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: '''Phototropism''' can be [[Positive Phototropism]] or [[Negative Phototropism]].
: In the [[Shoot System|shoot system]] of [[plant]]s the [[growth]] is due to [[Positive Phototropism|positive phototropism]] where the [[shoot]]s grow towards the [[light]].
: In the [[Rood Root System|root system]] of [[plant]]s the [[growth]] is due to [[Negative Phototropism|negative phototropism]] where the [[root]]s grow away from the [[light]].