Gravitropism sequence, 2 of 4

Gravitropism sequence, 2 of 4

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Credit: Martin Shields/SCIENCE PHOTO LIBRARY

Caption: Gravitropism in a sunflower, Helianthus annuus, seedling. Gravitropism (sometimes referred to as geotropism) is a plant response to earth's gravitational field. Plant stems (shoots) exhibit negative gravitropism because they respond by growing away from the gravitational attraction. This plant will show a turn in its stem which occurs after its pot was tipped over. Image 2 in a sequence of 4.

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