What type of movement is caused by changes in turgor pressure within certain cells?

The type of movement caused by changes in turgor pressure within certain cells is nastic movement. Nastic movements are responses of plants that occur independently of the direction of the stimulus, unlike tropic movements, which are directional.

In nastic movements, cells in specific parts of a plant can gain or lose water, leading to changes in turgor pressure. For example, the rapid opening and closing of flowers or the movements of sensitive plants like Mimosa pudica occur through this mechanism. When cells fill with water, turgor pressure increases, causing parts of the plant to expand or bend. Conversely, when water is lost, turgor pressure decreases, resulting in movements like closing.

This process is crucial for various plant functions, enabling responses to environmental changes without depending on the direction of the stimulus, distinguishing it clearly from other forms of movement, such as passive or directional movements.