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Gravitropism

Gravitropism

C009/2879

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Credit

MARTIN SHIELDS / SCIENCE PHOTO LIBRARY MARTIN SHIELDS / SCIENCE PHOTO LIBRARY

Caption

Corn, Zea mays, seedling recently germinated and illustrating gravitropism (geotropism). The seed was germinated in a sideways orientation and in the dark. Nevertheless, the root is curving and growing downwards (positive gravitropism) and the shoot upwards (negative gravitropism). The emerging plant oriented itself correctly without any cue from the sun - it responded to gravity.

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