Which equation is correct to prove that comes from water during photosynthesis? 

a) 

b) 

c) 

d) 
Which equation is correct to prove that comes from water during photosynthesis? 

a) 

b) 

c) 

d) 
(d) Ruben and Kamen (1941) and Ruben et al (1941) suspended Chlorella in water having nonradioactive heavy isotope of oxygen , instead of natural oxygen (). The suspension was illuminated. Oxygen evolved was tested by means of mass spectrometer. It was found to be having isotope, . This is possible only if, oxygen evolved during photosynthesis comes from splitting of water 