tropism

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Examine the role of sunlight and gravity in phototropic and geotropic plant growth

Tropism (Top) Phototropism shown in the multiple exposure of a fungus fruiting body; (bottom) geotropism shown in the multiple exposure of oat coleoptiles.

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Exploring 7 of Earth’s Great Mountain Ranges

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Estimated battle casualties, Normandy invasion, World War II. WWII, D-Day

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Clouds of smoke rise from fires at the World Trade Center Towers as a result of terrorist attack on September 11, 2001. Photographed 9:54 am in Lower Manhattan.

Timeline of the September 11 Attacks

Close up of books. Stack of books, pile of books, literature, reading. Homepage 2010, arts and entertainment, history and society

12 Novels Considered the “Greatest Book Ever Written”

tropism: Media

biology

Videos

Examine the role of sunlight and gravity in phototropic and geotropic plant growth

Examine the role of sunlight and gravity in phototropic and geotropic plant growth

Plants' stems grow in the direction of a light source (phototropism), whereas their...

Video: Encyclopædia Britannica, Inc.

Images

Tropism (Top) Phototropism shown in the multiple exposure of a fungus fruiting body; (bottom) geotropism shown in the multiple exposure of oat coleoptiles.

Tropism (Top) Phototropism shown in the multiple exposure of a fungus fruiting...

Courtesy of D. Dennison, Dartmouth College, Hanover, N.H.

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