Photosynthesis is a redox reaction. explain.

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Solution

Redox reaction (oxidation-reduction reactions) are marked by the transfer of electrons. During oxidation, a substance tends to lose its electrons whereas, during reduction, a substance tends to gain electrons.
Photosynthesis is a process in which plants containing chlorophyll convert the carbon dioxide into sugars in the presence of sunlight by a set of redox reactions.
Calvin cycle represents a set of reactions which are used to remove electrons from water which are then used to turn carbon dioxide into organic compounds.
Redox reactions during photosynthesis :
It involves two major steps -
The first step is the oxidation in oxygen in water molecule in the presence of light
2H $_{2}$ O $\to$ O $_{2}$ + 4H $^{+}$
The second step is the reduction step where hydrogen ions reduce the carbon in carbondioxide
4H $^{+}$ + CO $_{2}$ $\to$ (CH $_{2}$ O) + H $_{2}$ 0
The net reaction is
CO $_{2}$ + H $_{2}$ O $\to$ (CH $_{2}$ O) + H $_{2}$ O

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