Plants use a technique called photomorphogenesis. Photomorphogenesis is the development of form and structure in a plant that is affected by light. This is a response to light that is independent of other light-based responses in the plant, such as photosynthesis. Some examples of photomorphogenesis in plants are their day/night cycles or hourly orientation towards the sun. Changing the day length will change how the flower or leaf orients itself at certain times in the day.
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