Photoperiodism

Photoperiodism is a biological process used by some plants and animals to know when it is time to do certain things. This process is based on how much sunlight is available. Plants and animals use this light to tell when to go to sleep, when to wake up, when to change colors, or when to start growing. For example, some flowers may bloom when it is summer because they know that there will be more sunlight during that time. Photoperiodism helps some animals and plants keep their lives in balance with the changing seasons.