ENDOGENOUS MOVEMENT
• Is movement that is not known yet its cause certainly but predicted this motion is caused by stimulus that comes from the body of plant itself.
• Examples
- the flowing movement of cytoplasm in cell
- the bending movement of leaf bid because of difference of growth velocity
EXOGENOUS MOVEMENT
• Is plant movement that it is caused by external stimulus
• External stimulus such as : Light, gravity, water, touch, and chemical substance
The various kinds of exogenous movements in plants
1. Tropism movement Is movement of part of plant to stimulus that is movement direction is determined by the stimulus Kinds of tropism phototropism, geotropism, chemotropism, thigmotropism, hydrotropism.
2. Nastic movement Is plant movement to stimulus, that its direction is not determined by stimulus but by plant itself Kind of nastic movement photonasty, Nictinasty, thigmonasty, thermonasty, complex nasty.
3. Taxis movement Is transfer movement of all part to stimulus that its direction is determined by the stimulus. Kinds of taxis movement, phototaxis , chemotaxis.
HYGROSCOPIC MOVEMENT
Is movement of part of plant that is caused by the influence of the change of water level from its cells so happens non-homogenous wrinkling
Example
à the breaking of dried Calanchoe pinnata fruit (cocor bebek)
The opening of sporangium in fern as the cause of wrinkling annulus cells
The opening of sphorangium of moss as the cause of the wrinkling peristome cells
