How does a plant respond to light, including through what hormone, and how it does survive as a result of its response? Responses to light are critical for plant survical.  Consider a sprouting plant left in the closet with only a horizontal sliver of sunlight coming in from the crack at the bottom of the door. 

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Plants have multiple hormones which  asist the plant in its daily functions. One hormone which promotes growth is called Cytokinins. This hormone stimulates cell division and stem formation which will make the plant grow taller. Another...

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