Experiment: Response to Auxin

Experiments showing that a coleoptile lengthens in response to auxin produced in its tip.
Experiments showing that a coleoptile lengthens in response to auxin produced in its tip.


—> time time time —> —> —> A A coleoptile B A block of agar C If an auxin-containing stops growing that absorbs auxin agar block is placed to after its auxin- from a cut tip can one side of a cut tip, producing tip has stimulate a de- the coleoptile will con» been removed. tipped coleoptile tinue to grow, but it will to resume growth. bend as it lengthens.