Sunflower heliotropism
Timelapse clip of a maturing sunflower (Heliathus annuus) tracking the Sun over several days.
HAGOP S. ATAMIAN, NICKY M. CREUX, AND STACEY L. HARMER
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Encyclopædia Britannica, Inc.Plants' stems grow in the direction of a light source (phototropism), whereas their roots grow downward (geotropism).
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Encyclopædia Britannica, Inc.Plants, ranging from the simple liverwort (a bryophyte) to the flowering plants (angiosperms), have evolved structures enabling them to colonize the land of almost any habitat.
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Video by Neil Bromhall; music, Musopen.org (A Britannica Publishing Partner)Time-lapse video of a sunflower, filmed by Neil Bromhall.
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Encyclopædia Britannica, Inc.Learn about the unusual seed dispersal of the squirting cucumber (Ecballium elaterium).
