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heliotropic
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The answer HELIOTROPIC has 1 possible clue(s) in existing crosswords.
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Definitions of heliotropic in various dictionaries:
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Possible Crossword Clues |
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Responding to sunlight |
Last Seen in these Crosswords & Puzzles |
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Aug 6 2011 The Times - Concise |
Possible Dictionary Clues |
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exhibiting heliotropism |
The growth or movement of a fixed organism, especially a plant, toward or away from sunlight. bHeliotropismb can be easily seen in sunflowers, which slowly turn their large flowers so that they continually face the sun. |
Heliotropic might refer to |
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Heliotropism, a form of tropism, is the diurnal motion or seasonal motion of plant parts (flowers or leaves) in response to the direction of the sun. * The habit of some plants to move in the direction of the sun was already known by the Ancient Greeks. They named one of those plants after that property Heliotropium, meaning sun turn. The Greeks assumed it to be a passive effect, presumably the loss of fluid on the illuminated side, that did not need further study. Aristotle's logic that plants are passive and immobile organisms prevailed. In the 19th century, however, botanists discovered that growth processes in the plant were involved, and conducted increasingly ingenious experiments. A. P. de Candolle called this phenomenon in any plant heliotropism (1832). It was renamed phototropism in 1892, because it is a response to light rather than to the sun, and because the phototropism of algae in lab studies at that time strongly depended on the brightness (positive phototropic for weak light, and negative phototropic for bright light, like sunlight). A botanist studying this subject in the lab, at the cellular and subcellular level, or using artificial light, is more likely to employ the more abstract word phototropism. The French scientist Jean-Jacques d'Ortous de Mairan was one of the first to study heliotropism when he experimented with the Mimosa pudica plant. |