PLANT MOVEMENTS

Movements are of universal occurrence in plants. Most of the plants are fixed. They can bend only their parts. It is called curvature movement. The locomotory movement of the animal type also occurs among plants. These are shown by free swimming organisms. For example, the ciliated algae like Chlamydomonas and Volvox, many bacteria and the reproductive cells of many algae, bryophytes, pteridophytes and some gymnosperms. In all these cases the entire organism moves from one place to another.

Most of the movements in plants are not rapid. Most rapid movement takes place in sensitive plant (Mimosa pudica). If a terminal leaflet of the plant is touched. All the leaflets at once close down in pairs and the entire leaf drops. The whole process takes a second.

There are two types of plant movements:


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  1. Autonomic movement: The movements induced by some internal causes are called autonomic movement. It example is ciliary movement.
  2. Paratonic movement: The movement induced by external stimuli is called Paratonic movement. Paratonic movement has three types: Tropic movement, nastic movement and tatic movements.

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