It is the movement of the protoplasm. These are limited to aquatic plants and are free and spontaneous movements.
Examples: Streaming of cytoplasm (cylosis), movement of cilia or flagella, motility of zoospores.
Protoplasmic movements(a) ciliary (b) amoeboid (c) cyclosis (d) gliding
These movements take place due to the difference in the ratio of growth of different parts. It can be further classified as nutational or nastic movements.i) Nutation
Movements as seen in twiners and climbers. This results in curvature and helps in twinning around the support.
ii) Nastic MovementsThese movements are due to differences in the rate of growth on two opposite sides.
Example: opening of the petals and circinately coiled leaves.iii) Movement of Variation
Movement which takes place due to changes in the turgidity of cells.Example: Desmodium gyrans or the telegraph plant. The elliptical up and down movement of the 2 lateral leaflets is due to change in the turgidity of the cell.