth regions of undifferentiated cells), and can be transported via several methods (diffusion between adjacent cells, transported in phloem etc). The major hormone classes are abscisic acid, ethene, auxins, cytokinins and giberellins - which each have different mechanisms.
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