Answer:
Hydrogen ion [H]
Explanation:
overall reaction of photosynthesis is given in this two steps equation .
Firstly, oxygen in water is oxidized by the light energy:
2H2O → O2 + 4 [H.]
[H.] reduces the carbon in CO2:
4 [H.] + CO2 → (CH2O) + H2O
This reaction occurs together, to yeild overall reaction
CO2 + H2O → (CH2O) +O2
Where [H.], the overall reducing agent
