What is photnasty?

Photnasty refers to the movement of plants in response to light stimuli, distinct from phototropism, which is growth towards light. It involves rapid, reversible movements that can occur in response to changes in light intensity or direction, allowing plants to optimize their exposure to sunlight. An example of photnasty is the opening and closing of flowers or leaves during the day and night. This phenomenon helps plants manage photosynthesis and conserve resources.