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countable and uncountable, plural heliotropisms
The property of some plants of turning under the influence of light; either positively (towards the light) or negatively (away from the light) quotations examples
As soon as the faintest ray of light reaches a seedling, heliotropism will guide it through any crack in the soil, or through an entangled mass of overlying vegetation; […]
1880 November 6, Charles Darwin, Francis Darwin, chapter XII, in The Power of Movement in Plants, page 555
A field of young sunflowers will slowly rotate from east to west during the course of a sunny day, each leaf seeking out as much sunlight as possible as the sun moves across the sky through an adaptation called heliotropism.
2012, Staff (University of Wisconsin-Madison), Sunflowers inspire more efficient solar power system, R&D Magazine, online