Most plants are green because they have green chloroplasts. These chloroplasts are the main site of photosynthesis within the plant. They absorb sunlight as the plant needs to grow. Plants that dont contain green pigments in the plant usually have less amounts of energy being generated or in alot of cases they arent classified as plants since they contain no chloryphyll.
http://www.youtube.com/watch?v=aAQYpra4aUs
http://www.pa.msu.edu/sciencet/ask_st/081496.html
http://www.youtube.com/watch?v=aAQYpra4aUs
http://www.pa.msu.edu/sciencet/ask_st/081496.html
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