It has been mentioned in the historical outline that photosynthesis is dependent on light. The results of ENGELMANN and SACHS showed that it is absorbed by chlorophyll. We also got to know that...
http://www.tvlesson.com/video/27048_light-reaction-of-photosynthesis.html
Plants that are green are the only plants able to produce oxygen and makes food. In which case, the process it undertakes is called photosynthesis. Definitively, physio-chemical process is going on...
http://www.tvlesson.com/video/40989_what-is-photosynthesis.html
