Plants, like all living organism, have a biological clock that respond to changes in time. Light and temperature are two of the most important environmental stimuli that influence these changes. An observable response is the “sleeping movement” such as the opening and closing of a flower or the changes in leaf position at night. Using the thermal expansion of bimetallic strip (two metals with different characteristic are joined together by riveting or welding), the strip will bend according to the increase or decrease in temperature.
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