Question
Fri July 29, 2011 By:

my question is, do plants have brain? if no then how can they do all their functions, if yes why can't we see it?

Expert Reply
Sat July 30, 2011
No, plants do not have brain. A plant can react and respond to stimuli, such as light, gravity and touch.
Plant shows two types of movements- one dependent on growth and the other independent of growth.
A growth movement of a plant part in response to an external stimulus in which the direction of a stimulus determines the direction of response is called tropism. Thus tropism is a directional movement of the part of a plant caused due to its growth.
In nastic movements the movement of plant part is neither towards the stimulus nor away from the stimulus. This movement is not a directional movement of the plant part with respect to the stimulus.
Different plant hormones help to coordinate growth, development and responses to the environment.
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