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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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Vietnam War. U.S. President Lyndon B. Johnson awards the Distinguished Service Cross to First Lieutenant Marty A. Hammer, during a visit to military personnel, Cam Ranh Bay, South Vietnam, October 26, 1966. President Johnson
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African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.
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The Lost Colony of Roanoke, North Carolina, where 115 people mysteriously disappeared c. 1590. John White discovers the word Croatoan carved onto a tree upon his return to the deserted Roanoke Colony in 1590
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Young boys working in a thread spinning mill in Macon, Georgia, 1909. Boys are so small they have to climb onto the spinning frame to reach and fix broken threads and put back empty bobbins. Child labor. Industrial revolution
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tropism: Related Content

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Photos and Videos

Tropism (Top) Phototropism shown in the multiple exposure of a fungus fruiting body; (bottom) geotropism shown in the multiple exposure of oat coleoptiles.
Examine the role of sunlight and gravity in phototropic and geotropic plant growth
See All Videos and Images →

Related Topics and References

Topics

Key People

Julius von Sachs
German botanist
Jacques Loeb
Jacques Loeb
German biologist

Related Quizzes and Features

Demystified
Plant seedlings emerging from rich fertile soil
Do Plants Feel Pain?