is a reducing agent in the overall reaction for photosynthesis?

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

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b) mutualism

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