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Gravitropism
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Description
A Regardless of how a corn seed is oriented in soil, the seedling’s primary root grows down, and its primary shoot grows up.

B These seedlings were rotated 90° counterclockwise after they germinated. They adjusted to the change by redistributing auxin, so their direction of growth shifted.

C In the presence of auxin transport inhibitors, seedlings do not adjust their direc-tion of growth after a 90° counterclockwise rotation. Mutations in genes that encode auxin transport proteins have the same effect.
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