Sepal
The sepal of the flower is the outermost whorl. It is green due to the chlorophyll in the plant. The sepal encloses the petals of the plant until the flower blooms. The petals need to be protected so they can attract insects and other animals to pollinate the plant. (1)
Citations:
1. "Sepal." Wikipedia. Wikimedia Foundation, 25 Apr. 2012. Web. 25 Apr. 2012. <http://en.wikipedia.org/wiki/Sepal>.
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