Plant Responses to the Environment > 26.1 Pre-quiz
photoperiodism; abscisic acid
gravitropism (geotropism); cytokinin
Changes in ethylene concentrations on the light side of the plant reduces growth rates.
Gibberellins stimulate growth on the illuminated side of the shoot.
Auxins are found at highest concentrations and stimulate growth on the darker side of the shoot.
Oat coleoptiles exhibit negative phototropism.
geothermal light; phytochrome-red
Earth's rotation; cytokinin
geographic shifting; ethylene