People and animals quite obviously have a biorhythm that dictates when they should eat or sleep. But even though it's not as noticeable, plants also have their own internal clocks. A plant's biorhythm, which regulates things such as when it should open or close its flowers, is influenced by sunlight. They know that it's night or day based on their sugar levels, explains Frank Werner from the German Ornamental Plants Association. According to the German News Agency, Sugar is produced by photosynthesis – which plants need sunlight in order to carry out.
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