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heliotropism
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The answer HELIOTROPISM has 0 possible clue(s) in existing crosswords.
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Definitions of heliotropism in various dictionaries:
noun - an orienting response to the sun
Growth or orientation of a sessile organism, especially a plant, toward or away from the light of the sun.
HELIOTROPISM - 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....
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Possible Jeopardy Clues |
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"H":It's the tendency of an organism to bend toward or away from sunlight |
Possible Dictionary Clues |
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Growth or orientation of a sessile organism, especially a plant, toward or away from the light of the sun. |
the directional growth of a plant in response to sunlight. |
an orienting response to the sun |
The directional growth of a plant in response to sunlight. |
Heliotropism description |
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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 l |