Monday, 4 April 2011

2.79

Objective 2.79: understand that plants respond to stimuli


Stimuli is changes in the environment, examples are temperature and light changes.
Plants have receptors to detect stimuli and respond
the  responce is growth.
growth in responce to stimuli is called TROPISM
trpism in responce to:
gravity; geotropism
light; phototropism

the connection between the receptor and the responce usually takes the form of plant hormones, often known as plant growth regulators
an example of this would be AUXIN

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