Plant Coordination


PLANT RESPONSE DESCRIPTION
Phototropism Growth towards light
Geotropism Growth of root towards earth's gravity, and growth of shoot away from earth's gravity
Thigmotropism Response to touch (e.g. closing of leaves of Mimosa pudica, ivy vines that cling to walls, trapping of insect by Venus Flytrap)
Elongation of shoots Elongation of cells in stems
Abscission of leaves Falling of leaves particularly in autumn
Photo-periodism Flowering of many plants stimulated by continuous periods of night


Auxins


Cytokinins


Gibberellins


Abscisic Acid


Ethylene


Hormones controlling Photoperiodism