Photonasty
Photonasty is a type of nastic movement in plants where the movement is a response to light. Nastic movements are non-directional responses to stimuli, meaning the direction of the movement is not determined by the direction of the stimulus. In the case of photonasty, the plant moves in response to light, but the movement itself is not directed towards or away from the light source. This is different from phototropism, which is a directional growth response to light.
Photonasty can manifest in various ways. For example, the opening and closing of flowers in response to
Another example of photonasty can be seen in the leaves of some plants. Certain species may orient