A negative tropism is when something is turned away from something else and positive is when it's turned toward something else. For example if a plant grows toward the light it has, negative geotropism and positive phototropism.
Auxin is a hormone that increases the speed of growth
Cytokinins are responsible for cell division or cytokinesis
Gibberellins regulate the growth and influence germination
Ethylene gas is used to force the ripening of fruit.
Phototropism - Tropos means to turn to or away from and photo means light. Therefore photo tropism means to turn towards or away from light
Geotropism- two means earth or ground. Therefore geotropism means to turn towards or away from the ground.
Thigmotropism- thigmotropism means touch, therefore thigmotropism Means to turn towards or away from touch.
Hydrotropism- hydro means water. Therefore hydrotropism means to turn towards or away from touch.
Chemotropism- chemo means chemical therefore chemotropism means to turn towards or away from chemicals.
