Photosynthesis and Cellular Respiration Review Sheet

One of the first clues to the mechanism of photosynthesis came from the discovery that the O2 given off by plants comes from H2O, not CO2. Before the 1930s, the prevailing hypothesis was that photosynthesis occurred in two steps: Step 1: CO2 -> C + O2 and Step 2: C + H2O -> CH2O. C.B. van Niel challenged this hypothesis. ................
................