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phototropism
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Definitions of phototropism in various dictionaries:
noun - an orienting response to light
Growth or movement of a sessile organism toward or away from a source of light.
PHOTOTROPISM - Phototropism is the growth of an organism which responds to a light stimulus. It is most often observed in plants, but can also occur in other organ...
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| Possible Dictionary Clues |
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| Growth or movement of a sessile organism toward or away from a source of light. |
| the orientation of a plant or other organism in response to light, either towards the source of light ( ipositive phototropismi ) or away from it ( inegative phototropismi ). |
| an orienting response to light |
| the growth or movement of a plant, or of a particular part of a plant, towards light or away from it |
| Phototropism description |
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| Phototropism is the growth of an organism which responds to a light stimulus. It is most often observed in plants, but can also occur in other organisms such as fungi. The cells on the plant that are farthest from the light have a chemical called auxin that reacts when phototropism occurs. This causes the plant to have elongated cells on the farthest side from the light. Phototropism is one of the many plant tropisms or movements which respond to external stimuli. Growth towards a light source is called positive phototropism, while growth away from light is called negative phototropism (skototropism). Most plant shoots exhibit positive phototropism, and rearrange their chloroplasts in the leaves to maximize photosynthetic energy and promote growth. Roots usually exhibit negative phototropism, although gravitropism may play a larger role in root behavior and growth. Some vine shoot tips exhibit negative phototropism, which allows them to grow towards dark, solid objects and climb them |