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(Science: botany) movement or growth of part of an organism (e.g. A plant shoot) towards (positive phototropism) a source of light, without overall movement of the whole organism. An orienting response to light.The directional [[growth of [[meristems in response to the presence of light and the direction it is coming from. Positive phototropism is a directional growth towards the light while a negative response is the organism moving away from the light.

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