Question
Why photosynthesis is known as redox reaction?

Answer

$1.$ Photosynthesis is considered as a redox reaction as it involves both reduction and oxidation reactions.
$2.$ Water is oxidized by the removal of $H_+$ while $CO_2$ is reduced by the addition of $H.$
$3.$ The redox reactions of photosynthesis are necessary for the conversion of light energy into chemical energy.

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