Tropism are responses by part of a plant toward of away from a stimulus coming from one direction.
The movement is always a growth movement.
Like animals, plants are able to response to their environment, although usually with much slower responses than those of animals.
In general, plants respond to stimuli by
changing their rate or direction of growth. They may grow either towards or
away from a stimulus. These responses are called tropisms.
Two important stimuli for plants are light and gravity.
Shoots normally grow towards light. Roots do not usually respond to light, but a few grow away from it.
Shoots tend to grow away from the pull of gravity, while roots normally grow towards it.
Pictures are taken from: Tropism slideshow
thank you
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