Gravitropism (geotropism)

Gravitropism (geotropism)

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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 shows a turn in its stem which occurred after its pot was tipped over.

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