Question

The electrons needed for the oxygen productuon process of the light reactions of photosynthesis are taken from?

Answer 1

I just looked up the equation for the light - dependent reaction and it is as follows: 2H2O + 2NADP+ + 3ADP + 3Pi → O2 + 2NADPH + 3ATP. Look at the oxygen in the reaction and you should see that it comes from one of the molecules on the left side. There's more about light -dependent reactions here:

http://en.wikipedia.org/wiki/Light-dependent_reactions